org.jfree.util.AttributedStringUtilities Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jtstand-common Show documentation

jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart

There is a newer version: 1.5.9

/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, AttributedStringUtilities.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

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 AttributedString objects.
 * 
 * @author David Gilbert
 */
public class AttributedStringUtilities {

    /**
     * Private constructor prevents object creation.
     */
    private AttributedStringUtilities() {
    }

    /**
     * Tests two attributed strings for equality.
     * 
     * @param s1  string 1 (null permitted).
     * @param s2  string 2 (null permitted).
     * 
     * @return true if s1 and s2 are
     *         equal or both null, and false 
     *         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;
    }
    
}