| /******************************************************************************* |
| * Copyright (c) 2005 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.command.internal.env.ui.registry; |
| |
| import java.util.Hashtable; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.wst.command.internal.env.ui.widgets.INamedWidgetContributorFactory; |
| |
| public class WidgetRegistry |
| { |
| private static WidgetRegistry registry_; |
| |
| private Hashtable entries_; |
| |
| private WidgetRegistry() |
| { |
| } |
| |
| public static WidgetRegistry instance() |
| { |
| if( registry_ == null ) |
| { |
| registry_ = new WidgetRegistry(); |
| registry_.load(); |
| } |
| |
| return registry_; |
| } |
| |
| /** |
| * |
| * @param id the methodId that may have WidgetContributor associated with it. |
| * @return returns a INamedWidgetContributorFactory if one was defined in the registry. |
| * Otherwise null is returned. |
| */ |
| public INamedWidgetContributorFactory getFactory( String id ) |
| { |
| INamedWidgetContributorFactory factory = null; |
| Entry entry = (Entry)entries_.get( id ); |
| |
| if( entry != null ) |
| { |
| try |
| { |
| if( entry.factory_ == null ) |
| { |
| entry.factory_ = (INamedWidgetContributorFactory)entry.element_.createExecutableExtension( "class" ); |
| } |
| |
| factory = entry.factory_; |
| } |
| catch( CoreException exc ) |
| { |
| exc.printStackTrace(); |
| } |
| catch( Throwable exc ) |
| { |
| exc.printStackTrace(); |
| } |
| } |
| |
| return factory; |
| } |
| |
| private void load() |
| { |
| IConfigurationElement[] elements = Platform.getExtensionRegistry().getConfigurationElementsFor("org.eclipse.wst.command.env.ui.widgetRegistry"); |
| |
| entries_ = new Hashtable(); |
| |
| for( int index = 0; index < elements.length; index++ ) |
| { |
| // If this is not an element that know about we will skip it. |
| if( !elements[index].getName().equals("widgetFactory") ) continue; |
| |
| Entry entry = new Entry(); |
| IConfigurationElement element = elements[index]; |
| String id = element.getAttribute( "id" ); |
| String methodId = element.getAttribute( "insertBeforeCommandId" ); |
| |
| entry.element_ = element; |
| entry.id_ = id; |
| |
| entries_.put( methodId, entry ); |
| } |
| } |
| |
| private class Entry |
| { |
| String id_; |
| IConfigurationElement element_; |
| INamedWidgetContributorFactory factory_; |
| } |
| } |