Copyright (c) 2009, 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
/*******************************************************************************
* Copyright (c) 2009, 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.util.*;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.preferences.*;
This class represents a preference node in the "bundle_defaults" scope. This scope is
used to represent default values which are set by the bundle in either its preference
initializer or in a file included with the bundle.
This differs from the regular default scope because it does not contain values set
by the product preference customization or the command-line.
Since: 3.3
/**
* This class represents a preference node in the "bundle_defaults" scope. This scope is
* used to represent default values which are set by the bundle in either its preference
* initializer or in a file included with the bundle.
*
* This differs from the regular default scope because it does not contain values set
* by the product preference customization or the command-line.
*
* @since 3.3
*/
public class BundleDefaultPreferences extends EclipsePreferences {
private static Set<String> loadedNodes = Collections.synchronizedSet(new HashSet<String>());
private String qualifier;
private int segmentCount;
private IEclipsePreferences loadLevel;
/*
* Default constructor.
*/
public BundleDefaultPreferences() {
this(null, null);
}
private BundleDefaultPreferences(EclipsePreferences parent, String name) {
super(parent, name);
// cache the segment count
IPath path = new Path(absolutePath());
segmentCount = path.segmentCount();
if (segmentCount < 2)
return;
// cache the qualifier
String scope = path.segment(0);
if (BundleDefaultsScope.SCOPE.equals(scope))
qualifier = path.segment(1);
// cache the location
if (qualifier == null)
return;
}
@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 = (IEclipsePreferences) node.parent();
loadLevel = node;
}
return loadLevel;
}
@Override
protected boolean isAlreadyLoaded(IEclipsePreferences node) {
return loadedNodes.contains(node.name());
}
@Override
protected void loaded() {
loadedNodes.add(name());
}
@Override
protected void load() {
// ensure that the same node in the "default" scope is loaded so this one is
// initialized properly
String relativePath = DefaultPreferences.getScopeRelativePath(absolutePath());
if (relativePath != null) {
// touch the node to force a load
PreferencesService.getDefault().getRootNode().node(DefaultScope.SCOPE).node(relativePath);
}
}
@Override
protected EclipsePreferences internalCreate(EclipsePreferences nodeParent, String nodeName, Object context) {
return new BundleDefaultPreferences(nodeParent, nodeName);
}
}