mirror of https://github.com/DanilaFe/abacus
79 lines
2.1 KiB
Java
79 lines
2.1 KiB
Java
package org.nwapw.abacus.plugin;
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import org.nwapw.abacus.function.Function;
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import java.lang.reflect.InvocationTargetException;
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import java.util.ArrayList;
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import java.util.HashMap;
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/**
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* A class that controls instances of plugins, allowing for them
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* to interact with each other and the calculator.
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*/
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public class PluginManager {
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/**
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* A list of loaded plugins.
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*/
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private ArrayList<Plugin> plugins;
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/**
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* List of functions that have been cached,
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* that is, found in a plugin and returned.
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*/
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private HashMap<String, Function> cachedFunctions;
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/**
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* Creates a new plugin manager.
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*/
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public PluginManager(){
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plugins = new ArrayList<>();
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cachedFunctions = new HashMap<>();
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}
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/**
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* Gets a function under the given name.
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* @param name the name of the function
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* @return the function under the given name.
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*/
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public Function functionFor(String name){
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if(cachedFunctions.containsKey(name)) {
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return cachedFunctions.get(name);
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}
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Function loadedFunction = null;
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for(Plugin plugin : plugins){
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if(plugin.hasFunction(name)){
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loadedFunction = plugin.getFunction(name);
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break;
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}
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}
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cachedFunctions.put(name, loadedFunction);
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return loadedFunction;
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}
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/**
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* Adds an instance of Plugin that already has been instantiated.
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* @param plugin the plugin to add.
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*/
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public void addInstantiated(Plugin plugin){
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plugin.load();
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cachedFunctions.clear();
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plugins.add(plugin);
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}
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/**
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* Instantiates a class of plugin, and adds it to this
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* plugin manager.
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* @param newClass the new class to instantiate.
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*/
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public void addClass(Class<?> newClass){
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if(!Plugin.class.isAssignableFrom(newClass)) return;
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try {
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addInstantiated((Plugin) newClass.getConstructor(PluginManager.class).newInstance(this));
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} catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
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e.printStackTrace();
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}
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}
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}
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