/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * 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 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.Canonicalizer11_WithComments;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.transforms.Transform;
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/2006/12/xml-c14n-11#WithComments</CODE>
 * (C14N 1.1 With Comments) transform.
 *
 * @author Sean Mullan
 */
public class TransformC14N11_WithComments extends TransformSpi {

    protected String engineGetURI() {
        return Transforms.TRANSFORM_C14N11_WITH_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_WithComments c14n = new Canonicalizer11_WithComments();
        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;
    }
}
