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/*******************************************************************************
* Copyright (c) 2004, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.internal.preferences;
import java.net.URL;
import java.util.*;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.osgi.service.datalocation.Location;
/**
* @since 3.0
*/
public class ConfigurationPreferences extends EclipsePreferences {
// cached values
private int segmentCount;
private String qualifier;
private IPath location;
private IEclipsePreferences loadLevel;
// cache which nodes have been loaded from disk
private static Set<String> loadedNodes = Collections.synchronizedSet(new HashSet<String>());
private static boolean initialized = false;
private static IPath baseLocation;
static {
Location location = PreferencesOSGiUtils.getDefault().getConfigurationLocation();
if (location != null) {
URL url = location.getURL();
if (url != null)
baseLocation = new Path(url.getFile());
}
}
/**
* Default constructor. Should only be called by #createExecutableExtension.
*/
public ConfigurationPreferences() {
this(null, null);
}
private ConfigurationPreferences(EclipsePreferences parent, String name) {
super(parent, name);
initializeChildren();
// cache the segment count
String path = absolutePath();
segmentCount = getSegmentCount(path);
if (segmentCount < 2)
return;
// cache the qualifier
qualifier = getSegment(path, 1);
// cache the location
if (qualifier == null)
return;
if (baseLocation != null)
location = computeLocation(baseLocation, qualifier);
}
@Override
protected IPath getLocation() {
return location;
}
@Override
protected boolean isAlreadyLoaded(IEclipsePreferences node) {
return loadedNodes.contains(node.name());
}
@Override
protected void loaded() {
loadedNodes.add(name());
}
/*
* Return the node at which these preferences are loaded/saved.
*/
@Override
protected IEclipsePreferences getLoadLevel() {
if (loadLevel == null) {
if (qualifier == null)
return null;
// Make it relative to this node rather than navigating to it from the root.
// Walk backwards up the tree starting at this node.
// This is important to avoid a chicken/egg thing on startup.
IEclipsePreferences node = this;
for (int i = 2; i < segmentCount; i++)
node = (EclipsePreferences) node.parent();
loadLevel = node;
}
return loadLevel;
}
protected void initializeChildren() {
if (initialized || parent == null)
return;
try {
synchronized (this) {
if (baseLocation == null)
return;
String[] names = computeChildren(baseLocation);
for (int i = 0; i < names.length; i++)
addChild(names[i], null);
}
} finally {
initialized = true;
}
}
@Override
protected EclipsePreferences internalCreate(EclipsePreferences nodeParent, String nodeName, Object context) {
return new ConfigurationPreferences(nodeParent, nodeName);
}
}
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