| /******************************************************************************* |
| * 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.wst.xml.core.internal.contentmodel.internal.modelqueryimpl; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.wst.xml.core.internal.Logger; |
| import org.eclipse.wst.xml.core.internal.contentmodel.modelquery.extension.ModelQueryExtension; |
| |
| public class ModelQueryExtensionRegistry |
| { |
| protected static final String EXTENSION_POINT_ID = "modelQueryExtensions"; //$NON-NLS-1$ |
| protected static final String TAG_NAME = "modelQueryExtension"; //$NON-NLS-1$ |
| private List descriptors; |
| |
| public List getApplicableExtensions(String contentTypeId, String namespace) |
| { |
| List list = new ArrayList(); |
| if (contentTypeId != null) |
| { |
| ensureExtensionsLoaded(); |
| for (Iterator i = descriptors.iterator(); i.hasNext();) |
| { |
| ModelQueryExtensionDescriptor descriptor = (ModelQueryExtensionDescriptor) i.next(); |
| if (contentTypeId.equals(descriptor.getContentTypeId())) |
| { |
| if (descriptor.getNamespace() == null || descriptor.getNamespace().equals(namespace)) |
| { |
| try |
| { |
| ModelQueryExtension extension = descriptor.createModelQueryExtension(); |
| list.add(extension); |
| } |
| catch (CoreException e) { |
| Logger.logException("problem creating model query extension", e); //$NON-NLS-1$ |
| } |
| } |
| } |
| } |
| } |
| return list; |
| } |
| |
| /* |
| * TODO : consider providing a non-plugin means add/remove extensions |
| * |
| public void addExtension(ModelQueryExtension extension) |
| { |
| } |
| |
| public void removeExtension(ModelQueryExtensionDeprecated extension) |
| { |
| }*/ |
| |
| /** |
| * Reads all extensions. |
| * <p> |
| * This method can be called more than once in order to reload from a changed |
| * extension registry. |
| * </p> |
| */ |
| private synchronized void reloadExtensions() |
| { |
| descriptors = new ArrayList(); |
| String bundleid = "org.eclipse.wst.xml.core"; //$NON-NLS-1$ |
| IConfigurationElement[] elements = Platform.getExtensionRegistry().getConfigurationElementsFor(bundleid, EXTENSION_POINT_ID); |
| for (int i = 0; i < elements.length; i++) |
| { |
| ModelQueryExtensionDescriptor descriptor = new ModelQueryExtensionDescriptor(elements[i]); |
| descriptors.add(descriptor); |
| } |
| } |
| |
| /** |
| * Ensures the extensions have been loaded at least once. |
| */ |
| private void ensureExtensionsLoaded() |
| { |
| if (descriptors == null) |
| { |
| reloadExtensions(); |
| } |
| } |
| } |