Package com.sun.org.apache.xml.internal.security.transforms.implementations

Source Code of com.sun.org.apache.xml.internal.security.transforms.implementations.TransformC14N

/*
* 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 com.sun.org.apache.xml.internal.security.transforms.implementations;



import java.io.OutputStream;

import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException;
import com.sun.org.apache.xml.internal.security.c14n.implementations.Canonicalizer20010315OmitComments;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.transforms.TransformSpi;
import com.sun.org.apache.xml.internal.security.transforms.Transforms;


/**
* Implements the <CODE>http://www.w3.org/TR/2001/REC-xml-c14n-20010315</CODE>
* transform.
*
* @author Christian Geuer-Pollmann
*/
public class TransformC14N extends TransformSpi {

   /** Field implementedTransformURI */
   public static final String implementedTransformURI =
      Transforms.TRANSFORM_C14N_OMIT_COMMENTS;


   /**
    * @inheritDoc
    */
   protected String engineGetURI() {
      return TransformC14N.implementedTransformURI;
   }

   /**
    *  @inheritDoc
    */
   protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input)
           throws CanonicalizationException {
         return enginePerformTransform(input,null);
   }
    protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input,OutputStream os)
    throws CanonicalizationException {  
         Canonicalizer20010315OmitComments c14n = new Canonicalizer20010315OmitComments();
         if (os!=null) {
           c14n.setWriter(os);
         }
         byte[] result = null;               
         input.setNeedsToBeExpanded(true);
         result=c14n.engineCanonicalize(input);                                
         XMLSignatureInput output=new XMLSignatureInput(result);
         if (os!=null) {
            output.setOutputStream(os);
         }
         return output;    
   }
}
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