614 lines
30 KiB
Java
614 lines
30 KiB
Java
package com.massivecraft.factions.util;
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/**
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* Factions - Developed by Driftay.
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* All rights reserved 2020.
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* Creation Date: 4/4/2020
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*/
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import org.bukkit.Bukkit;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* <b>ReflectionUtils</b>
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* <p>
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* This class provides useful methods which makes dealing with reflection much easier, especially when working with Bukkit
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* <p>
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* You are welcome to use it, modify it and redistribute it under the following conditions:
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* <ul>
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* <li>Don't claim this class as your own
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* <li>Don't remove this disclaimer
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* </ul>
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*
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* <i>It would be nice if you provide credit to me if you use this class in a published project</i>
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*
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* @author DarkBlade12
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* @version 1.1
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*/
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public final class ReflectionUtils {
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// Prevent accidental construction
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private ReflectionUtils() {
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}
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/**
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* Returns the constructor of a given class with the given parameter types
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*
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* @param clazz Target class
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* @param parameterTypes Parameter types of the desired constructor
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* @return The constructor of the target class with the specified parameter types
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* @throws NoSuchMethodException If the desired constructor with the specified parameter types cannot be found
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* @see DataType
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* @see DataType#getPrimitive(Class[])
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* @see DataType#compare(Class[], Class[])
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*/
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public static Constructor<?> getConstructor(Class<?> clazz, Class<?>... parameterTypes) throws NoSuchMethodException {
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Class<?>[] primitiveTypes = DataType.getPrimitive(parameterTypes);
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for (Constructor<?> constructor : clazz.getConstructors()) {
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if (!DataType.compare(DataType.getPrimitive(constructor.getParameterTypes()), primitiveTypes)) {
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continue;
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}
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return constructor;
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}
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throw new NoSuchMethodException("There is no such constructor in this class with the specified parameter types");
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}
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/**
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* Returns the constructor of a desired class with the given parameter types
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*
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param parameterTypes Parameter types of the desired constructor
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* @return The constructor of the desired target class with the specified parameter types
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* @throws NoSuchMethodException If the desired constructor with the specified parameter types cannot be found
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* @throws ClassNotFoundException ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getClass() (String, PackageType)
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* @see #getConstructor(Class, Class...)
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*/
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public static Constructor<?> getConstructor(String className, PackageType packageType, Class<?>... parameterTypes) throws NoSuchMethodException, ClassNotFoundException {
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return getConstructor(packageType.getClass(className), parameterTypes);
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}
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/**
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* Returns an instance of a class with the given arguments
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*
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* @param clazz Target class
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* @param arguments Arguments which are used to construct an object of the target class
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* @return The instance of the target class with the specified arguments
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* @throws InstantiationException If you cannot create an instance of the target class due to certain circumstances
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* @throws IllegalAccessException If the desired constructor cannot be accessed due to certain circumstances
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* @throws IllegalArgumentException If the types of the arguments do not match the parameter types of the constructor (this should not occur since it searches for a constructor with the types of the arguments)
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* @throws InvocationTargetException If the desired constructor cannot be invoked
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* @throws NoSuchMethodException If the desired constructor with the specified arguments cannot be found
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*/
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public static Object instantiateObject(Class<?> clazz, Object... arguments) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException {
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return getConstructor(clazz, DataType.getPrimitive(arguments)).newInstance(arguments);
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}
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/**
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* Returns an instance of a desired class with the given arguments
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*
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param arguments Arguments which are used to construct an object of the desired target class
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* @return The instance of the desired target class with the specified arguments
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* @throws InstantiationException If you cannot create an instance of the desired target class due to certain circumstances
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* @throws IllegalAccessException If the desired constructor cannot be accessed due to certain circumstances
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* @throws IllegalArgumentException If the types of the arguments do not match the parameter types of the constructor (this should not occur since it searches for a constructor with the types of the arguments)
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* @throws InvocationTargetException If the desired constructor cannot be invoked
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* @throws NoSuchMethodException If the desired constructor with the specified arguments cannot be found
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getClass() (String, PackageType)
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* @see #instantiateObject(Class, Object...)
