    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}