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

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

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.util.xml;

import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
import com.liferay.portal.kernel.io.unsync.UnsyncStringReader;
import com.liferay.portal.kernel.util.FileUtil;
import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.portal.kernel.util.Validator;
import com.liferay.util.xml.descriptor.XMLDescriptor;

import java.io.File;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

/**
 * @author Jorge Ferrer
 */
public class XMLMergerRunner {

    public static void main(String[] args) throws ClassNotFoundException, DocumentException, IllegalAccessException,
            InstantiationException, IOException {

        if ((args != null) && (args.length == 4)) {
            XMLMergerRunner runner = new XMLMergerRunner(args[3]);

            runner.mergeAndSave(args[0], args[1], args[2]);
        } else {
            throw new IllegalArgumentException();
        }
    }

    public XMLMergerRunner(String descriptorClassName) {
        if (Validator.isNotNull(descriptorClassName)) {
            _descriptorClassName = descriptorClassName;
        }
    }

    public void mergeAndSave(String masterFile, String slaveFile, String mergedFile) throws ClassNotFoundException,
            DocumentException, IllegalAccessException, InstantiationException, IOException {

        mergeAndSave(new File(masterFile), new File(slaveFile), new File(mergedFile));
    }

    public void mergeAndSave(File masterFile, File slaveFile, File mergedFile) throws ClassNotFoundException,
            DocumentException, IllegalAccessException, InstantiationException, IOException {

        String xml1 = FileUtil.read(masterFile);
        String xml2 = FileUtil.read(slaveFile);

        String mergedXml = _merge(xml1, xml2);

        FileUtil.write(mergedFile, mergedXml);
    }

    private String _documentToString(Document doc, String docType) throws IOException {

        UnsyncByteArrayOutputStream unsyncByteArrayOutputStream = new UnsyncByteArrayOutputStream();

        OutputFormat format = OutputFormat.createPrettyPrint();

        format.setIndent("\t");
        format.setLineSeparator("\n");

        XMLWriter writer = new XMLWriter(unsyncByteArrayOutputStream, format);

        writer.write(doc);

        String xml = unsyncByteArrayOutputStream.toString();

        int pos = xml.indexOf("<?");

        String header = xml.substring(pos, xml.indexOf("?>", pos) + 2);

        xml = StringUtil.replace(xml, header, "");
        xml = header + "\n" + docType + "\n" + xml;

        return xml;
    }

    private String _merge(String masterXml, String slaveXml) throws ClassNotFoundException, DocumentException,
            IllegalAccessException, InstantiationException, IOException {

        int pos = masterXml.indexOf("<!DOCTYPE");

        String masterDoctype = "";

        if (pos >= 0) {
            masterDoctype = masterXml.substring(pos, masterXml.indexOf(">", pos) + 1);
            masterXml = StringUtil.replace(masterXml, masterDoctype, "");
        }

        pos = slaveXml.indexOf("<!DOCTYPE");

        String slaveDoctype = "";

        if (pos >= 0) {
            slaveDoctype = slaveXml.substring(pos, slaveXml.indexOf(">", pos) + 1);
            slaveXml = StringUtil.replace(slaveXml, slaveDoctype, "");
        }

        String doctype = null;

        if (Validator.isNotNull(masterDoctype)) {
            doctype = masterDoctype;
        } else {
            doctype = slaveDoctype;
        }

        SAXReader reader = new SAXReader();

        Document masterDoc = reader.read(new UnsyncStringReader(masterXml));
        Document slaveDoc = reader.read(new UnsyncStringReader(slaveXml));

        XMLDescriptor descriptor = null;

        if (_descriptorClassName.equals(_AUTO_DESCRIPTOR)) {
            descriptor = XMLTypeDetector.determineType(doctype, masterDoc);
        } else {
            descriptor = (XMLDescriptor) Class.forName(_descriptorClassName).newInstance();
        }

        XMLMerger merger = new XMLMerger(descriptor);

        Document mergedDoc = merger.merge(masterDoc, slaveDoc);

        return _documentToString(mergedDoc, doctype);
    }

    private static final String _AUTO_DESCRIPTOR = "auto";

    private String _descriptorClassName = _AUTO_DESCRIPTOR;

}