src/java.xml.crypto/share/classes/com/sun/org/apache/xml/internal/security/transforms/implementations/TransformC14N.java

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/**
 * 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
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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.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/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;
    }

    protected XMLSignatureInput enginePerformTransform(
        XMLSignatureInput input, OutputStream os, Transform transformObject
    ) throws CanonicalizationException {
        Canonicalizer20010315OmitComments c14n = new Canonicalizer20010315OmitComments();
        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;
    }
}