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/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.core.data;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.mylyn.tasks.core.AbstractRepositoryConnector;
import org.eclipse.mylyn.tasks.core.IRepositoryManager;
import org.eclipse.mylyn.tasks.core.TaskRepository;
import org.eclipse.mylyn.tasks.core.data.AbstractTaskDataHandler;
import org.eclipse.mylyn.tasks.core.data.ITaskDataWorkingCopy;
import org.eclipse.mylyn.tasks.core.data.TaskData;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
/**
* @author Steffen Pingel
*/
public class TaskDataExternalizer {
private final IRepositoryManager taskRepositoryManager;
public TaskDataExternalizer(IRepositoryManager taskRepositoryManager) {
this.taskRepositoryManager = taskRepositoryManager;
}
private void migrate(final TaskDataState taskDataState) throws IOException {
// for testing
if (taskRepositoryManager == null) {
return;
}
String connectorKind = taskDataState.getConnectorKind();
AbstractRepositoryConnector connector = taskRepositoryManager.getRepositoryConnector(connectorKind);
if (connector == null) {
throw new IOException("No repository connector for kind \"" + connectorKind + "\" found");
}
String repositoryUrl = taskDataState.getRepositoryUrl();
final TaskRepository taskRepository = taskRepositoryManager.getRepository(connectorKind, repositoryUrl);
if (taskRepository == null) {
throw new IOException("Repository \"" + repositoryUrl + "\" not found for kind \"" + connectorKind + "\"");
}
final AbstractTaskDataHandler taskDataHandler = connector.getTaskDataHandler();
if (taskDataHandler != null) {
migrate(taskDataState.getLastReadData(), taskRepository, taskDataHandler);
migrate(taskDataState.getRepositoryData(), taskRepository, taskDataHandler);
migrate(taskDataState.getEditsData(), taskRepository, taskDataHandler);
}
}
private void migrate(final TaskData taskData, final TaskRepository taskRepository,
final AbstractTaskDataHandler taskDataHandler) {
if (taskData != null) {
SafeRunner.run(new ISafeRunnable() {
public void handleException(Throwable exception) {
// ignore
}
public void run() throws Exception {
taskDataHandler.migrateTaskData(taskRepository, taskData);
}
});
}
}
public TaskDataState readState(InputStream in) throws IOException {
try {
XMLReader parser = XMLReaderFactory.createXMLReader();
TaskDataStateReader handler = new TaskDataStateReader(taskRepositoryManager);
parser.setContentHandler(handler);
parser.parse(new InputSource(in));
TaskDataState taskDataState = handler.getTaskDataState();
if (taskDataState != null) {
migrate(taskDataState);
}
return taskDataState;
} catch (SAXException e) {
e.printStackTrace();
throw new IOException("Error parsing task data: " + e.getMessage());
}
}
public void writeState(OutputStream out, ITaskDataWorkingCopy state) throws IOException {
try {
SAXTransformerFactory transformerFactory = (SAXTransformerFactory) TransformerFactory.newInstance();
TransformerHandler handler = transformerFactory.newTransformerHandler();
Transformer serializer = handler.getTransformer();
serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
serializer.setOutputProperty(OutputKeys.INDENT, "yes");
handler.setResult(new StreamResult(out));
TaskDataStateWriter writer = new TaskDataStateWriter(handler);
writer.write(state);
} catch (TransformerException e) {
throw new IOException("Error writing task data" + e.getMessageAndLocation());
} catch (SAXException e) {
throw new IOException("Error writing task data" + e.getMessage());
}
}
}
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