/*
 * Copyright 2008 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.Canonicalizer11_OmitComments;
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/2006/12/xml-c14n11</CODE>
 * (C14N 1.1) transform.
 *
 * @author Sean Mullan
 */
public class TransformC14N11 extends TransformSpi {

    protected String engineGetURI() {
	return Transforms.TRANSFORM_C14N11_OMIT_COMMENTS;
    }

    protected XMLSignatureInput enginePerformTransform
	(XMLSignatureInput input, Transform transform)
	throws CanonicalizationException {
	return enginePerformTransform(input, null, transform);
    }

    protected XMLSignatureInput enginePerformTransform
	(XMLSignatureInput input, OutputStream os, Transform transform)
	throws CanonicalizationException {   
        Canonicalizer11_OmitComments c14n = new Canonicalizer11_OmitComments();
        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;     
    }
}
