com.liferay.util.xml.ElementComparator.java Source code

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Here is the source code for com.liferay.util.xml.ElementComparator.java

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/**
 * Copyright (c) 2000-2005 Liferay, LLC. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.liferay.util.xml;

import java.util.Comparator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Element;

/**
 * <a href="ElementComparator.java.html"><b><i>View Source</i></b></a>
 *
 * @author  Brian Wing Shun Chan
 * @version $Revision: 1.9 $
 *
 */
public class ElementComparator implements Comparator {

    public int compare(Object obj1, Object obj2) {
        Element el1 = (Element) obj1;
        Element el2 = (Element) obj2;

        String el1Name = el1.getName();
        String el2Name = el2.getName();

        if (!el1Name.equals(el2Name)) {
            return el1Name.compareTo(el2Name);
        }

        String el1Text = el1.getTextTrim();
        String el2Text = el2.getTextTrim();

        if (!el1Text.equals(el2Text)) {
            return el1Text.compareTo(el2Text);
        }

        List el1Attrs = el1.attributes();
        List el2Attrs = el2.attributes();

        if (el1Attrs.size() < el2Attrs.size()) {
            return -1;
        } else if (el1Attrs.size() > el2Attrs.size()) {
            return 1;
        }

        for (int i = 0; i < el1Attrs.size(); i++) {
            Attribute attr = (Attribute) el1Attrs.get(i);

            int value = _compare(el2Attrs, attr, new AttributeComparator());

            if (value != 0) {
                return value;
            }
        }

        List el1Elements = el1.elements();
        List el2Elements = el2.elements();

        if (el1Elements.size() < el2Elements.size()) {
            return -1;
        } else if (el1Elements.size() > el2Elements.size()) {
            return 1;
        }

        for (int i = 0; i < el1Elements.size(); i++) {
            Element el = (Element) el1Elements.get(i);

            int value = _compare(el2Elements, el, new ElementComparator());

            if (value != 0) {
                return value;
            }
        }

        return 0;
    }

    public boolean shouldJoinChildren(Element element) {
        return false;
    }

    private int _compare(List list, Object obj, Comparator comparator) {
        int firstValue = -1;

        for (int i = 0; i < list.size(); i++) {
            Object o = list.get(i);

            int value = comparator.compare(obj, o);

            if (i == 0) {
                firstValue = value;
            }

            if (value == 0) {
                return 0;
            }
        }

        return firstValue;
    }

}