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/*******************************************************************************
* Copyright (c) 2009 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.externalization;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.mylyn.commons.core.XmlMemento;
import org.eclipse.mylyn.internal.tasks.core.AbstractTask;
import org.eclipse.mylyn.internal.tasks.core.ITasksCoreConstants;
import org.eclipse.mylyn.internal.tasks.core.TaskActivationHistory;
import org.eclipse.mylyn.internal.tasks.core.TaskList;
import org.eclipse.mylyn.tasks.core.ITask;
import org.eclipse.mylyn.tasks.core.ITaskActivationListener;
/**
* @author Steffen Pingel
*/
public class TaskActivationExternalizationParticipant extends AbstractExternalizationParticipant implements
ITaskActivationListener {
private final ExternalizationManager externalizationManager;
private boolean dirty;
private final TaskActivationHistory activationHistory;
private final File file;
private final TaskList taskList;
public TaskActivationExternalizationParticipant(ExternalizationManager externalizationManager, TaskList taskList,
TaskActivationHistory history, File file) {
this.externalizationManager = externalizationManager;
this.taskList = taskList;
this.activationHistory = history;
this.file = file;
}
@Override
public String getDescription() {
return Messages.TaskActivationExternalizationParticipant_Task_Activation_History;
}
@Override
public ISchedulingRule getSchedulingRule() {
return ITasksCoreConstants.ACTIVITY_SCHEDULING_RULE;
}
@Override
public boolean isDirty() {
return dirty;
}
private void requestSave() {
synchronized (TaskActivationExternalizationParticipant.this) {
dirty = true;
}
externalizationManager.requestSave();
}
@Override
public void load(File sourceFile, IProgressMonitor monitor) throws CoreException {
try {
activationHistory.clear();
if (file.exists()) {
FileReader reader = new FileReader(file);
try {
XmlMemento memento = XmlMemento.createReadRoot(reader);
XmlMemento[] items = memento.getChildren("task"); //$NON-NLS-1$
for (XmlMemento child : items) {
String handle = child.getString("handle"); //$NON-NLS-1$
if (handle != null) {
AbstractTask task = taskList.getTask(handle);
if (task != null) {
activationHistory.addTaskInternal(task);
}
}
}
} finally {
reader.close();
}
}
} catch (InvocationTargetException e) {
throw new CoreException(new Status(IStatus.ERROR, ITasksCoreConstants.ID_PLUGIN,
"Failed to load task activation history", e)); //$NON-NLS-1$
} catch (IOException e) {
throw new CoreException(new Status(IStatus.ERROR, ITasksCoreConstants.ID_PLUGIN,
"Failed to load task activation history", e)); //$NON-NLS-1$
}
}
@Override
public void save(File targetFile, IProgressMonitor monitor) throws CoreException {
synchronized (TaskActivationExternalizationParticipant.this) {
dirty = false;
}
XmlMemento memento = XmlMemento.createWriteRoot("taskActivationHistory"); //$NON-NLS-1$
for (AbstractTask task : activationHistory.getPreviousTasks()) {
XmlMemento child = memento.createChild("task"); //$NON-NLS-1$
child.putString("handle", task.getHandleIdentifier()); //$NON-NLS-1$
}
try {
file.getParentFile().mkdirs();
FileWriter writer = new FileWriter(file);
try {
memento.save(writer);
} finally {
writer.close();
}
} catch (IOException e) {
throw new CoreException(new Status(IStatus.ERROR, ITasksCoreConstants.ID_PLUGIN,
"Failed to save task activation history", e)); //$NON-NLS-1$
}
}
@Override
public String getFileName() {
return file.getName();
}
@Override
public File getFile(String rootPath) throws CoreException {
return file;
}
public void preTaskActivated(ITask task) {
// ignore
}
public void preTaskDeactivated(ITask task) {
// ignore
}
public void taskActivated(ITask task) {
activationHistory.addTask((AbstractTask) task);
requestSave();
}
public void taskDeactivated(ITask task) {
// ignore
}
}
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