78 lines
2.7 KiB
Java
78 lines
2.7 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.mcteam.factions.gson;
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import org.mcteam.factions.gson.internal.$Gson$Types;
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import java.lang.reflect.Array;
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import java.lang.reflect.Type;
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/**
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* This class contains a mapping of all the application specific
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* {@link InstanceCreator} instances. Registering an {@link InstanceCreator}
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* with this class will override the default object creation that is defined
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* by the ObjectConstructor that this class is wrapping. Using this class
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* with the JSON framework provides the application with "pluggable" modules
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* to customize framework to suit the application's needs.
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*
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* @author Joel Leitch
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*/
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final class MappedObjectConstructor implements ObjectConstructor {
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private static final UnsafeAllocator unsafeAllocator = UnsafeAllocator.create();
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private static final DefaultConstructorAllocator defaultConstructorAllocator =
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new DefaultConstructorAllocator(500);
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private final ParameterizedTypeHandlerMap<InstanceCreator<?>> instanceCreatorMap;
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public MappedObjectConstructor(
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ParameterizedTypeHandlerMap<InstanceCreator<?>> instanceCreators) {
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instanceCreatorMap = instanceCreators;
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}
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@SuppressWarnings("unchecked")
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public <T> T construct(Type typeOfT) {
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InstanceCreator<T> creator = (InstanceCreator<T>) instanceCreatorMap.getHandlerFor(typeOfT);
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if (creator != null) {
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return creator.createInstance(typeOfT);
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}
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return (T) constructWithAllocators(typeOfT);
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}
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public Object constructArray(Type type, int length) {
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return Array.newInstance($Gson$Types.getRawType(type), length);
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}
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@SuppressWarnings({"unchecked", "cast"})
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private <T> T constructWithAllocators(Type typeOfT) {
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try {
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Class<T> clazz = (Class<T>) $Gson$Types.getRawType(typeOfT);
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T obj = defaultConstructorAllocator.newInstance(clazz);
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return (obj == null)
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? unsafeAllocator.newInstance(clazz)
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: obj;
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} catch (Exception e) {
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throw new RuntimeException(("Unable to invoke no-args constructor for " + typeOfT + ". "
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+ "Register an InstanceCreator with Gson for this type may fix this problem."), e);
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}
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}
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@Override
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public String toString() {
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return instanceCreatorMap.toString();
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}
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}
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