roundtrip.java

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//package org.xmlpull.v1.samples;

import java.io.*;

import org.kxml2.io.*;
import org.xmlpull.v1.*;
public class Roundtrip {
    //private static final String FEATURE_XML_ROUNDTRIP=
    //    "http://xmlpull.org/v1/doc/features.html#xml-roundtrip";

    XmlPullParser parser;
    XmlSerializer serializer;

    public Roundtrip(
        XmlPullParser parser,
        XmlSerializer serializer) {
        this.parser = parser;
        this.serializer = serializer;
    }

    public void writeStartTag()
        throws XmlPullParserException, IOException {
        //check forcase when feature xml roundtrip is supported
        //if (parser.getFeature (FEATURE_XML_ROUNDTRIP)) {
        //TODO: how to do pass through string with actual start tag in getText()
        //return;
        //}
        if (!parser
            .getFeature(
                XmlPullParser
                    .FEATURE_REPORT_NAMESPACE_ATTRIBUTES)) {
            for (int i =
                parser.getNamespaceCount(parser.getDepth() - 1);
                i
                    < parser.getNamespaceCount(parser.getDepth())
                        - 1;
                i++) {
                serializer.setPrefix(
                    parser.getNamespacePrefix(i),
                    parser.getNamespaceUri(i));
            }
        }
        serializer.startTag(
            parser.getNamespace(),
            parser.getName());

        for (int i = 0; i < parser.getAttributeCount(); i++) {
            serializer.attribute(
                parser.getAttributeNamespace(i),
                parser.getAttributeName(i),
                parser.getAttributeValue(i));
        }
        //serializer.closeStartTag();
    }

    public void writeToken()
        throws XmlPullParserException, IOException {
        switch (parser.getEventType()) {
            case XmlPullParser.START_DOCUMENT :
                serializer.startDocument (null, null);
                break;

            case XmlPullParser.END_DOCUMENT :
                serializer.endDocument();
                break;

            case XmlPullParser.START_TAG :
                writeStartTag();
                break;

            case XmlPullParser.END_TAG :
                serializer.endTag(
                    parser.getNamespace(),
                    parser.getName());
                break;

            case XmlPullParser.IGNORABLE_WHITESPACE :
                //comment it to remove ignorable whtespaces from XML infoset
                serializer.ignorableWhitespace(parser.getText());
                break;

            case XmlPullParser.TEXT :
            	if(parser.getText() == null)
            		System.err.println("null text error at: "+parser.getPositionDescription());
				else
					serializer.text(parser.getText());
                break;

            case XmlPullParser.ENTITY_REF :
            	if(parser.getText() != null)
            		serializer.text(parser.getText());
            	else 
            		serializer.entityRef(parser.getName());
                break;

            case XmlPullParser.CDSECT :
                serializer.cdsect(parser.getText());
                break;

            case XmlPullParser.PROCESSING_INSTRUCTION :
                serializer.processingInstruction(
                    parser.getText());
                break;

            case XmlPullParser.COMMENT :
                serializer.comment(parser.getText());
                break;

            case XmlPullParser.DOCDECL :
                serializer.docdecl(parser.getText());
                break;

            default :
                throw new RuntimeException(
                    "unrecognized event: "
                        + parser.getEventType());
        }
    }

    public void roundTrip()
        throws XmlPullParserException, IOException {
        	
        while (parser.getEventType() != XmlPullParser.END_DOCUMENT) {
            writeToken();
			serializer.flush();
            parser.nextToken();
        }
        writeToken();
    }

    public static void main(String[] args) throws Exception {
        if (args.length == 0)
            throw new RuntimeException("input xml file name expected");
        for (int i = 0; i < args.length; i++) {
            System.out.println("processing: " + args[i]);
            XmlPullParser pp = new KXmlParser();
            pp.setFeature(
                XmlPullParser.FEATURE_PROCESS_NAMESPACES,
                true);
            XmlSerializer serializer = new KXmlSerializer();

            pp.setInput(new FileReader(args[i]));
            serializer.setOutput(System.out, null);

            (new Roundtrip(pp, serializer)).roundTrip();
            serializer.flush();
        }
    }

}