package com.jclark.xsl.sax;

import org.xml.sax.*;
import java.io.IOException;

public class OutputMethodHandlerImpl implements OutputMethodHandler {
  private XSLProcessor processor;
  private Destination dest;

  public OutputMethodHandlerImpl(XSLProcessor processor) {
    this.processor = processor;
  }

  public OutputMethodHandler createOutputMethodHandler(String uri) {
    Destination d = dest.resolve(uri);
    if (d == null)
      return null;
    OutputMethodHandlerImpl om = new OutputMethodHandlerImpl(processor);
    om.setDestination(d);
    return om;
  }

  public void setDestination(Destination dest) {
    this.dest = dest;
  }

  static private final String JAVA_OUTPUT_METHOD = "http://www.jclark.com/xt/java";

  public DocumentHandler createDocumentHandler(String name, AttributeList atts) throws SAXException, IOException {
    DocumentHandler handler = null;
    if (name == null)
      ;
    else if (name.startsWith(JAVA_OUTPUT_METHOD)
	     && (name.lastIndexOf(namespaceSeparator)
		 == JAVA_OUTPUT_METHOD.length())) {
      try {
	Class cls = Class.forName(name.substring(JAVA_OUTPUT_METHOD.length() + 1));
	handler = (DocumentHandler)cls.newInstance();
      }
      catch (ClassNotFoundException e) { }
      catch (InstantiationException e) { }
      catch (IllegalAccessException e) { }
      catch (ClassCastException e) { }
    }
    else if (name.equals("http://www.jclark.com/xt"
			 + namespaceSeparator
			 + "nxml"))
      handler = new NXMLOutputHandler();
    else if (name.equals("html"))
      handler = new HTMLOutputHandler();
    else if (name.equals("text"))
      handler = new TextOutputHandler();
    if (handler == null)
      handler = new XMLOutputHandler();
    if (handler instanceof OutputDocumentHandler)
      handler = ((OutputDocumentHandler)handler).init(dest, atts);
    return handler;
  }
}