GrxPluginLoader.java

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/*
 * Copyright (c) 2008, AIST, the University of Tokyo and General Robotix Inc.
 * All rights reserved. This program is made available under the terms of the
 * Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 * General Robotix Inc.
 * National Institute of Advanced Industrial Science and Technology (AIST) 
 */
/*
 *  GrxPluginLoader.java
 *
 *  Copyright (C) 2007 GeneralRobotix, Inc.
 *  All Rights Reserved
 *
 *  @author Yuichiro Kawasumi (General Robotix, Inc.)
 */

package com.generalrobotix.ui.util;

import java.io.File;
import java.io.FilenameFilter;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

import com.generalrobotix.ui.GrxBasePlugin;
import com.generalrobotix.ui.GrxBaseView;
import com.generalrobotix.ui.GrxPluginManager;

public class GrxPluginLoader extends URLClassLoader {
        public GrxPluginLoader(String pluginDir, ClassLoader parent) {
                super(new URL[0], parent);
        }
        
        public GrxPluginLoader(String pluginDir) {
                this(pluginDir, null);
        }

        @SuppressWarnings("deprecation")
        public void addURL(String path) {
                File f = new File(path);
                if ( f.isDirectory() || (path.endsWith(".jar")&&f.exists())){
                        URL[] urls=getURLs();
                        for(URL url : urls){
                                if(url.equals(path))
                                        return;
                        }       
                        try{
                                super.addURL(f.toURL());
                                        System.out.println("classpath added: "+f.toString());
                        } catch (MalformedURLException e) {
                                e.printStackTrace();
                        }
                }else
                        return;
        }

        public Class<?> loadClass(String cname){
                try {
                        return super.loadClass(cname, true);
                } catch (ClassNotFoundException e) {
                        GrxDebugUtil.println("ClassNotFound "+cname);
                }
                return null;
        }
        
        public boolean existClass(String cname) {
                try{
                        super.loadClass(cname, true);
                        return true;
                }catch(ClassNotFoundException e){
                        return false;
                }
        }

        // ビューの作成。クラスの作成はGrxUIでは行わず、パースペクティブに任せることにしたので消した。
        /*
        public GrxBaseView createView( Class<? extends GrxBaseView> cls ) {
                String viewId = cls.getName();

                IWorkbench workbench = PlatformUI.getWorkbench();
        IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
        IWorkbenchPage page = window.getActivePage();
        IViewPart view = page.findView(viewId);
        // はじめて使われるビューの場合
        if(view==null) {
                System.out.println("[PERSPECTIVE] "+viewId+" is not Existence");
                try {
                        // これやると現在の（これから作るのではない）パースペクティブに表示されてしまうよ。だめじゃん。
                        view = page.showView(viewId);
                }catch( PartInitException e ) {
                        e.printStackTrace();
                }
        }

        if( view instanceof GrxBaseView  ) {
                System.out.println("[PERSPECTIVE] create "+viewId);
                return (GrxBaseView)view;
        }
        System.out.println("[PERSPECTIVE] create "+cls.getName()+" fault.");
        return null;
        }
        */

        // 指定されたプラグインのコンストラクタを実行、インスタンスを返す
        public GrxBasePlugin createPlugin(Class cls, String name, GrxPluginManager manager) {
                try {
                        // TODO: ビューの管理はEclipseにやらせている。以下は実際には不要
                        if( GrxBaseView.class.isAssignableFrom(cls) ) {
                                //GrxDebugUtil.println("[PM] "+cls+" is view");
                                //GrxBaseView vPlugin = createView( (Class<? extends GrxBaseView>) cls );
                                //vPlugin.setName(name);
                                //vPlugin.setManager(manager);
                                return null;//vPlugin;
                        }else{
                                //GrxDebugUtil.println("[PM] "+cls+" is item");
                                Constructor c = cls.getConstructor(new Class[] { String.class, GrxPluginManager.class });
                                return (GrxBasePlugin) c.newInstance(new Object[] { name, manager});
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return null;
        }
}