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/*******************************************************************************
* Copyright (c) 2004 - 2005 University Of British Columbia and others.
* All rights reserved. This program and the accompanying materials
* are 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:
* University Of British Columbia - initial API and implementation
*******************************************************************************/
package org.eclipse.mylar.tasklist.internal;
import java.util.List;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.mylar.core.MylarPlugin;
import org.eclipse.mylar.tasklist.IContextEditorFactory;
import org.eclipse.mylar.tasklist.ITaskActivationListener;
import org.eclipse.mylar.tasklist.ITaskHandler;
import org.eclipse.mylar.tasklist.ITaskListDynamicSubMenuContributor;
import org.eclipse.mylar.tasklist.ITaskListExternalizer;
import org.eclipse.mylar.tasklist.MylarTasklistPlugin;
/**
* @author Shawn Minto
*/
public class TaskListExtensionReader {
public static final String EXTENSION_TASK_CONTRIBUTOR = "org.eclipse.mylar.tasklist.providers";
public static final String TASK_HANDLER_ELEMENT = "taskHandler";
public static final String EXTERNALIZER_CLASS_ID = "externalizerClass";
public static final String ACTION_CONTRIBUTOR_CLASS_ID = "taskHandlerClass";
public static final String TASK_LISTENER_ELEMENT = "taskListener";
public static final String TASK_LISTENER_CLASS_ID = "class";
public static final String DYNAMIC_POPUP_ELEMENT = "dynamicPopupMenu";
public static final String DYNAMIC_POPUP_CLASS_ID = "class";
public static final String EXTENSION_EDITORS = "org.eclipse.mylar.tasklist.editors";
public static final String EDITOR_FACTORY = "editorFactory";
public static final String EDITOR_FACTORY_CLASS = "class";
private static boolean extensionsRead = false;
private static TaskListExtensionReader thisReader = new TaskListExtensionReader();
// read the extensions and load the required plugins
public static void initExtensions(List<ITaskListExternalizer> externalizers, DefaultTaskListExternalizer defaultExternalizer) {
// code from "contributing to eclipse" with modifications for deprecated code
if(!extensionsRead){
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint extensionPoint = registry.getExtensionPoint(EXTENSION_TASK_CONTRIBUTOR);
IExtension[] extensions = extensionPoint.getExtensions();
for(int i = 0; i < extensions.length; i++){
IConfigurationElement[] elements = extensions[i].getConfigurationElements();
for(int j = 0; j < elements.length; j++){
if(elements[j].getName().compareTo(TASK_HANDLER_ELEMENT) == 0){
readTaskHandler(elements[j], externalizers);
} else if(elements[j].getName().compareTo(TASK_LISTENER_ELEMENT) == 0){
readTaskListener(elements[j]);
} else if(elements[j].getName().compareTo(DYNAMIC_POPUP_ELEMENT) == 0){
readDynamicPopupContributor(elements[j]);
}
}
}
IExtensionPoint editorsExtensionPoint = registry.getExtensionPoint(EXTENSION_EDITORS);
IExtension[] editors = editorsExtensionPoint.getExtensions();
for(int i = 0; i < editors.length; i++){
IConfigurationElement[] elements = editors[i].getConfigurationElements();
for(int j = 0; j < elements.length; j++){
if(elements[j].getName().compareTo(EDITOR_FACTORY) == 0){
readEditorFactory(elements[j]);
}
}
}
defaultExternalizer.setExternalizers(externalizers);
extensionsRead = true;
}
}
private static void readEditorFactory(IConfigurationElement element) {
try {
Object editor = element.createExecutableExtension(EDITOR_FACTORY_CLASS);
if (editor instanceof IContextEditorFactory) {
MylarTasklistPlugin.getDefault().addContextEditor((IContextEditorFactory)editor);
} else {
MylarPlugin.log("Could not load editor: " + editor.getClass().getCanonicalName() + " must implement " + IContextEditorFactory.class.getCanonicalName(), thisReader);
}
} catch (CoreException e){
MylarPlugin.log(e, "Could not load tasklist listener extension");
}
}
private static void readTaskListener(IConfigurationElement element) {
try{
Object taskListener = element.createExecutableExtension(TASK_LISTENER_CLASS_ID);
if (taskListener instanceof ITaskActivationListener) {
MylarTasklistPlugin.getDefault().addTaskListListener((ITaskActivationListener) taskListener);
} else {
MylarPlugin.log("Could not load tasklist listener: " + taskListener.getClass().getCanonicalName() + " must implement " + ITaskActivationListener.class.getCanonicalName(), thisReader);
}
} catch (CoreException e){
MylarPlugin.log(e, "Could not load tasklist listener extension");
}
}
private static void readDynamicPopupContributor(IConfigurationElement element) {
try{
Object dynamicPopupContributor = element.createExecutableExtension(DYNAMIC_POPUP_CLASS_ID);
if (dynamicPopupContributor instanceof ITaskListDynamicSubMenuContributor) {
MylarTasklistPlugin.getDefault().addDynamicPopupContributor((ITaskListDynamicSubMenuContributor) dynamicPopupContributor);
} else {
MylarPlugin.log("Could not load dyanmic popup menu: " + dynamicPopupContributor.getClass().getCanonicalName() + " must implement " + ITaskListDynamicSubMenuContributor.class.getCanonicalName(), thisReader);
}
} catch (CoreException e){
MylarPlugin.log(e, "Could not load dynamic popup extension");
}
}
private static void readTaskHandler(IConfigurationElement element, List<ITaskListExternalizer> externalizers) {
try{
Object externalizer = element.createExecutableExtension(EXTERNALIZER_CLASS_ID);
if (externalizer instanceof ITaskListExternalizer) {
externalizers.add((ITaskListExternalizer) externalizer);
} else {
MylarPlugin.log("Could not load externalizer: " + externalizer.getClass().getCanonicalName() + " must implement " + ITaskListExternalizer.class.getCanonicalName(), thisReader);
}
Object taskHandler = element.createExecutableExtension(ACTION_CONTRIBUTOR_CLASS_ID);
if (taskHandler instanceof ITaskHandler) {
MylarTasklistPlugin.getDefault().addTaskHandler((ITaskHandler) taskHandler);
}else {
MylarPlugin.log("Could not load contributor: " + taskHandler.getClass().getCanonicalName() + " must implement " + ITaskHandler.class.getCanonicalName(), thisReader);
}
} catch (CoreException e){
MylarPlugin.log(e, "Could not load task handler extension");
}
}
}
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