mirror of
https://github.com/PlaceholderAPI/PlaceholderAPI
synced 2024-10-31 19:44:03 +01:00
412 lines
14 KiB
Markdown
412 lines
14 KiB
Markdown
## Overview
|
|
This page covers how you can use the `PlaceholderExpansion` to add own placeholders to PlaceholderAPI, which then can be used by other plugins.
|
|
|
|
PlaceholderAPI is using Expansions for its placeholders, with PlaceholderAPI providing the core. Users can download Expansions from the cloud server using commands in-game or by going [here](https://api.extendedclip.com/home/) if they want to use the placeholder.
|
|
|
|
## Note
|
|
You can either make a separate jar file, to upload it to the expansion-cloud (recommended) or have it as a local class inside your plugin.
|
|
|
|
## Examples
|
|
There are multiple methods and ways you can use the PlaceholderExpansion.
|
|
Those depend on what you want to display through the placeholders in the end.
|
|
|
|
* [Without external plugin](#without-external-plugin)
|
|
* [With external plugin](#with-external-plugin)
|
|
* [Separate jar](#separate-jar)
|
|
* [Internal class](#internal-class)
|
|
|
|
### Without an external plugin
|
|
This part here covers how you create an expansion that doesn't require any external/additional plugins to function.
|
|
Examples of such expansions are:
|
|
- [Player expansion](/PlaceholderAPI/Player-Expansion)
|
|
- [Math expansion](https://github.com/Andre601/Math-Expansion)
|
|
- [Statistics expansion](/PlaceholderAPI/Statistics-Expansion)
|
|
|
|
Since it would be weird (and also make no real sense) to have this inside your plugin, we assume you make a separate jar-file as an expansion.
|
|
|
|
To begin, first make the class extend the `PlaceholderExpansion` and add the required methods:
|
|
```java
|
|
package at.helpch.placeholderapi.example.expansions;
|
|
|
|
import org.bukkit.OfflinePlayer;
|
|
import me.clip.placeholderapi.expansion.PlaceholderExpansion;
|
|
|
|
/**
|
|
* This class will automatically register as a placeholder expansion
|
|
* when a jar including this class is added to the directory
|
|
* {@code /plugins/PlaceholderAPI/expansions} on your server.
|
|
* <br>
|
|
* <br>If you create such a class inside your own plugin, you have to
|
|
* register it manually in your plugins {@code onEnable()} by using
|
|
* {@code new YourExpansionClass().register();}
|
|
*/
|
|
public class SomeExpansion extends PlaceholderExpansion {
|
|
|
|
/**
|
|
* This method should always return true unless we
|
|
* have a dependency we need to make sure is on the server
|
|
* for our placeholders to work!
|
|
*
|
|
* @return always true since we do not have any dependencies.
|
|
*/
|
|
@Override
|
|
public boolean canRegister(){
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* The name of the person who created this expansion should go here.
|
|
*
|
|
* @return The name of the author as a String.
|
|
*/
|
|
@Override
|
|
public String getAuthor(){
|
|
return "someauthor";
|
|
}
|
|
|
|
/**
|
|
* The placeholder identifier should go here.
|
|
* <br>This is what tells PlaceholderAPI to call our onRequest
|
|
* method to obtain a value if a placeholder starts with our
|
|
* identifier.
|
|
* <br>The identifier has to be lowercase and can't contain _ or %
|
|
*
|
|
* @return The identifier in {@code %<identifier>_<value>%} as String.
|
|
*/
|
|
@Override
|
|
public String getIdentifier(){
|
|
return "example";
|
|
}
|
|
|
|
/**
|
|
* This is the version of this expansion.
|
|
* <br>You don't have to use numbers, since it is set as a String.
|
|
*
|
|
* @return The version as a String.
|
|
*/
|
|
@Override
|
|
public String getVersion(){
|
|
return "1.0.0";
|
|
}
|
|
|
|
/**
|
|
* This is the method called when a placeholder with our identifier
|
|
* is found and needs a value.
|
|
* <br>We specify the value identifier in this method.
|
|
* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
|
|
*
|
|
* @param player
|
|
* A {@link org.bukkit.OfflinePlayer OfflinePlayer}.
|
|
* @param identifier
|
|
* A String containing the identifier/value.
|
|
*
|
|
* @return Possibly-null String of the requested identifier.
|
|
*/
|
|
@Override
|
|
public String onRequest(OfflinePlayer player, String identifier){
|
|
|
|
// %example_placeholder1%
|
|
if(identifier.equals("placeholder1")){
|
|
return "placeholder1 works";
|
|
}
|
|
|
|
// %example_placeholder2%
|
|
if(identifier.equals("placeholder2")){
|
|
return "placeholder2 works";
|
|
}
|
|
|
|
// We return null if an invalid placeholder (f.e. %example_placeholder3%)
|
|
// was provided
|
|
return null;
|
|
}
|
|
}
|
|
```
|
|
----
|
|
|
|
### With external plugin
|
|
Those examples here applies to people who want to provide information from their own plugin through placeholders from PlaceholderAPI.
