| /******************************************************************************* |
| * Copyright (c) 2008 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.validation.internal; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.osgi.util.NLS; |
| import org.eclipse.wst.validation.IValidatorGroupListener; |
| import org.eclipse.wst.validation.internal.plugin.ValidationPlugin; |
| |
| /** |
| * Process the validator group (for use with validator version 2 only) extension point. |
| * |
| * @author nitin |
| * |
| */ |
| public class ValidatorGroupExtensionReader { |
| |
| private static final String DOT = "."; //$NON-NLS-1$ |
| private static ValidatorGroupExtensionReader _instance; |
| |
| public static ValidatorGroupExtensionReader getDefault() { |
| if (_instance == null)_instance = new ValidatorGroupExtensionReader(); |
| return _instance; |
| } |
| |
| /** |
| * Map of group IDs to configuration elements |
| */ |
| private Map<String, List<IConfigurationElement>> _map; |
| |
| /** |
| * Map of group ID's to resolved configuration elements. |
| */ |
| private Map<String, IValidatorGroupListener[]> _resolved; |
| |
| private ValidatorGroupExtensionReader() { |
| init(); |
| } |
| |
| /** |
| * Answer the listeners with this group id. |
| * @param groupID |
| * @return an empty array there are no listeners for this group id. |
| */ |
| IValidatorGroupListener[] createListeners(String groupID) throws CoreException { |
| IValidatorGroupListener[] result = _resolved.get(groupID); |
| if (result != null)return result; |
| |
| List<IConfigurationElement> elements = _map.get(groupID); |
| if (elements == null){ |
| _resolved.put(groupID, new IValidatorGroupListener[0]); |
| String msg = NLS.bind("Configuration error, there is no validation listener group with id: {0}", groupID); //$NON-NLS-1$ |
| Status status = new Status(IStatus.ERROR, ValidationPlugin.PLUGIN_ID, msg); |
| throw new CoreException(status); |
| } |
| |
| List<IValidatorGroupListener> listeners = new ArrayList<IValidatorGroupListener>(elements.size()); |
| for (IConfigurationElement element : elements) { |
| IValidatorGroupListener listener; |
| try { |
| listener = (IValidatorGroupListener) element.createExecutableExtension(ExtensionConstants.Group.attClass); |
| listeners.add(listener); |
| } |
| catch (Exception e) { |
| ValidationPlugin.getPlugin().handleException(e); |
| listeners = new ArrayList<IValidatorGroupListener>(); |
| } |
| } |
| |
| result = listeners.toArray(new IValidatorGroupListener[listeners.size()]); |
| _resolved.put(groupID, result); |
| return result; |
| } |
| |
| /** |
| * Answer the extension point for the validatorGroups. |
| * |
| * @return null if there is a problem or no extensions. |
| */ |
| private IExtensionPoint getExtensionPoint() { |
| IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| return registry.getExtensionPoint(ValidationPlugin.PLUGIN_ID, ExtensionConstants.group); |
| } |
| |
| private void init() { |
| _map = new HashMap<String, List<IConfigurationElement>>(4); |
| _resolved = new HashMap<String, IValidatorGroupListener[]>(4); |
| |
| IExtensionPoint extensionPoint = getExtensionPoint(); |
| if (extensionPoint != null) { |
| for (IExtension ext : extensionPoint.getExtensions()) { |
| for (IConfigurationElement group : ext.getConfigurationElements()) { |
| processGroupElement(group); |
| } |
| } |
| } |
| } |
| |
| private void processGroupElement(IConfigurationElement element) { |
| if (!ExtensionConstants.Group.elementGroup.equals(element.getName()))return; |
| |
| String id = element.getAttribute(ExtensionConstants.Group.attId); |
| if (id == null)throw new IllegalStateException("Configuration error, the " + //$NON-NLS-1$ |
| ExtensionConstants.Group.attId + " is required"); //$NON-NLS-1$ |
| // force the use of a qualified ID |
| if (id.indexOf(DOT) < 0) { |
| id = element.getContributor().getName() + DOT + id; |
| } |
| IConfigurationElement[] newElements = element.getChildren(ExtensionConstants.Group.elementListener); |
| if (newElements.length > 0) { |
| List<IConfigurationElement> elements = _map.get(id); |
| if (elements == null) { |
| elements = new ArrayList<IConfigurationElement>(); |
| _map.put(id, elements); |
| } |
| elements.addAll(Arrays.asList(newElements)); |
| } |
| } |
| } |