Xml.java

/**********************************************************************************
*
**********************************************************************************/

// package
package org.nees.rbnb;

// imports
import org.w3c.dom.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.apache.xml.serialize.*;
import java.net.*;
import java.io.*;

public class Xml
{

    public static final String XML_TAG_FOR_ERROR_MESSAGE = "errorMessage";
    public static final String XML_TAG_FOR_STATUS_MESSAGE = "statusMessage";

    public static Document createDocument()
    {
        try
        {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.newDocument();

            return doc;
        }
        catch (Exception any)
        {
            return null;
        }

    }   // createDocument

    public static Document readDocument(String name)
    {
        try
        {
            // parse the xml from the url (code taken from log4j)
            InputStreamReader in = new InputStreamReader(new FileInputStream(name), "UTF-8");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = dbf.newDocumentBuilder();
            InputSource inputSource = new InputSource(in);
            Document doc = docBuilder.parse(inputSource);
            return doc;
        }
        catch (Exception any)
        {
            return null;
        }

    }   // readDocument

    public static Document readDocumentFromString(String in)
    {
        try
        {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = dbf.newDocumentBuilder();
            InputSource inputSource = new InputSource(new StringReader(in));
            Document doc = docBuilder.parse(inputSource);
            return doc;
        }
        catch (Exception any)
        {
            return null;
        }

    }   // readDocumentFromString

    public static void writeDocument(Document doc, String fileName)
                throws IOException
    {
        OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(fileName), "UTF-8");
        // Note: using xerces %%% is there a org.w3c.dom way to do this?
        XMLSerializer s = new XMLSerializer(out, new OutputFormat(
                            "xml", "UTF-8", true));
        s.serialize(doc);
        out.close();

    }   // writeDocument

    public static String writeDocumentToString(Document doc) throws IOException
    {
        StringWriter sw = new StringWriter();
        // Note: using xerces %%% is there a org.w3c.dom way to do this?
        XMLSerializer s = new XMLSerializer(sw, new OutputFormat(
                                "xml", "UTF-8", true /*doc*/));
        s.serialize(doc);

        sw.flush();
        return sw.toString();

    }   // writeDocument
    
    public static String errorXml(String problem, String reason)
    {
        return
            "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<" + XML_TAG_FOR_ERROR_MESSAGE +">\n" +
            "  <problem>" +
                 problem +
            "  </problem>\n" +
            "  <reason>" +
                reason +
            "  </reason>\n" +
            "</" + XML_TAG_FOR_ERROR_MESSAGE +">";
    }

    public static String statusXml(String string) {
        return
            "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<" + XML_TAG_FOR_STATUS_MESSAGE +">" +
                string +
            "</" + XML_TAG_FOR_STATUS_MESSAGE +">\n";
    }

}   // Xml

/**********************************************************************************
*
* $Header: /disks/cvs/neesgrid/turbine/src/org/nees/rbnb/Xml.java,v 1.4 2004/06/29 07:41:31 weymouth Exp $
*
**********************************************************************************/

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