/**
*Class XMLSerializer
*@author Martin Carlsson
*Internetprogrammering 4 Course
*/
import java.io.*;
import org.w3c.dom.*;

/**
*XMLSerializer - which is strongly influenced by the 
DOMSerializer(Java & XML, O'reilly, Mclaughlin sid 112) - is used 
*as a help class to DomEcho to get a printout of the XML document.
*@see DomEcho
*/
public class XMLSerializer {
    private String indention;
    private String newLine;
        
    public XMLSerializer() {
        indention="";
        newLine ="\n";
    }
    
    public void serialize(Document doc, OutputStream out) 
        throws IOException {
            Writer writer = new OutputStreamWriter(out);
            serialize(doc, writer);
    }
    
    public void serialize(Document doc, File file)
        throws IOException {
            Writer writer = new FileWriter(file);
            serialize(doc, writer);
    }
    
    public void serialize(Document doc, Writer writer)
        throws IOException {
            
            serializeNode(doc, writer, "");
            writer.flush();
    }
    
    /**
    Creates printouts to the chosen output source.
    */
    public void serializeNode(Node node, Writer writer, String indentLevel)
        throws IOException {
            
        switch(node.getNodeType()) {
            case Node.DOCUMENT_NODE:
                writer.write("<?xml version=\"1.0\"?>");
                writer.write(newLine);
                NodeList nodes = node.getChildNodes();
                if(nodes != null ){
                    for (int i=0; i< nodes.getLength(); i++) {
                        serializeNode(nodes.item(i), writer, "");
                    }
                }                    
                break;
            case Node.ELEMENT_NODE:
                String name = node.getNodeName();
                writer.write(indentLevel + "<" + name);
                NamedNodeMap attributes = node.getAttributes();
                for(int i=0; i< attributes.getLength(); i++) {
                    Node current = attributes.item(i);
                    writer.write(" " + current.getNodeName() + "=\"" + current.getNodeValue() +
                    "\"");
                }
                writer.write(">");
            
                NodeList children = node.getChildNodes();
                if(children != null) {
                    if((children.item(0) != null) && (children.item(0).getNodeType() == Node.ELEMENT_NODE)) {
                        writer.write(newLine);
                    }
                    for(int i=0;i<children.getLength(); i++) {
                        serializeNode(children.item(i), writer, indentLevel + indention);
                    }
                    if((children.item(0) != null) && (children.item(children.getLength()-1).getNodeType() == Node.ELEMENT_NODE)) {
                        
                        writer.write(indentLevel);
                    }
                }
                writer.write("</" + name + ">");
                break;
            
            case Node.TEXT_NODE:
                writer.write(node.getNodeValue());
                break;
            case Node.CDATA_SECTION_NODE:
                writer.write("<![CDATA[" + node.getNodeValue() + "]]>");
                break;
            case Node.COMMENT_NODE:
                writer.write(indentLevel + "<!-- " + node.getNodeValue() + " -->");
                writer.write(newLine);
                writer.write(newLine);
                break;
            case Node.PROCESSING_INSTRUCTION_NODE:
                writer.write("<?" + node.getNodeName() + " " +node.getNodeValue() + "?>");
                writer.write(newLine);
                break;
            case Node.ENTITY_REFERENCE_NODE:
                writer.write("&" + node.getNodeName() + ";");
                break;
            case Node.DOCUMENT_TYPE_NODE:
                DocumentType docType = (DocumentType)node;
                writer.write("<!DOCTYPE " + docType.getName());
                if(docType.getPublicId() != null)  {
                    System.out.print(" PUBLIC \"" + docType.getPublicId() + "\" ");
                }
                else {
                    writer.write(" SYSTEM ");
                }
                writer.write("\""+docType.getSystemId() + "\">");
                writer.write(newLine);
                break;
        }
    }
} // End class XMLSerializer