    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    }