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 043package org.jfree.util; 044 045import java.text.AttributedCharacterIterator; 046import java.text.AttributedString; 047import java.text.CharacterIterator; 048import java.util.Map; 049 050/** 051 * Some utility methods for working with <code>AttributedString</code> objects. 052 * 053 * @author David Gilbert 054 */ 055public 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}