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: }
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