/* An actor that converts a string to an array of bytes.
Copyright (c) 1998-2006 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.data.ArrayToken;
import ptolemy.data.StringToken;
import ptolemy.data.Token;
import ptolemy.data.UnsignedByteToken;
import ptolemy.data.type.ArrayType;
import ptolemy.data.type.BaseType;
import ptolemy.kernel.CompositeEntity;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
///////////////////////////////////////////////////////////////
/// StringToUnsignedByteArray
/**
Convert a string to an array of unsigned byte. The conversion is performed
using the default character set, returned by the system property
"file.encoding".
@author Winthrop Williams, Steve Neuendorffer
@version $Id$
@since Ptolemy II 2.0
@Pt.ProposedRating Red (winthrop)
@Pt.AcceptedRating Red (winthrop)
*/
public class StringToUnsignedByteArray extends Converter {
/** 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 StringToUnsignedByteArray(CompositeEntity container, String name)
throws NameDuplicationException, IllegalActionException {
super(container, name);
input.setTypeEquals(BaseType.STRING);
output.setTypeEquals(new ArrayType(BaseType.UNSIGNED_BYTE));
}
///////////////////////////////////////////////////////////////////
//// public methods ////
/** Consume one string token on the input port and output a new array
* token of integer tokens on the output port. The low byte of each
* integer is the byte form of one of the characters. The other
* three bytes of each integer may be 0x000000 or 0xFFFFFF. The
* first character of the string is copied to the first element of
* the array, and so on. NOTE: Assumes an 8-bit character set is
* the default setting for this implementation of Java.
*
* @exception IllegalActionException If there is no director.
* FIXME: Does this method actually check if there is a director?
*/
public void fire() throws IllegalActionException {
super.fire();
String inputValue = ((StringToken) input.get(0)).stringValue();
byte[] dataBytes = inputValue.getBytes();
int bytesAvailable = dataBytes.length;
Token[] dataTokens = new Token[bytesAvailable];
for (int j = 0; j < bytesAvailable; j++) {
dataTokens[j] = new UnsignedByteToken(dataBytes[j]);
}
output.send(0, new ArrayToken(BaseType.UNSIGNED_BYTE, dataTokens));
}
/** Return false if the input port has no token, otherwise return
* what the superclass returns (presumably true).
* @exception IllegalActionException If there is no director.
*/
public boolean prefire() throws IllegalActionException {
if (!input.hasToken(0)) {
return false;
}
return super.prefire();
}
}