source: trunk/gsdl3/src/java/org/greenstone/gsdl3/util/XMLConverter.java@ 3222

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
 *
 */
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;

    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;
    }
    
    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) {
    TextWriter t = new TextWriter(doc);
    return t.toString();
    }
}