001 /* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jcommon/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * ------------------------------
028 * AttributedStringUtilities.java
029 * ------------------------------
030 * (C)opyright 2005, by Object Refinery Limited and Contributors.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: AttributedStringUtilities.java,v 1.2 2005/10/18 13:24:19 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 29-Jul-2005 : Version 1(DG);
040 *
041 */
042
043 package org.jfree.util;
044
045 import java.text.AttributedCharacterIterator;
046 import java.text.AttributedString;
047 import java.text.CharacterIterator;
048 import java.util.Map;
049
050 /**
051 * Some utility methods for working with <code>AttributedString</code> objects.
052 *
053 * @author David Gilbert
054 */
055 public class AttributedStringUtilities {
056
057 /**
058 * Private constructor prevents object creation.
059 */
060 private AttributedStringUtilities() {
061 }
062
063 /**
064 * Tests two attributed strings for equality.
065 *
066 * @param s1 string 1 (<code>null</code> permitted).
067 * @param s2 string 2 (<code>null</code> permitted).
068 *
069 * @return <code>true</code> if <code>s1</code> and <code>s2</code> are
070 * equal or both <code>null</code>, and <code>false</code>
071 * otherwise.
072 */
073 public static boolean equal(AttributedString s1, AttributedString s2) {
074 if (s1 == null) {
075 return (s2 == null);
076 }
077 if (s2 == null) {
078 return false;
079 }
080 AttributedCharacterIterator it1 = s1.getIterator();
081 AttributedCharacterIterator it2 = s2.getIterator();
082 char c1 = it1.first();
083 char c2 = it2.first();
084 int start = 0;
085 while (c1 != CharacterIterator.DONE) {
086 int limit1 = it1.getRunLimit();
087 int limit2 = it2.getRunLimit();
088 if (limit1 != limit2) {
089 return false;
090 }
091 // if maps aren't equivalent, return false
092 Map m1 = it1.getAttributes();
093 Map m2 = it2.getAttributes();
094 if (!m1.equals(m2)) {
095 return false;
096 }
097 // now check characters in the run are the same
098 for (int i = start; i < limit1; i++) {
099 if (c1 != c2) {
100 return false;
101 }
102 c1 = it1.next();
103 c2 = it2.next();
104 }
105 start = limit1;
106 }
107 return c2 == CharacterIterator.DONE;
108 }
109
110 }