/*
 * Copyright  1999-2004 The Apache Software Foundation.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.xml.security.transforms.implementations;

import java.io.OutputStream;

import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.implementations.Canonicalizer20010315WithComments;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.transforms.Transform;
import org.apache.xml.security.transforms.TransformSpi;
import org.apache.xml.security.transforms.Transforms;

/**
 * Implements the <CODE>http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments</CODE>
 * transform.
 *
 * @author Christian Geuer-Pollmann
 */
public class TransformC14NWithComments extends TransformSpi {

   /** Field implementedTransformURI */
   public static final String implementedTransformURI =
      Transforms.TRANSFORM_C14N_WITH_COMMENTS;

   /** @inheritDoc */
   protected String engineGetURI() {
      return implementedTransformURI;
   }

   /** @inheritDoc */
   protected XMLSignatureInput enginePerformTransform
	(XMLSignatureInput input, Transform _transformObject)
   	throws CanonicalizationException {
   	    return enginePerformTransform(input, null, _transformObject);
   }

   /** @inheritDoc */
   protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input,OutputStream os, Transform _transformObject)
           throws CanonicalizationException {
      
        Canonicalizer20010315WithComments c14n = new Canonicalizer20010315WithComments();
        if (os!=null) {
        	c14n.setWriter( os);
        }
        
         byte[] result = null;
         result=c14n.engineCanonicalize(input);         		         	         
         XMLSignatureInput output=new XMLSignatureInput(result);         
         if (os!=null) {
         	output.setOutputStream(os);
         }
         return output;      
   }
}
