| /******************************************************************************* |
| * Copyright (c) 2006 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.ui.internal.texteditor.rulers; |
| |
| 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 strings) { |
| Assert.isLegal(strings != null); |
| StringBuffer buf= new StringBuffer(strings.size() * 20); |
| for (Iterator it= strings.iterator(); it.hasNext();) { |
| buf.append((String) it.next()); |
| if (it.hasNext()) |
| buf.append(DELIM); |
| } |
| return buf.toString(); |
| } |
| |
| public static Set deserialize(String serialized) { |
| Assert.isLegal(serialized != null); |
| Set marked= new HashSet(); |
| StringTokenizer tok= new StringTokenizer(serialized, DELIM); |
| while (tok.hasMoreTokens()) |
| marked.add(tok.nextToken()); |
| return marked; |
| } |
| |
| public static String[] getDifference(String oldValue, String newValue) { |
| Set oldSet= deserialize(oldValue); |
| Set newSet= deserialize(newValue); |
| Set intersection= new HashSet(oldSet); |
| intersection.retainAll(newSet); |
| oldSet.removeAll(intersection); |
| newSet.removeAll(intersection); |
| oldSet.addAll(newSet); |
| return (String[]) oldSet.toArray(new String[oldSet.size()]); |
| } |
| } |