|
|
There exists a repository showcasing an [example-expansion](/PlaceholderAPI/Example-Expansion) with what you can/should do.
|
|
|
|
In our examples do we have the plugin `SomePlugin` and want to show certain placeholders with it.
|
|
|
|
There are two ways to actually get information from your plugin and they only are different in if you have the expansion as a separate jar-file or as an internal class.
|
|
|
|
#### Separate jar
|
|
In our separate jar do we have to make some checks, to be sure, that the required plugin is installed and running.
|
|
The below code shows how the class can look like in case the plugin doesn't have a public and easy to access API.
|
|
|
|
```java
|
|
package at.helpch.placeholderapi.example.expansions;
|
|
|
|
import org.bukkit.OfflinePlayer;
|
|
import me.clip.placeholderapi.expansion.PlaceholderExpansion;
|
|
import at.helpch.placeholderapi.example.SomePlugin;
|
|
|
|
/**
|
|
* This class will automatically register as a placeholder expansion
|
|
* when a jar including this class is added to the directory
|
|
* {@code /plugins/PlaceholderAPI/expansions} on your server.
|
|
* <br>
|
|
* <br>If you create such a class inside your own plugin, you have to
|
|
* register it manually in your plugins {@code onEnable()} by using
|
|
* {@code new YourExpansionClass().register();}
|
|
*/
|
|
public class SomeExpansion extends PlaceholderExpansion {
|
|
|
|
// We get an instance of the plugin later.
|
|
private SomePlugin plugin;
|
|
|
|
/**
|
|
* Since this expansion requires api access to the plugin "SomePlugin"
|
|
* we must check if said plugin is on the server or not.
|
|
*
|
|
* @return true or false depending on if the required plugin is installed.
|
|
*/
|
|
@Override
|
|
public boolean canRegister(){
|
|
return (plugin = (SomePlugin) Bukkit.getPluginManager().getPlugin(getRequiredPlugin())) != null;
|
|
}
|
|
|
|
/**
|
|
* The name of the person who created this expansion should go here.
|
|
*
|
|
* @return The name of the author as a String.
|
|
*/
|
|
@Override
|
|
public String getAuthor(){
|
|
return "someauthor";
|
|
}
|
|
|
|
/**
|
|
* The placeholder identifier should go here.
|
|
* <br>This is what tells PlaceholderAPI to call our onRequest
|
|
* method to obtain a value if a placeholder starts with our
|
|
* identifier.
|
|
* <br>The identifier has to be lowercase and can't contain _ or %
|
|
*
|
|
* @return The identifier in {@code %<identifier>_<value>%} as String.
|
|
*/
|
|
@Override
|
|
public String getIdentifier(){
|
|
return "someplugin";
|
|
}
|
|
|
|
/**
|
|
* if the expansion requires another plugin as a dependency, the
|
|
* proper name of the dependency should go here.
|
|
* <br>Set this to {@code null} if your placeholders do not require
|
|
* another plugin to be installed on the server for them to work.
|
|
* <br>
|
|
* <br>This is extremely important to set your plugin here, since if
|
|
* you don't do it, your expansion will throw errors.
|
|
*
|
|
* @return The name of our dependency.
|
|
*/
|
|
@Override
|
|
public String getRequiredPlugin(){
|
|
return "SomePlugin";
|
|
}
|
|
|
|
/**
|
|
* This is the version of this expansion.
|
|
* <br>You don't have to use numbers, since it is set as a String.
|
|
*
|
|
* @return The version as a String.
|
|
*/
|
|
@Override
|
|
public String getVersion(){
|
|
return "1.0.0";
|
|
}
|
|
|
|
/**
|
|
* This is the method called when a placeholder with our identifier
|
|
* is found and needs a value.
|
|
* <br>We specify the value identifier in this method.
|
|
* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
|
|
*
|
|
* @param player
|
|
* A {@link org.bukkit.Player Player}.
|
|
* @param identifier
|
|
* A String containing the identifier/value.
|
|
*
|
|
* @return possibly-null String of the requested identifier.
|
|
*/
|
|
@Override
|
|
public String onPlaceholderRequest(Player player, String identifier){
|
|
|
|
if(p == null){
|
|
return "";
|
|
}
|
|
|
|
// %someplugin_placeholder1%
|
|
if(identifier.equals("placeholder1")){
|
|
return plugin.getConfig().getString("placeholder1", "value doesnt exist");
|
|
}
|
|
|
|
// %someplugin_placeholder2%
|
|
if(identifier.equals("placeholder2")){
|
|
return plugin.getConfig().getString("placeholder2", "value doesnt exist");
|
|
}
|
|
|
|
// We return null if an invalid placeholder (f.e. %someplugin_placeholder3%)
|
|
// was provided
|
|
return null;
|
|
}
|
|
}
|
|
```
|
|
|
|
----
|
|
#### Internal class
|
|
You can have the class inside your plugin.
|
|
This has some advantages but can also have some disadvantages.
