/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/**

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements. See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership. The ASF licenses this file

 * to you 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.Canonicalizer20010315ExclOmitComments;

import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;

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;

import com.sun.org.apache.xml.internal.security.transforms.params.InclusiveNamespaces;

import com.sun.org.apache.xml.internal.security.utils.XMLUtils;

import org.w3c.dom.Element;

/**

 * Class TransformC14NExclusive

 *

 */

public class TransformC14NExclusive extends TransformSpi {

    /** Field implementedTransformURI */

    public static final String implementedTransformURI =

        Transforms.TRANSFORM_C14N_EXCL_OMIT_COMMENTS;

    /**

     * Method engineGetURI

     *

     * {@inheritDoc}

     */

    protected String engineGetURI() {

        return implementedTransformURI;

    }

    protected XMLSignatureInput enginePerformTransform(

        XMLSignatureInput input, OutputStream os, Transform transformObject

    ) throws CanonicalizationException {

        try {

            String inclusiveNamespaces = null;

            if (transformObject.length(

                InclusiveNamespaces.ExclusiveCanonicalizationNamespace,

                InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES) == 1

            ) {

                Element inclusiveElement =

                    XMLUtils.selectNode(

                        transformObject.getElement().getFirstChild(),

                        InclusiveNamespaces.ExclusiveCanonicalizationNamespace,

                        InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES,

                        0

                    );

                inclusiveNamespaces =

                    new InclusiveNamespaces(

                        inclusiveElement, transformObject.getBaseURI()).getInclusiveNamespaces();

            }

            Canonicalizer20010315ExclOmitComments c14n =

                new Canonicalizer20010315ExclOmitComments();

            c14n.setSecureValidation(secureValidation);

            if (os != null) {

                c14n.setWriter(os);

            }

            byte[] result = c14n.engineCanonicalize(input, inclusiveNamespaces);

            XMLSignatureInput output = new XMLSignatureInput(result);

            output.setSecureValidation(secureValidation);

            if (os != null) {

                output.setOutputStream(os);

            }

            return output;

        } catch (XMLSecurityException ex) {

            throw new CanonicalizationException(ex);

        }

    }

}