SAXCopy.java Source code

Introduction

Here is the source code for SAXCopy.java

Source

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

public class SAXCopy {
    static public void main(String[] arg) {
        String infilename = null;
        String outfilename = null;
        if (arg.length == 2) {
            infilename = arg[0];
            outfilename = arg[1];
        } else {
            usage();
        }

        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser parser = spf.newSAXParser();
            XMLReader reader = parser.getXMLReader();
            reader.setErrorHandler(new MyErrorHandler());
            FileOutputStream fos = new FileOutputStream(outfilename);
            PrintWriter out = new PrintWriter(fos);
            MyCopyHandler duper = new MyCopyHandler(out);
            reader.setContentHandler(duper);
            InputSource is = new InputSource(infilename);
            reader.parse(is);
            out.close();
        } catch (SAXException e) {
            System.exit(1);
        } catch (ParserConfigurationException e) {
            System.err.println(e);
            System.exit(1);
        } catch (IOException e) {
            System.err.println(e);
            System.exit(1);
        }
    }

    private static void usage() {
        System.err.println("Usage: SAXCopy <infile> <outfile>");
        System.exit(1);
    }
}

class MyCopyHandler implements ContentHandler {
    private boolean namespaceBegin = false;

    private String currentNamespace;

    private String currentNamespaceUri;

    private Locator locator;

    private PrintWriter out;

    public MyCopyHandler(PrintWriter out) {
        this.out = out;
    }

    public void setDocumentLocator(Locator locator) {
        this.locator = locator;
    }

    public void startDocument() {
        out.println("<?xml version=\"1.0\"?>");
        out.println();
    }

    public void endDocument() {
    }

    public void startPrefixMapping(String prefix, String uri) {
        namespaceBegin = true;
        currentNamespace = prefix;
        currentNamespaceUri = uri;
    }

    public void endPrefixMapping(String prefix) {
    }

    public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {
        out.print("<" + qName);
        if (namespaceBegin) {
            out.print(" xmlns:" + currentNamespace + "=\"" + currentNamespaceUri + "\"");
            namespaceBegin = false;
        }
        for (int i = 0; i < atts.getLength(); i++) {
            out.print(" " + atts.getQName(i) + "=\\" + atts.getValue(i) + "\"");
        }
        out.print(">");
    }

    public void endElement(String namespaceURI, String localName, String qName) {
        out.print("</" + qName + ">");
    }

    public void characters(char[] ch, int start, int length) {
        for (int i = start; i < start + length; i++)
            out.print(ch[i]);
    }

    public void ignorableWhitespace(char[] ch, int start, int length) {
        for (int i = start; i < start + length; i++)
            out.print(ch[i]);
    }

    public void processingInstruction(String target, String data) {
        out.print("<?" + target + " " + data + "?>");
    }

    public void skippedEntity(String name) {
        out.print("&" + name + ";");
    }
}

class MyErrorHandler implements ErrorHandler {
    public void warning(SAXParseException e) throws SAXException {
        show("Warning", e);
        throw (e);
    }

    public void error(SAXParseException e) throws SAXException {
        show("Error", e);
        throw (e);
    }

    public void fatalError(SAXParseException e) throws SAXException {
        show("Fatal Error", e);
        throw (e);
    }

    private void show(String type, SAXParseException e) {
        System.out.println(type + ": " + e.getMessage());
        System.out.println("Line " + e.getLineNumber() + " Column " + e.getColumnNumber());
        System.out.println("System ID: " + e.getSystemId());
    }
}

//Example XML document
/*  An XML Document
    
<?xml version="1.0" standalone="yes"?>
<person>
 <name>Joe Wang</name>
 <phone type="home">306 555-9999</phone>
 <email>joe@yoursite.net;</email>
</person>
    
    
*/