source: trunk/gsdl3/src/java/org/greenstone/gsdl3/util/XMLConverter.java@ 3501

/*
 *    XMLConverter.java
 *    Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.util;

// XML classes
import org.w3c.dom.Document; 
import org.w3c.dom.Node; 
import org.xml.sax.InputSource;
import javax.xml.parsers.*;
import org.apache.xindice.xml.TextWriter;
import org.apache.xerces.dom.TextImpl;
import org.apache.xerces.parsers.DOMParser;

// other java classes
import java.io.Reader;
import java.io.StringReader;
import java.io.File;
import java.io.FileReader;

/** XMLConverter - utitlity class for greenstone
 *
 * parses XML Strings into Documents, converts Nodes to Strings
 * different parsers have different behaviour - can experiment in here
 *
 * @author <a href="mailto:[email protected]">Katherine Don</a>
 * @version $Revision: 3501 $
 *
 */
public class XMLConverter {

    /** JAXP parser factory */
    protected DocumentBuilderFactory doc_build_fact_=null;
    /** JAXP parser */
     protected DocumentBuilder doc_builder_=null;

    /** xerces parser */
    protected DOMParser parser_ = null;

     /** the no-args constructor */
    public XMLConverter() {
    try {
         doc_build_fact_ = DocumentBuilderFactory.newInstance();
        
         doc_builder_ = doc_build_fact_.newDocumentBuilder(); 
        parser_ = new DOMParser();
    } catch (Exception e) {
        System.out.println("XMLConverter:exception "+e.getMessage());
    }
    }

    /** returns a DOM Document */
    public Document getDOM(String in) {
        
    try {
        Reader reader = new StringReader(in);
        InputSource xml_source = new InputSource(reader);
        
        // Document doc = doc_builder_.parse(xml_source);
        parser_.parse(xml_source);
        Document doc = parser_.getDocument();
        return doc;

    } catch (Exception e) {
        System.out.println("XMLConverter.getDOM(String): exception "+e.getMessage());
    }
    return null;
    }
  
    /** returns a DOM Document */
    public Document getDOM(File in) {
    try {
        
        Reader reader = new FileReader(in);
        InputSource xml_source = new InputSource(reader);
        
        //Document doc = doc_builder_.parse(xml_source);
        parser_.parse(xml_source);
        Document doc = parser_.getDocument();
        
        return doc;

    } catch (Exception e) {
        System.out.println("XMLConverter.getDOM(File): exception "+e.getMessage());
    }
    return null;
    }

    /** creates a new empty DOM Document */
    public Document newDOM() {
    Document doc = doc_builder_.newDocument();
    return doc;
    }

    /** returns the Node as a String */
    public String getString(Node doc) {
    if (doc==null) {
        return "";
    }
    TextWriter t = new TextWriter(doc);
    return t.toString();
    }
}