| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.core; |
| |
| import org.eclipse.core.runtime.preferences.IEclipsePreferences; |
| import org.eclipse.core.runtime.preferences.InstanceScope; |
| import org.eclipse.core.runtime.preferences.PreferenceModifyListener; |
| import org.eclipse.jdt.core.*; |
| import org.osgi.service.prefs.BackingStoreException; |
| import org.osgi.service.prefs.Preferences; |
| |
| public class JavaCorePreferenceModifyListener extends PreferenceModifyListener { |
| |
| static int PREFIX_LENGTH = JavaModelManager.CP_CONTAINER_PREFERENCES_PREFIX.length(); |
| JavaModel javaModel = JavaModelManager.getJavaModelManager().getJavaModel(); |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.core.runtime.preferences.PreferenceModifyListener#preApply(org.eclipse.core.runtime.preferences.IEclipsePreferences) |
| */ |
| public IEclipsePreferences preApply(IEclipsePreferences node) { |
| Preferences instance = node.node(InstanceScope.SCOPE); |
| cleanJavaCore(instance.node(JavaCore.PLUGIN_ID)); |
| return super.preApply(node); |
| } |
| |
| /** |
| * Clean imported preferences from obsolete keys. |
| * |
| * @param preferences JavaCore preferences. |
| */ |
| void cleanJavaCore(Preferences preferences) { |
| try { |
| String[] keys = preferences.keys(); |
| for (int k = 0, kl= keys.length; k<kl; k++) { |
| String key = keys[k]; |
| if (key.startsWith(JavaModelManager.CP_CONTAINER_PREFERENCES_PREFIX) && !isJavaProjectAccessible(key)) { |
| preferences.remove(key); |
| } |
| } |
| } catch (BackingStoreException e) { |
| // do nothing |
| } |
| } |
| |
| /** |
| * Returns whether a java project referenced in property key |
| * is still longer accessible or not. |
| * |
| * @param propertyName |
| * @return true if a project is referenced in given key and this project |
| * is still accessible, false otherwise. |
| */ |
| boolean isJavaProjectAccessible(String propertyName) { |
| int index = propertyName.indexOf('|', PREFIX_LENGTH); |
| if (index > 0) { |
| final String projectName = propertyName.substring(PREFIX_LENGTH, index).trim(); |
| JavaProject project = (JavaProject) this.javaModel.getJavaProject(projectName); |
| if (project.getProject().isAccessible()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } |