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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------------------ 28: * AttributedStringUtilities.java 29: * ------------------------------ 30: * (C)opyright 2005, by Object Refinery Limited and Contributors. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: AttributedStringUtilities.java,v 1.2 2005/10/18 13:24:19 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 29-Jul-2005 : Version 1(DG); 40: * 41: */ 42: 43: package org.jfree.util; 44: 45: import java.text.AttributedCharacterIterator; 46: import java.text.AttributedString; 47: import java.text.CharacterIterator; 48: import java.util.Map; 49: 50: /** 51: * Some utility methods for working with <code>AttributedString</code> objects. 52: * 53: * @author David Gilbert 54: */ 55: public class AttributedStringUtilities { 56: 57: /** 58: * Private constructor prevents object creation. 59: */ 60: private AttributedStringUtilities() { 61: } 62: 63: /** 64: * Tests two attributed strings for equality. 65: * 66: * @param s1 string 1 (<code>null</code> permitted). 67: * @param s2 string 2 (<code>null</code> permitted). 68: * 69: * @return <code>true</code> if <code>s1</code> and <code>s2</code> are 70: * equal or both <code>null</code>, and <code>false</code> 71: * otherwise. 72: */ 73: public static boolean equal(AttributedString s1, AttributedString s2) { 74: if (s1 == null) { 75: return (s2 == null); 76: } 77: if (s2 == null) { 78: return false; 79: } 80: AttributedCharacterIterator it1 = s1.getIterator(); 81: AttributedCharacterIterator it2 = s2.getIterator(); 82: char c1 = it1.first(); 83: char c2 = it2.first(); 84: int start = 0; 85: while (c1 != CharacterIterator.DONE) { 86: int limit1 = it1.getRunLimit(); 87: int limit2 = it2.getRunLimit(); 88: if (limit1 != limit2) { 89: return false; 90: } 91: // if maps aren't equivalent, return false 92: Map m1 = it1.getAttributes(); 93: Map m2 = it2.getAttributes(); 94: if (!m1.equals(m2)) { 95: return false; 96: } 97: // now check characters in the run are the same 98: for (int i = start; i < limit1; i++) { 99: 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: }