| /******************************************************************************* |
| * Copyright (c) 2000, 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.jdt.internal.ui.text.folding; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.Platform; |
| |
| import org.eclipse.jdt.ui.PreferenceConstants; |
| import org.eclipse.jdt.ui.text.folding.IJavaFoldingStructureProvider; |
| |
| import org.eclipse.jdt.internal.ui.JavaPlugin; |
| |
| |
| /** |
| * @since 3.0 |
| */ |
| public class JavaFoldingStructureProviderRegistry { |
| |
| private static final String EXTENSION_POINT= "foldingStructureProviders"; //$NON-NLS-1$ |
| |
| /** The map of descriptors, indexed by their identifiers. */ |
| private Map fDescriptors; |
| |
| /** |
| * Creates a new instance. |
| */ |
| public JavaFoldingStructureProviderRegistry() { |
| } |
| |
| /** |
| * Returns an array of <code>IJavaFoldingProviderDescriptor</code> describing |
| * all extension to the <code>foldingProviders</code> extension point. |
| * |
| * @return the list of extensions to the |
| * <code>quickDiffReferenceProvider</code> extension point. |
| */ |
| public JavaFoldingStructureProviderDescriptor[] getFoldingProviderDescriptors() { |
| synchronized (this) { |
| ensureRegistered(); |
| return (JavaFoldingStructureProviderDescriptor[]) fDescriptors.values().toArray(new JavaFoldingStructureProviderDescriptor[fDescriptors.size()]); |
| } |
| } |
| |
| /** |
| * Returns the folding provider with identifier <code>id</code> or |
| * <code>null</code> if no such provider is registered. |
| * |
| * @param id the identifier for which a provider is wanted |
| * @return the corresponding provider, or <code>null</code> if none can be |
| * found |
| */ |
| public JavaFoldingStructureProviderDescriptor getFoldingProviderDescriptor(String id) { |
| synchronized (this) { |
| ensureRegistered(); |
| return (JavaFoldingStructureProviderDescriptor) fDescriptors.get(id); |
| } |
| } |
| |
| /** |
| * Instantiates and returns the provider that is currently configured in the |
| * preferences. |
| * |
| * @return the current provider according to the preferences |
| */ |
| public IJavaFoldingStructureProvider getCurrentFoldingProvider() { |
| String id= JavaPlugin.getDefault().getPreferenceStore().getString(PreferenceConstants.EDITOR_FOLDING_PROVIDER); |
| JavaFoldingStructureProviderDescriptor desc= getFoldingProviderDescriptor(id); |
| if (desc != null) { |
| try { |
| return desc.createProvider(); |
| } catch (CoreException e) { |
| JavaPlugin.log(e); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Ensures that the extensions are read and stored in |
| * <code>fDescriptors</code>. |
| */ |
| private void ensureRegistered() { |
| if (fDescriptors == null) |
| reloadExtensions(); |
| } |
| |
| /** |
| * Reads all extensions. |
| * <p> |
| * This method can be called more than once in |
| * order to reload from a changed extension registry. |
| * </p> |
| */ |
| public void reloadExtensions() { |
| IExtensionRegistry registry= Platform.getExtensionRegistry(); |
| Map map= new HashMap(); |
| |
| IConfigurationElement[] elements= registry.getConfigurationElementsFor(JavaPlugin.getPluginId(), EXTENSION_POINT); |
| for (int i= 0; i < elements.length; i++) { |
| JavaFoldingStructureProviderDescriptor desc= new JavaFoldingStructureProviderDescriptor(elements[i]); |
| map.put(desc.getId(), desc); |
| } |
| |
| synchronized(this) { |
| fDescriptors= Collections.unmodifiableMap(map); |
| } |
| } |
| |
| } |