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*/
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public static Object instantiateObject(String className, PackageType packageType, Object... arguments) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, ClassNotFoundException {
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return instantiateObject(packageType.getClass(className), arguments);
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}
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/**
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* Returns a method of a class with the given parameter types
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*
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* @param clazz Target class
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* @param methodName Name of the desired method
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* @param parameterTypes Parameter types of the desired method
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* @return The method of the target class with the specified name and parameter types
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* @throws NoSuchMethodException If the desired method of the target class with the specified name and parameter types cannot be found
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* @see DataType#getPrimitive(Class[])
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* @see DataType#compare(Class[], Class[])
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*/
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public static Method getMethod(Class<?> clazz, String methodName, Class<?>... parameterTypes) throws NoSuchMethodException {
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Class<?>[] primitiveTypes = DataType.getPrimitive(parameterTypes);
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for (Method method : clazz.getMethods()) {
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if (!method.getName().equals(methodName) || !DataType.compare(DataType.getPrimitive(method.getParameterTypes()), primitiveTypes)) {
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continue;
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}
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return method;
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}
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throw new NoSuchMethodException("There is no such method in this class with the specified name and parameter types");
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}
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/**
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* Returns a method of a desired class with the given parameter types
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*
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param methodName Name of the desired method
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* @param parameterTypes Parameter types of the desired method
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* @return The method of the desired target class with the specified name and parameter types
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* @throws NoSuchMethodException If the desired method of the desired target class with the specified name and parameter types cannot be found
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getClass() (String, PackageType)
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* @see #getMethod(Class, String, Class...)
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*/
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public static Method getMethod(String className, PackageType packageType, String methodName, Class<?>... parameterTypes) throws NoSuchMethodException, ClassNotFoundException {
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return getMethod(packageType.getClass(className), methodName, parameterTypes);
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}
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/**
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* Invokes a method on an object with the given arguments
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*
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* @param instance Target object
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* @param methodName Name of the desired method
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* @param arguments Arguments which are used to invoke the desired method
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* @return The result of invoking the desired method on the target object
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* @throws IllegalAccessException If the desired method cannot be accessed due to certain circumstances
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* @throws IllegalArgumentException If the types of the arguments do not match the parameter types of the method (this should not occur since it searches for a method with the types of the arguments)
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* @throws InvocationTargetException If the desired method cannot be invoked on the target object
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* @throws NoSuchMethodException If the desired method of the class of the target object with the specified name and arguments cannot be found
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* @see #getMethod(Class, String, Class...)
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* @see DataType#getPrimitive(Object[])
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*/
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public static Object invokeMethod(Object instance, String methodName, Object... arguments) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException {
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return getMethod(instance.getClass(), methodName, DataType.getPrimitive(arguments)).invoke(instance, arguments);
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}
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/**
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* Invokes a method of the target class on an object with the given arguments
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*
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* @param instance Target object
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* @param clazz Target class
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* @param methodName Name of the desired method
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* @param arguments Arguments which are used to invoke the desired method
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* @return The result of invoking the desired method on the target object
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* @throws IllegalAccessException If the desired method cannot be accessed due to certain circumstances
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* @throws IllegalArgumentException If the types of the arguments do not match the parameter types of the method (this should not occur since it searches for a method with the types of the arguments)
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* @throws InvocationTargetException If the desired method cannot be invoked on the target object
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* @throws NoSuchMethodException If the desired method of the target class with the specified name and arguments cannot be found
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* @see #getMethod(Class, String, Class...)
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* @see DataType#getPrimitive(Object[])
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*/
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public static Object invokeMethod(Object instance, Class<?> clazz, String methodName, Object... arguments) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException {
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return getMethod(clazz, methodName, DataType.getPrimitive(arguments)).invoke(instance, arguments);
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}
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/**
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* Invokes a method of a desired class on an object with the given arguments
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*
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* @param instance Target object
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param methodName Name of the desired method
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* @param arguments Arguments which are used to invoke the desired method
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* @return The result of invoking the desired method on the target object
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* @throws IllegalAccessException If the desired method cannot be accessed due to certain circumstances
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* @throws IllegalArgumentException If the types of the arguments do not match the parameter types of the method (this should not occur since it searches for a method with the types of the arguments)
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* @throws InvocationTargetException If the desired method cannot be invoked on the target object
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* @throws NoSuchMethodException If the desired method of the desired target class with the specified name and arguments cannot be found
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getClass() (String, PackageType)
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* @see #invokeMethod(Object, Class, String, Object...)
