| /******************************************************************************* |
| * Copyright (c) 2004, 2006 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 |
| * yyyymmdd bug Email and other contact information |
| * -------- -------- ----------------------------------------------------------- |
| * 20060825 155114 pmoogk@ca.ibm.com - Peter Moogk |
| * 20060830 155114 pmoogk@ca.ibm.com - Peter Moogk, Updated patch for this defect. |
| *******************************************************************************/ |
| package org.eclipse.jst.ws.internal.consumption.ui.widgets.object; |
| |
| 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.jst.ws.internal.consumption.ui.widgets.IObjectSelectionLaunchable; |
| import org.eclipse.wst.command.internal.env.core.data.Transformer; |
| |
| public class ObjectSelectionRegistry |
| { |
| private static ObjectSelectionRegistry instance; |
| private IConfigurationElement[] elements; |
| private Hashtable cachedSelectionWidgets; |
| |
| private ObjectSelectionRegistry() |
| { |
| elements = Platform.getExtensionRegistry().getConfigurationElementsFor("org.eclipse.jst.ws.consumption.ui", "objectSelectionWidget"); |
| cachedSelectionWidgets = new Hashtable(); |
| } |
| |
| public static ObjectSelectionRegistry getInstance() |
| { |
| if (instance == null) |
| { |
| instance = new ObjectSelectionRegistry(); |
| } |
| |
| return instance; |
| } |
| |
| /** |
| * |
| * @param id if the selection widget object. |
| * @return returns the transformer class if has been specified. Otherwise |
| * null is returned. |
| */ |
| public Transformer getTransformer( String id ) |
| { |
| TableEntry entry = getTableEntry( id ); |
| Transformer result = null; |
| |
| if( entry != null ) |
| { |
| try |
| { |
| Object object = entry.element.createExecutableExtension("transformer"); |
| |
| if( object instanceof Transformer ) |
| { |
| result = (Transformer)object; |
| } |
| } |
| catch( CoreException exc ){} |
| } |
| |
| return result; |
| } |
| |
| /** |
| * |
| * @param id if the selection widget object. |
| * @return returns the value of the external modify attribute if |
| * it has been specified. Otherwise false is returned. |
| */ |
| public boolean getExternalModify( String id ) |
| { |
| TableEntry entry = getTableEntry( id ); |
| boolean result = false; |
| |
| if( entry != null ) |
| { |
| String modifyString = entry.element.getAttribute("external_modify"); |
| |
| result = new Boolean( modifyString ).booleanValue(); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Gets the IObjectSelectionWidget based on the selectionId. If one is |
| * not found null is returned. |
| * |
| * @param selectionId the ID of the selection widget. |
| * @return returns the registered IObjectSelectionWidget object. |
| */ |
| public Object getSelectionWidget( String selectionId ) |
| { |
| TableEntry entry = getTableEntry( selectionId ); |
| |
| return entry == null ? null : entry.objectSelection; |
| } |
| |
| public void cleanup() |
| { |
| instance = null; |
| elements = null; |
| cachedSelectionWidgets = null; |
| } |
| |
| private TableEntry getTableEntry( String id ) |
| { |
| if( id == null ) return null; |
| |
| TableEntry entry = (TableEntry)cachedSelectionWidgets.get( id ); |
| |
| if( entry == null ) |
| { |
| for( int index = 0; index < elements.length; index++ ) |
| { |
| IConfigurationElement element = elements[index]; |
| String elemId = element.getAttribute( "id" ); |
| |
| if( id.equals( elemId ) ) |
| { |
| try |
| { |
| Object object = element.createExecutableExtension("class"); |
| |
| if( object instanceof IObjectSelectionWidget || object instanceof IObjectSelectionLaunchable ) |
| { |
| entry = new TableEntry(); |
| entry.element = element; |
| entry.objectSelection = object; |
| cachedSelectionWidgets.put( id, entry ); |
| break; |
| } |
| } |
| catch( CoreException exc ){} |
| } |
| } |
| } |
| |
| return entry; |
| } |
| |
| private class TableEntry |
| { |
| public IConfigurationElement element; |
| public Object objectSelection; |
| } |
| } |