| /******************************************************************************* |
| * Copyright (c) 2004, 2008 Brock Janiczak 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: |
| * Brock Janiczak - initial API and implementation |
| * Tasktop Technologies - improvements |
| * Jevgeni Holodkov - improvements |
| *******************************************************************************/ |
| |
| package org.eclipse.mylyn.internal.context.core; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.net.URLEncoder; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipInputStream; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.mylyn.commons.core.StatusHandler; |
| import org.eclipse.mylyn.context.core.IInteractionContextScaling; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.XMLReader; |
| import org.xml.sax.helpers.XMLReaderFactory; |
| |
| /** |
| * @author Brock Janiczak |
| * @author Mik Kersten (refactoring) |
| */ |
| public class SaxContextReader implements IInteractionContextReader { |
| |
| private IInteractionContextScaling contextScaling; |
| |
| public SaxContextReader() { |
| } |
| |
| public void setContextScaling(IInteractionContextScaling contextScaling) { |
| this.contextScaling = contextScaling; |
| } |
| |
| /** |
| * Reads the first entry in the zip file if an entry matching the handleIdentifier is not found. |
| */ |
| public InteractionContext readContext(String handleIdentifier, File file) { |
| if (!file.exists()) { |
| return null; |
| } |
| try { |
| FileInputStream fileInputStream = new FileInputStream(file); |
| try { |
| ZipInputStream zipInputStream = new ZipInputStream(fileInputStream); |
| try { |
| // search for context entry |
| String encoded = URLEncoder.encode(handleIdentifier, |
| InteractionContextManager.CONTEXT_FILENAME_ENCODING); |
| String contextFileName = encoded + InteractionContextManager.CONTEXT_FILE_EXTENSION_OLD; |
| ZipEntry entry = zipInputStream.getNextEntry(); |
| while (entry != null) { |
| if (contextFileName.equals(entry.getName())) { |
| break; |
| } |
| entry = zipInputStream.getNextEntry(); |
| } |
| |
| if (entry == null) { |
| return null; |
| } |
| |
| SaxContextContentHandler contentHandler = new SaxContextContentHandler(handleIdentifier, |
| contextScaling); |
| XMLReader reader = XMLReaderFactory.createXMLReader(); |
| reader.setContentHandler(contentHandler); |
| reader.parse(new InputSource(zipInputStream)); |
| return contentHandler.getContext(); |
| } finally { |
| zipInputStream.close(); |
| } |
| } finally { |
| fileInputStream.close(); |
| } |
| } catch (Exception e) { |
| File saveFile = new File(file.getAbsolutePath() + "-save"); //$NON-NLS-1$ |
| StatusHandler.log(new Status(IStatus.ERROR, ContextCorePlugin.ID_PLUGIN, |
| "Error loading context, backup saved to \"" + saveFile + "\"", e)); //$NON-NLS-1$ //$NON-NLS-2$ |
| file.renameTo(saveFile); |
| return null; |
| } |
| } |
| } |