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*/
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public static Object invokeMethod(Object instance, String className, PackageType packageType, String methodName, Object... arguments) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, ClassNotFoundException {
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return invokeMethod(instance, packageType.getClass(className), methodName, arguments);
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}
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/**
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* Returns a field of the target class with the given name
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*
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* @param clazz Target class
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @return The field of the target class with the specified name
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* @throws NoSuchFieldException If the desired field of the given class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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*/
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public static Field getField(Class<?> clazz, boolean declared, String fieldName) throws NoSuchFieldException, SecurityException {
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Field field = declared ? clazz.getDeclaredField(fieldName) : clazz.getField(fieldName);
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field.setAccessible(true);
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return field;
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}
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/**
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* Returns a field of a desired class with the given name
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*
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @return The field of the desired target class with the specified name
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* @throws NoSuchFieldException If the desired field of the desired class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getField(Class, boolean, String)
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*/
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public static Field getField(String className, PackageType packageType, boolean declared, String fieldName) throws NoSuchFieldException, SecurityException, ClassNotFoundException {
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return getField(packageType.getClass(className), declared, fieldName);
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}
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/**
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* Returns the value of a field of the given class of an object
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*
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* @param instance Target object
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* @param clazz Target class
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @return The value of field of the target object
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* @throws IllegalArgumentException If the target object does not feature the desired field
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the target class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @see #getField(Class, boolean, String)
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*/
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public static Object getValue(Object instance, Class<?> clazz, boolean declared, String fieldName) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException {
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return getField(clazz, declared, fieldName).get(instance);
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}
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/**
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* Returns the value of a field of a desired class of an object
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*
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* @param instance Target object
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @return The value of field of the target object
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* @throws IllegalArgumentException If the target object does not feature the desired field
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the desired class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #getValue(Object, Class, boolean, String)
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*/
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public static Object getValue(Object instance, String className, PackageType packageType, boolean declared, String fieldName) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, ClassNotFoundException {
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return getValue(instance, packageType.getClass(className), declared, fieldName);
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}
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/**
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* Returns the value of a field with the given name of an object
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*
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* @param instance Target object
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @return The value of field of the target object
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* @throws IllegalArgumentException If the target object does not feature the desired field (should not occur since it searches for a field with the given name in the class of the object)
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the target object cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @see #getValue(Object, Class, boolean, String)
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*/
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public static Object getValue(Object instance, boolean declared, String fieldName) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException {
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return getValue(instance, instance.getClass(), declared, fieldName);
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}
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/**
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* Sets the value of a field of the given class of an object
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*
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* @param instance Target object
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* @param clazz Target class
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @param value New value
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* @throws IllegalArgumentException If the type of the value does not match the type of the desired field
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the target class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @see #getField(Class, boolean, String)
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*/
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public static void setValue(Object instance, Class<?> clazz, boolean declared, String fieldName, Object value) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException {
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getField(clazz, declared, fieldName).set(instance, value);
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}
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/**
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* Sets the value of a field of a desired class of an object
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*
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* @param instance Target object
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* @param className Name of the desired target class
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* @param packageType Package where the desired target class is located
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @param value New value
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* @throws IllegalArgumentException If the type of the value does not match the type of the desired field
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the desired class cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @throws ClassNotFoundException If the desired target class with the specified name and package cannot be found
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* @see #setValue(Object, Class, boolean, String, Object)
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*/
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public static void setValue(Object instance, String className, PackageType packageType, boolean declared, String fieldName, Object value) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, ClassNotFoundException {
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setValue(instance, packageType.getClass(className), declared, fieldName, value);
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}
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/**
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* Sets the value of a field with the given name of an object
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*
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* @param instance Target object
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* @param declared Whether the desired field is declared or not
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* @param fieldName Name of the desired field
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* @param value New value
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* @throws IllegalArgumentException If the type of the value does not match the type of the desired field
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* @throws IllegalAccessException If the desired field cannot be accessed
