jahiadomobject.java

java 写的一个新闻发布系统

//
//                                   ____.
//                       __/\ ______|    |__/\.     _______
//            __   .____|    |       \   |    +----+       \
//    _______|  /--|    |    |    -   \  _    |    :    -   \_________
//   \\______: :---|    :    :           |    :    |         \________>
//           |__\---\_____________:______:    :____|____:_____\
//                                      /_____|
//
//                 . . . i n   j a h i a   w e   t r u s t . . .
//
//
//
//  JahiaDOMObject
//
//  NK      25.07.2001
//

package org.jahia.data;

import java.io.*;
import java.util.*;


import org.w3c.dom.*;
import org.xml.sax.*;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;


import org.jahia.exceptions.*;
import org.jahia.utils.*;               // JahiaConsole


/**
 * A DOM Object typically contains a DOM Document
 *
 * @author Khue Nguyen
 * @version 1.0
 */
public abstract class JahiaDOMObject {
	

	protected Document xmlDoc = null;
	
	
   	//--------------------------------------------------------------------------
	/**
	 * save the document to a file
	 *
	 * @param String destFileName
	 */
	public void save (String destFileName) throws JahiaException{
		saveFile(destFileName);
	}	

   	//--------------------------------------------------------------------------
	/**
	 * return a reference to the DOM Document
	 *
	 * @return Document the DOM Document
	 */
	public Document getDocument () {
		return xmlDoc;
	}	

   	//--------------------------------------------------------------------------
	/**
	 * return a DOM as string
	 *
	 * @return Document the DOM Document
	 */
	public String toString () {
		Element el = (Element)xmlDoc.getDocumentElement();
		if (  el != null ){
			return el.toString();
		}
		return null;
	}	

    //--------------------------------------------------------------------------
	private void saveFile(String destinationFileName)
    throws JahiaException {

		try {

        	xmlDoc.normalize(); // cleanup DOM tree a little

        	TransformerFactory tfactory = TransformerFactory.newInstance();

        	// This creates a transformer that does a simple identity transform,
        	// and thus can be used for all intents and purposes as a serializer.
        	Transformer serializer = tfactory.newTransformer();

        	Properties oprops = new Properties();
        	oprops.put("method", "html");
        	oprops.put("indent-amount", "2");
        	serializer.setOutputProperties(oprops);
        	FileOutputStream fileStream = new FileOutputStream(destinationFileName);
        	serializer.transform(new DOMSource(xmlDoc),
                             new StreamResult(fileStream));

		} catch ( Throwable t ){
	   		throw new JahiaException(  "XMLPortlets",
                                        "Exception " + t.getMessage(),
                                        JahiaException.ERROR,
                                        JahiaException.SERVICE_ERROR);
		}		

    }

}