parseXML.java :  » Scripting » Pnuts » org » pnuts » xml » Java Open Source

/*
 * @(#)parseXML.java 1.2 04/12/06
 *
 * Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
 *
 * See the file "LICENSE.txt" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
package org.pnuts.xml;

import pnuts.lang.*;
import java.util.*;
import org.xml.sax.*;
import org.xml.sax.ContentHandler;
import javax.xml.parsers.*;
import org.xml.sax.helpers.DefaultHandler;

public class parseXML extends PnutsFunction {
  public parseXML(){
    super("parseXML");
  }

  public boolean defined(int nargs){
    return nargs >= 2 && nargs <= 4;
  }
  
  protected Object exec(Object[] args, Context context){
    int nargs = args.length;
    Object input;
    Object handler;
    Map properties = null;
    Object schema = null;
    if (nargs == 2){
      input = args[0];
      handler = args[1];
      schema = null;
    } else if (nargs == 3){
      input = args[0];
      handler = args[1];
      properties = (Map)args[2];
    } else if (nargs == 4){
      input = args[0];
      handler = args[1];
      properties = (Map)args[2];
      schema = args[3];
    } else {
      undefined(args, context);
      return null;
    }
    if (properties == null){
      properties = new LinkedHashMap();
    }
    if (schema != null){
       properties.put(Util.KEY_SCHEMA, schema);
    }
    DefaultHandler defaultHandler;
    if (handler == null){
      defaultHandler = Util.getDefaultErrorHandler(context);
    } else {
      defaultHandler = (DefaultHandler)Util.contentHandler(handler, context);
    }
    try {
      SAXParser parser = Util.getSAXParser(properties, context);
      parser.parse(Util.inputSource(input, context), defaultHandler);
      return null;
    } catch (Exception e){
      throw new PnutsException(e, context);
    }
  }

  public String toString(){
    return "function parseXML(input, handler {, properties {, schema }})";
  }
}