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* @throws NoSuchFieldException If the desired field of the target object cannot be found
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* @throws SecurityException If the desired field cannot be made accessible
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* @see #setValue(Object, Class, boolean, String, Object)
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*/
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public static void setValue(Object instance, boolean declared, String fieldName, Object value) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException {
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setValue(instance, instance.getClass(), declared, fieldName, value);
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}
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/**
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* Represents an enumeration of dynamic packages of NMS and CraftBukkit
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* <p>
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* This class is part of the <b>ReflectionUtils</b> and follows the same usage conditions
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*
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* @author DarkBlade12
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* @since 1.0
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*/
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public enum PackageType {
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MINECRAFT_SERVER("net.minecraft.server." + getServerVersion()),
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CRAFTBUKKIT("org.bukkit.craftbukkit." + getServerVersion()),
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CRAFTBUKKIT_BLOCK(CRAFTBUKKIT, "block"),
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CRAFTBUKKIT_CHUNKIO(CRAFTBUKKIT, "chunkio"),
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CRAFTBUKKIT_COMMAND(CRAFTBUKKIT, "command"),
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CRAFTBUKKIT_CONVERSATIONS(CRAFTBUKKIT, "conversations"),
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CRAFTBUKKIT_ENCHANTMENS(CRAFTBUKKIT, "enchantments"),
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CRAFTBUKKIT_ENTITY(CRAFTBUKKIT, "entity"),
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CRAFTBUKKIT_EVENT(CRAFTBUKKIT, "event"),
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CRAFTBUKKIT_GENERATOR(CRAFTBUKKIT, "generator"),
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CRAFTBUKKIT_HELP(CRAFTBUKKIT, "help"),
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CRAFTBUKKIT_INVENTORY(CRAFTBUKKIT, "inventory"),
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CRAFTBUKKIT_MAP(CRAFTBUKKIT, "map"),
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CRAFTBUKKIT_METADATA(CRAFTBUKKIT, "metadata"),
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CRAFTBUKKIT_POTION(CRAFTBUKKIT, "potion"),
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CRAFTBUKKIT_PROJECTILES(CRAFTBUKKIT, "projectiles"),
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CRAFTBUKKIT_SCHEDULER(CRAFTBUKKIT, "scheduler"),
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CRAFTBUKKIT_SCOREBOARD(CRAFTBUKKIT, "scoreboard"),
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CRAFTBUKKIT_UPDATER(CRAFTBUKKIT, "updater"),
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CRAFTBUKKIT_UTIL(CRAFTBUKKIT, "util");
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private final String path;
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/**
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* Construct a new package type
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*
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* @param path Path of the package
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*/
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PackageType(String path) {
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this.path = path;
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}
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/**
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* Construct a new package type
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*
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* @param parent Parent package of the package
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* @param path Path of the package
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*/
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PackageType(PackageType parent, String path) {
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this(parent + "." + path);
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}
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/**
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* Returns the version of your server
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*
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* @return The server version
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*/
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public static String getServerVersion() {
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return Bukkit.getServer().getClass().getName().split("\\.")[3];
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}
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/**
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* Returns the path of this package type
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*
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* @return The path
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*/
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public String getPath() {
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return path;
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}
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/**
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* Returns the class with the given name
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*
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* @param className Name of the desired class
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* @return The class with the specified name
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* @throws ClassNotFoundException If the desired class with the specified name and package cannot be found
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*/
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public Class<?> getClass(String className) throws ClassNotFoundException {
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return Class.forName(this + "." + className);
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}
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// Override for convenience
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@Override
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public String toString() {
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return path;
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}
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}
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/**
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* Represents an enumeration of Java data types with corresponding classes
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* <p>
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* This class is part of the <b>ReflectionUtils</b> and follows the same usage conditions
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*
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* @author DarkBlade12
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* @since 1.0
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*/
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public enum DataType {
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BYTE(byte.class, Byte.class),
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SHORT(short.class, Short.class),
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INTEGER(int.class, Integer.class),
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LONG(long.class, Long.class),
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CHARACTER(char.class, Character.class),
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FLOAT(float.class, Float.class),
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DOUBLE(double.class, Double.class),
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BOOLEAN(boolean.class, Boolean.class);
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private static final Map<Class<?>, DataType> CLASS_MAP = new HashMap<>();
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// Initialize map for quick class lookup
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static {
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for (DataType type : values()) {
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CLASS_MAP.put(type.primitive, type);
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CLASS_MAP.put(type.reference, type);
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}
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}
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private final Class<?> primitive;
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private final Class<?> reference;
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/**
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* Construct a new data type
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*
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* @param primitive Primitive class of this data type
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* @param reference Reference class of this data type
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*/
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DataType(Class<?> primitive, Class<?> reference) {
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this.primitive = primitive;
