/* An actor that outputs data read from a URL.

 @Copyright (c) 2003-2007 The Regents of the University of California.
 All rights reserved.

 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the
 above copyright notice and the following two paragraphs appear in all
 copies of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION 2
 COPYRIGHTENDKEY
 */
package ptolemy.actor.lib.conversions;

import ptolemy.actor.lib.Transformer;
import ptolemy.data.StringToken;
import ptolemy.data.XMLToken;
import ptolemy.data.type.BaseType;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;

//////////////////////////////////////////////////////////////////////////
//// StringToXml

/**
 <p>This actor converts a string token to an xml token.

 </p><p>FIXME: The type of the output ports is set to XmlTOken for now.
 It should ???.</p>

 @author Yang Zhao
 @version $Id$
 @since Ptolemy II 4.0
 @Pt.ProposedRating Red (liuj)
 @Pt.AcceptedRating Red (liuj)
 */
public class StringToXML extends Transformer {
    /** Construct an actor with the given container and name.
     *  @param container The container.
     *  @param name The name of this actor.
     *  @exception IllegalActionException If the actor cannot be contained
     *   by the proposed container.
     *  @exception NameDuplicationException If the container already has an
     *   actor with this name.
     */
    public StringToXML(CompositeEntity container, String name)
            throws IllegalActionException, NameDuplicationException {
        super(container, name);

        // Set the type of the input port.
        input.setMultiport(true);
        input.setTypeEquals(BaseType.STRING);

        // Set the type of the output port.
        output.setMultiport(true);
        output.setTypeEquals(BaseType.XMLTOKEN);
    }

    ///////////////////////////////////////////////////////////////////
    ////                         public methods                    ////

    /** Output the XMLToken constructed from the input string.
     *  @exception IllegalActionException if the superclass throws it..
     */
    public void fire() throws IllegalActionException {
        super.fire();
        //int k = 0;
        for (int i = 0; i < input.getWidth(); i++) {
            if (input.hasToken(i)) {
                StringToken in = (StringToken) input.get(i);

                try {
                    _outToken = new XMLToken(in.stringValue());
                    output.broadcast(_outToken);

                    //k++;
                } catch (java.lang.Exception ex) {
                    throw new IllegalActionException(this, ex,
                            "Can't construct an XML Token from '" + in + "'");
                }
            }
        }

        /*//for test purpose, use the following code when fire.
         String in = "<?xml version='1.0' encoding='UTF-8'?> <Actors>" +
         "<Actor> <name>Const</name> <class>ptolemy.actor.lib.Const</class>"
         + " </Actor> </Actors>";
         try {
         //_outToken = new XmlToken[1];
         _outToken = new XmlToken(in);

         }
         catch (Exception e) {
         e.printStackTrace();
         System.out.println("exception is " + e.getClass());
         System.out.println("### can't construct an XmlToken from: "
         + in + "\n");
         throw new IllegalActionException(this, e.getMessage());
         }
         output.broadcast(_outToken); */
    }

    /** Return true if there is token at the <i>input</i> input.
     *  Otherwise, return false.
     *  @exception IllegalActionException if the superclass throws it.
     */
    public boolean prefire() throws IllegalActionException {
        for (int i = 0; i < input.getWidth(); i++) {
            if (input.hasToken(i)) {
                return true;
            }
        }

        return false;
    }

    ///////////////////////////////////////////////////////////////////
    ////                         private members                   ////
    private XMLToken _outToken;
}