/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------------------------
* AttributedStringUtilities.java
* ------------------------------
* (C)opyright 2005, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: AttributedStringUtilities.java,v 1.2 2005/10/18 13:24:19 mungady Exp $
*
* Changes
* -------
* 29-Jul-2005 : Version 1(DG);
*
*/
package org.jfree.util;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.text.CharacterIterator;
import java.util.Map;
/**
* Some utility methods for working with <code>AttributedString</code> objects.
*
* @author David Gilbert
*/
public class AttributedStringUtilities {
/**
* Private constructor prevents object creation.
*/
private AttributedStringUtilities() {
}
/**
* Tests two attributed strings for equality.
*
* @param s1 string 1 (<code>null</code> permitted).
* @param s2 string 2 (<code>null</code> permitted).
*
* @return <code>true</code> if <code>s1</code> and <code>s2</code> are
* equal or both <code>null</code>, and <code>false</code>
* otherwise.
*/
public static boolean equal(AttributedString s1, AttributedString s2) {
if (s1 == null) {
return (s2 == null);
}
if (s2 == null) {
return false;
}
AttributedCharacterIterator it1 = s1.getIterator();
AttributedCharacterIterator it2 = s2.getIterator();
char c1 = it1.first();
char c2 = it2.first();
int start = 0;
while (c1 != CharacterIterator.DONE) {
int limit1 = it1.getRunLimit();
int limit2 = it2.getRunLimit();
if (limit1 != limit2) {
return false;
}
// if maps aren't equivalent, return false
Map m1 = it1.getAttributes();
Map m2 = it2.getAttributes();
if (!m1.equals(m2)) {
return false;
}
// now check characters in the run are the same
for (int i = start; i < limit1; i++) {
if (c1 != c2) {
return false;
}
c1 = it1.next();
c2 = it2.next();
}
start = limit1;
}
return c2 == CharacterIterator.DONE;
}
}