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this.reference = reference;
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}
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/**
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* Returns the data type with the given primitive/reference class
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*
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* @param clazz Primitive/Reference class of the data type
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* @return The data type
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*/
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public static DataType fromClass(Class<?> clazz) {
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return CLASS_MAP.get(clazz);
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}
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/**
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* Returns the primitive class of the data type with the given reference class
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*
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* @param clazz Reference class of the data type
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* @return The primitive class
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*/
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public static Class<?> getPrimitive(Class<?> clazz) {
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DataType type = fromClass(clazz);
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return type == null ? clazz : type.getPrimitive();
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}
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/**
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* Returns the reference class of the data type with the given primitive class
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*
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* @param clazz Primitive class of the data type
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* @return The reference class
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*/
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public static Class<?> getReference(Class<?> clazz) {
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DataType type = fromClass(clazz);
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return type == null ? clazz : type.getReference();
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}
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/**
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* Returns the primitive class array of the given class array
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*
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* @param classes Given class array
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* @return The primitive class array
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*/
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public static Class<?>[] getPrimitive(Class<?>[] classes) {
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int length = classes == null ? 0 : classes.length;
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Class<?>[] types = new Class<?>[length];
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for (int index = 0; index < length; index++) {
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types[index] = getPrimitive(classes[index]);
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}
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return types;
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}
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/**
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* Returns the reference class array of the given class array
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*
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* @param classes Given class array
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* @return The reference class array
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*/
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public static Class<?>[] getReference(Class<?>[] classes) {
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int length = classes == null ? 0 : classes.length;
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Class<?>[] types = new Class<?>[length];
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for (int index = 0; index < length; index++) {
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types[index] = getReference(classes[index]);
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}
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return types;
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}
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/**
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* Returns the primitive class array of the given object array
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*
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* @param objects Given object array
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* @return The primitive class array
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*/
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public static Class<?>[] getPrimitive(Object[] objects) {
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int length = objects == null ? 0 : objects.length;
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Class<?>[] types = new Class<?>[length];
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for (int index = 0; index < length; index++) {
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types[index] = getPrimitive(objects[index].getClass());
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}
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return types;
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}
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/**
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* Returns the reference class array of the given object array
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*
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* @param objects Given object array
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* @return The reference class array
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*/
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public static Class<?>[] getReference(Object[] objects) {
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int length = objects == null ? 0 : objects.length;
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Class<?>[] types = new Class<?>[length];
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for (int index = 0; index < length; index++) {
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types[index] = getReference(objects[index].getClass());
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}
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return types;
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}
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/**
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* Compares two class arrays on equivalence
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*
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* @param primary Primary class array
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* @param secondary Class array which is compared to the primary array
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* @return Whether these arrays are equal or not
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*/
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public static boolean compare(Class<?>[] primary, Class<?>[] secondary) {
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if (primary == null || secondary == null || primary.length != secondary.length) {
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return false;
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}
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for (int index = 0; index < primary.length; index++) {
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Class<?> primaryClass = primary[index];
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Class<?> secondaryClass = secondary[index];
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if (primaryClass.equals(secondaryClass) || primaryClass.isAssignableFrom(secondaryClass)) {
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continue;
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}
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return false;
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}
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return true;
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}
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/**
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* Returns the primitive class of this data type
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*
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* @return The primitive class
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*/
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public Class<?> getPrimitive() {
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return primitive;
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}
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/**
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* Returns the reference class of this data type
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*
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* @return The reference class
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*/
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public Class<?> getReference() {
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return reference;
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}
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}
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}
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