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/*******************************************************************************
* Copyright (c) 2012 Tasktop Technologies and others.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* https://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.index.ui;
import java.io.File;
import java.util.concurrent.atomic.AtomicInteger;
import org.eclipse.mylyn.internal.tasks.core.IRepositoryModelListener;
import org.eclipse.mylyn.internal.tasks.index.core.TaskListIndex;
import org.eclipse.mylyn.internal.tasks.ui.TasksUiPlugin;
import org.eclipse.mylyn.tasks.core.IRepositoryManager;
/**
* @author David Green
* @author Steffen Pingel
*/
public class IndexReference extends AbstractIndexReference {
private static TaskListIndex theIndex;
private static AtomicInteger referenceCount = new AtomicInteger();
private static IRepositoryModelListener listener = new IRepositoryModelListener() {
public void loaded() {
synchronized (IndexReference.class) {
if (theIndex != null) {
theIndex.setLocation(getDefaultIndexLocation());
}
}
}
};
static File getDefaultIndexLocation() {
return new File(TasksUiPlugin.getDefault().getDataDirectory(), ".taskListIndex"); //$NON-NLS-1$
}
/**
* When not null serves as flag indicating that theIndex is referenced, thus preventing bad behaviour if dispose is
* called multiple times.
*/
private TaskListIndex index;
@Override
public TaskListIndex index() {
synchronized (IndexReference.class) {
if (index == null) {
if (theIndex == null && TasksUiPlugin.getTaskDataManager() != null) {
final IRepositoryManager repositoryManager = TasksUiPlugin.getRepositoryManager();
theIndex = new TaskListIndex(TasksUiPlugin.getTaskList(), TasksUiPlugin.getTaskDataManager(),
repositoryManager, getDefaultIndexLocation());
TasksUiPlugin.getDefault().addModelListener(listener);
}
index = theIndex;
referenceCount.incrementAndGet();
}
}
return index;
}
public void dispose() {
synchronized (IndexReference.class) {
if (index != null) {
index = null;
if (referenceCount.decrementAndGet() == 0) {
TasksUiPlugin.getDefault().removeModelListener(listener);
theIndex.close();
theIndex = null;
}
}
}
}
}
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