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/*******************************************************************************
* Copyright (c) 2011, 2012 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.internal.preferences;
import java.util.*;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.core.runtime.preferences.AbstractPreferenceStorage;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.osgi.util.NLS;
import org.osgi.service.prefs.BackingStoreException;
public class ScopeDescriptor {
String name;
AbstractPreferenceStorage storage;
Set loadedNodes = Collections.synchronizedSet(new HashSet());
public ScopeDescriptor(AbstractPreferenceStorage storage) {
super();
this.storage = storage;
}
String getName() {
return name;
}
/*
* For now the default behaviour is that we flush/load at the second level.
*/
IEclipsePreferences getLoadLevel(IEclipsePreferences node) {
String path = node.absolutePath();
int count = EclipsePreferences.getSegmentCount(path);
// root or scope root
if (count == 1 || count == 0)
return null;
// the load level we want
if (count == 2)
return node;
for (int i = count; i > 2 && node.parent() != null; i--)
node = (IEclipsePreferences) node.parent();
return node;
}
String[] childrenNames(final String path) throws BackingStoreException {
if (storage == null)
return new String[0];
final String[][] result = new String[1][];
final BackingStoreException[] bse = new BackingStoreException[1];
ISafeRunnable code = new ISafeRunnable() {
public void run() throws Exception {
result[0] = storage.childrenNames(path);
}
public void handleException(Throwable exception) {
if (exception instanceof BackingStoreException)
bse[0] = (BackingStoreException) exception;
else
bse[0] = new BackingStoreException(NLS.bind(PrefsMessages.childrenNames2, path), exception);
}
};
SafeRunner.run(code);
if (bse[0] != null)
throw bse[0];
return result[0] == null ? new String[0] : result[0];
}
Properties load(final String path) throws BackingStoreException {
if (storage == null)
return null;
final Properties[] result = new Properties[1];
final BackingStoreException[] bse = new BackingStoreException[1];
ISafeRunnable code = new ISafeRunnable() {
public void run() throws Exception {
result[0] = storage.load(path);
}
public void handleException(Throwable exception) {
if (exception instanceof BackingStoreException)
bse[0] = (BackingStoreException) exception;
else
bse[0] = new BackingStoreException(NLS.bind(PrefsMessages.preferences_loadException, path), exception);
}
};
SafeRunner.run(code);
if (bse[0] != null)
throw bse[0];
return result[0] == null ? null : result[0];
}
void save(final String path, final Properties properties) throws BackingStoreException {
if (storage == null)
return;
final BackingStoreException[] bse = new BackingStoreException[1];
ISafeRunnable code = new ISafeRunnable() {
public void run() throws Exception {
storage.save(path, properties);
}
public void handleException(Throwable exception) {
if (exception instanceof BackingStoreException)
bse[0] = (BackingStoreException) exception;
else
bse[0] = new BackingStoreException(NLS.bind(PrefsMessages.preferences_saveException, path), exception);
}
};
SafeRunner.run(code);
if (bse[0] != null)
throw bse[0];
}
boolean isAlreadyLoaded(String node) {
return loadedNodes.contains(node);
}
void loaded(String node) {
loadedNodes.add(node);
}
void removed(final String path) {
if (storage == null)
return;
SafeRunner.run(new ISafeRunnable() {
public void run() throws Exception {
storage.removed(path);
}
public void handleException(Throwable exception) {
// ignore here, error will be logged in saferunner
}
});
}
}
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