package com.quantum.util.xml;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.xml.serialize.DOMSerializer;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;


/**
 * <p>This class constructs a pretty-printing XML Serializer
 * 
 * @author BC
 */
public class XMLHelper {
    
    private XMLHelper() {}
    
    public static DOMSerializer createDOMSerializer(Writer writer) 
        throws IOException {
        XMLSerializer serializer = new XMLSerializer(writer, createOutputFormat());
        return serializer.asDOMSerializer();
    }

    public static DOMSerializer createDOMSerializer(OutputStream stream) 
        throws IOException {
        XMLSerializer serializer = new XMLSerializer(stream, createOutputFormat());
        return serializer.asDOMSerializer();
    }
    private static OutputFormat createOutputFormat() {
        OutputFormat format = new OutputFormat();
        format.setIndenting(true);
        format.setLineWidth(80);
        return format;
    }
    
    public static Document createEmptyDocument() throws ParserConfigurationException {
        DocumentBuilder builder = createDocumentBuilder();
        return builder.newDocument();
    }
    
    public static Document createFromInputStream(InputStream stream) 
        throws IOException, SAXException, ParserConfigurationException {
        DocumentBuilder builder = createDocumentBuilder();
        return builder.parse(stream);
    }

    private static DocumentBuilder createDocumentBuilder()
        throws FactoryConfigurationError, ParserConfigurationException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        return factory.newDocumentBuilder();
    }
    
    public static void write(Writer writer, Document document) 
        throws IOException {
        createDOMSerializer(writer).serialize(document);
    }

    public static void write(OutputStream stream, Document document) 
        throws IOException {
        createDOMSerializer(stream).serialize(document);
    }
}