|
|
If you include a PlaceholderExpansion class in your plugin, you MUST add an override the persist() method to return true
|
|
otherwise, if PlaceholderAPI is reloaded, your expansion will be unregistered and lost forever.
|
|
|
|
|
|
```java
|
|
package at.helpch.placeholderapi.example.expansions;
|
|
|
|
import org.bukkit.OfflinePlayer;
|
|
import me.clip.placeholderapi.expansion.PlaceholderExpansion;
|
|
import at.helpch.placeholderapi.example.SomePlugin;
|
|
|
|
/**
|
|
* This class will be registered through the register-method in the
|
|
* plugins onEnable-method.
|
|
*/
|
|
public class SomeExpansion extends PlaceholderExpansion {
|
|
|
|
private SomePlugin plugin;
|
|
|
|
/**
|
|
* Since we register the expansion inside our own plugin, we
|
|
* can simply use this method here to get an instance of our
|
|
* plugin.
|
|
*
|
|
* @param plugin
|
|
* The instance of our plugin.
|
|
*/
|
|
public SomeExpansion(SomePlugin plugin){
|
|
this.plugin = plugin;
|
|
}
|
|
|
|
/**
|
|
* Because this is an internal class,
|
|
* you must override this method to let PlaceholderAPI know to not unregister your expansion class when
|
|
* PlaceholderAPI is reloaded
|
|
*
|
|
* @return true to persist through reloads
|
|
*/
|
|
@Override
|
|
public boolean persist(){
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Because this is a internal class, this check is not needed
|
|
* and we can simply return {@code true}
|
|
*
|
|
* @return Always true since it's an internal class.
|
|
*/
|
|
@Override
|
|
public boolean canRegister(){
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* The name of the person who created this expansion should go here.
|
|
* <br>For convienience do we return the author from the plugin.yml
|
|
*
|
|
* @return The name of the author as a String.
|
|
*/
|
|
@Override
|
|
public String getAuthor(){
|
|
return plugin.getDescription().getAuthors().toString();
|
|
}
|
|
|
|
/**
|
|
* The placeholder identifier should go here.
|
|
* <br>This is what tells PlaceholderAPI to call our onRequest
|
|
* method to obtain a value if a placeholder starts with our
|
|
* identifier.
|
|
* <br>The identifier has to be lowercase and can't contain _ or %
|
|
*
|
|
* @return The identifier in {@code %<identifier>_<value>%} as String.
|
|
*/
|
|
@Override
|
|
public String getIdentifier(){
|
|
return "someplugin";
|
|
}
|
|
|
|
/**
|
|
* This is the version of the expansion.
|
|
* <br>You don't have to use numbers, since it is set as a String.
|
|
*
|
|
* For convienience do we return the version from the plugin.yml
|
|
*
|
|
* @return The version as a String.
|
|
*/
|
|
@Override
|
|
public String getVersion(){
|
|
return plugin.getDescription().getVersion();
|
|
}
|
|
|
|
/**
|
|
* This is the method called when a placeholder with our identifier
|
|
* is found and needs a value.
|
|
* <br>We specify the value identifier in this method.
|
|
* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
|
|
*
|
|
* @param player
|
|
* A {@link org.bukkit.Player Player}.
|
|
* @param identifier
|
|
* A String containing the identifier/value.
|
|
*
|
|
* @return possibly-null String of the requested identifier.
|
|
*/
|
|
@Override
|
|
public String onPlaceholderRequest(Player player, String identifier){
|
|
|
|
if(player == null){
|
|
return "";
|
|
}
|
|
|
|
// %someplugin_placeholder1%
|
|
if(identifier.equals("placeholder1")){
|
|
return plugin.getConfig().getString("placeholder1", "value doesnt exist");
|
|
}
|
|
|
|
// %someplugin_placeholder2%
|
|
if(identifier.equals("placeholder2")){
|
|
return plugin.getConfig().getString("placeholder2", "value doesnt exist");
|
|
}
|
|
|
|
// We return null if an invalid placeholder (f.e. %someplugin_placeholder3%)
|
|
// was provided
|
|
return null;
|
|
}
|
|
}
|
|
```
|
|
|
|
As you can see is this method pretty similar to the one without any external plugins, since we can get an instance of our plugin much easier and also have a 100% guarantee that the plugin is installed and running.
|
|
|
|
Our final step now is to register the class and its placeholders. The plugin doesn't do this on its own.
|
|
To achieve this, add the following to your `onEnable()` section (Use your expansion name of course):
|
|
```java
|
|
package at.helpch.placeholderapi.example
|
|
|
|
import org.bukkit.Bukkit;
|
|
import org.bukkit.plugin.java.JavaPlugin;
|
|
|
|
public class SomePlugin extends JavaPlugin{
|
|
|
|
@Override
|
|
public void onEnable(){
|
|
// Small check to make sure that PlaceholderAPI is installed
|
|
if(Bukkit.getPluginManager().getPlugin("PlaceholderAPI") != null){
|
|
new SomeExpansion(this).register();
|
|
}
|
|
}
|
|
}
|
|
```
|