| /** |
| * Copyright (c) 2007 Borland Software Corporation |
| * |
| * 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: |
| * bblajer - initial API and implementation |
| */ |
| package org.eclipse.gmf.internal.runtime.lite; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtensionDelta; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.IRegistryChangeEvent; |
| import org.eclipse.core.runtime.IRegistryChangeListener; |
| |
| /** |
| * Reads the extension point registry and creates objects representing registry values (registers the values). |
| * Objects may be kept in sync with the registry by overriding {@link #unreadElement(IConfigurationElement)}. |
| */ |
| public abstract class RegistryReader implements IRegistryChangeListener { |
| private IExtensionRegistry myExtensionRegistry; |
| private String myPluginID; |
| private String myExtensionPointID; |
| private boolean myIsActive; |
| |
| public RegistryReader(IExtensionRegistry extensionRegistry, String pluginID, String extensionPointID) { |
| myExtensionRegistry = extensionRegistry; |
| myPluginID = pluginID; |
| myExtensionPointID = extensionPointID; |
| } |
| |
| /** |
| * Reads the given configuration element and registers this element declaration. Returns whether the element's child configuration elements |
| * should be recursively processed. |
| * If the element is not recognized or invalid, the implementors may either return <code>false</code> or throw an |
| * {@link IllegalArgumentException}. |
| * @throws IllegalArgumentException if the element is not recognized or invalid (optional). |
| */ |
| protected boolean readElement(IConfigurationElement configurationElement) throws IllegalArgumentException { |
| return false; |
| } |
| |
| /** |
| * Reads the given configuration element and unregisters this element declaration. Returns whether the element's child configuration elements |
| * should be recursively processed. |
| * If the element is not recognized or invalid, the implementors may either return <code>false</code> or throw an |
| * {@link IllegalArgumentException}. |
| * @throws IllegalArgumentException if the element is not recognized or invalid (optional). |
| */ |
| protected boolean unreadElement(IConfigurationElement configurationElement) throws IllegalArgumentException { |
| return false; |
| } |
| |
| public void readRegistry() { |
| assert !myIsActive; |
| myIsActive = true; |
| IExtensionPoint extensionPoint = myExtensionRegistry.getExtensionPoint(myPluginID, myExtensionPointID); |
| if (extensionPoint != null) { |
| for (IConfigurationElement element : extensionPoint.getConfigurationElements()) { |
| recursiveReadElement(element, true); |
| } |
| } |
| myExtensionRegistry.addRegistryChangeListener(this); |
| } |
| |
| public void dispose() { |
| if (myIsActive) { |
| myExtensionRegistry.removeRegistryChangeListener(this); |
| myIsActive = false; |
| } |
| } |
| |
| public void registryChanged(IRegistryChangeEvent event) { |
| for (IExtensionDelta extensionDelta : event.getExtensionDeltas(myPluginID, myExtensionPointID)) { |
| boolean isAdd = extensionDelta.getKind() == IExtensionDelta.ADDED; |
| for (IConfigurationElement element : extensionDelta.getExtension().getConfigurationElements()) { |
| recursiveReadElement(element, isAdd); |
| } |
| } |
| } |
| |
| private void recursiveReadElement(IConfigurationElement element, boolean isAdd) { |
| try { |
| boolean recurse = isAdd ? readElement(element) : unreadElement(element); |
| if (recurse) { |
| for (IConfigurationElement child : element.getChildren()) { |
| recursiveReadElement(child, isAdd); |
| } |
| } |
| } catch (IllegalArgumentException e) { |
| logError(element, "Exception occurred while reading plugin registry", e); //$NON-NLS-1$ |
| } |
| } |
| |
| protected void logError(IConfigurationElement element, String message) { |
| logError(element, message, null); |
| } |
| |
| protected void logError(IConfigurationElement element, String message, Throwable e) { |
| Activator.getDefault().logError(formatMessage(message, element), e); //$NON-NLS-1$ |
| } |
| |
| private String formatMessage(String message, IConfigurationElement context) { |
| if (context == null) { |
| return message; |
| } |
| StringBuilder buf = new StringBuilder(); |
| buf.append("Plugin ").append(context.getDeclaringExtension().getContributor().getName()).append(", extension ").append(context.getDeclaringExtension().getExtensionPointUniqueIdentifier()).append(": "); |
| buf.append(message); |
| return buf.toString(); |
| } |
| } |