/*******************************************************************************
* Copyright (c) 2006, 2016 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.cdt.debug.internal.ui.preferences;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.StringTokenizer;
import org.eclipse.core.runtime.Assert;
public final class StringSetSerializer {
private static final String DELIM= "\0"; //$NON-NLS-1$
private StringSetSerializer() {
}
public static String serialize(Set<String> strings) {
Assert.isLegal(strings != null);
StringBuilder buf= new StringBuilder(strings.size() * 20);
for (Iterator<String> it= strings.iterator(); it.hasNext();) {
buf.append(it.next());
if (it.hasNext())
buf.append(DELIM);
}
return buf.toString();
}
public static Set<String> deserialize(String serialized) {
Assert.isLegal(serialized != null);
Set<String> marked= new HashSet<String>();
StringTokenizer tok= new StringTokenizer(serialized, DELIM);
while (tok.hasMoreTokens())
marked.add(tok.nextToken());
return marked;
}
public static String[] getDifference(String oldValue, String newValue) {
Set<String> oldSet= deserialize(oldValue);
Set<String> newSet= deserialize(newValue);
Set<String> intersection= new HashSet<String>(oldSet);
intersection.retainAll(newSet);
oldSet.removeAll(intersection);
newSet.removeAll(intersection);
oldSet.addAll(newSet);
return oldSet.toArray(new String[oldSet.size()]);
}
}