| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ltk.internal.ui.refactoring; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.Platform; |
| |
| |
| public abstract class DescriptorManager { |
| |
| private String fExtensionPoint; |
| private String fVariableName; |
| private AbstractDescriptor[] fExtensions; |
| |
| public DescriptorManager(String extensionPoint, String variableName) { |
| Assert.isNotNull(extensionPoint); |
| Assert.isNotNull(variableName); |
| fExtensionPoint= extensionPoint; |
| fVariableName= variableName; |
| } |
| |
| public AbstractDescriptor getDescriptor(Object element) throws CoreException { |
| if (fExtensions == null) |
| init(); |
| |
| List candidates= new ArrayList(1); |
| for (int i= 0; i < fExtensions.length; i++) { |
| AbstractDescriptor descriptor= fExtensions[i]; |
| if (descriptor.matches(element, fVariableName)) { |
| candidates.add(descriptor); |
| } |
| descriptor.clear(); |
| } |
| if (candidates.size() == 0) |
| return null; |
| // No support for conflicts yet. |
| return (AbstractDescriptor)candidates.get(0); |
| } |
| |
| protected abstract AbstractDescriptor createDescriptor(IConfigurationElement element); |
| |
| // ---- extension point reading ----------------------------------- |
| |
| private void init() { |
| IExtensionRegistry registry= Platform.getExtensionRegistry(); |
| IConfigurationElement[] ces= registry.getConfigurationElementsFor( |
| RefactoringUIPlugin.getPluginId(), |
| fExtensionPoint); |
| fExtensions= new AbstractDescriptor[ces.length]; |
| for (int i= 0; i < ces.length; i++) { |
| fExtensions[i]= createDescriptor(ces[i]); |
| } |
| } |
| } |