https://openjdk.java.net/ 
/*
 * 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.

/**
 * 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.
 */
/*
 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * $Id: DOMTransform.java 1333415 2012-05-03 12:03:51Z coheigea $
 */
package org.jcp.xml.dsig.internal.dom;

import java.io.OutputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.spec.AlgorithmParameterSpec;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import javax.xml.crypto.*;
import javax.xml.crypto.dsig.*;
import javax.xml.crypto.dom.DOMCryptoContext;
import javax.xml.crypto.dsig.dom.DOMSignContext;


DOM-based abstract implementation of Transform.

Author:Sean Mullan
/**
 * DOM-based abstract implementation of Transform.
 *
 * @author Sean Mullan
 */
public class DOMTransform extends DOMStructure implements Transform {

    protected TransformService spi;

    
Creates a DOMTransform.

Params:
  • spi – the TransformService
/**
     * Creates a <code>DOMTransform</code>.
     *
     * @param spi the TransformService
     */
    public DOMTransform(TransformService spi) {
        this.spi = spi;
    }

    
Creates a DOMTransform from an element. This constructor invokes the abstract unmarshalParams method to unmarshal any algorithm-specific input parameters. 
Params:
  • transElem – a Transform element
/**
     * Creates a <code>DOMTransform</code> from an element. This constructor
     * invokes the abstract {@link #unmarshalParams unmarshalParams} method to
     * unmarshal any algorithm-specific input parameters.
     *
     * @param transElem a Transform element
     */
    public DOMTransform(Element transElem, XMLCryptoContext context,
                        Provider provider)
        throws MarshalException
    {
        String algorithm = DOMUtils.getAttributeValue(transElem, "Algorithm");

        if (provider == null) {
            try {
                spi = TransformService.getInstance(algorithm, "DOM");
            } catch (NoSuchAlgorithmException e1) {
                throw new MarshalException(e1);
            }
        } else {
            try {
                spi = TransformService.getInstance(algorithm, "DOM", provider);
            } catch (NoSuchAlgorithmException nsae) {
                try {
                    spi = TransformService.getInstance(algorithm, "DOM");
                } catch (NoSuchAlgorithmException e2) {
                    throw new MarshalException(e2);
                }
            }
        }
        try {
            spi.init(new javax.xml.crypto.dom.DOMStructure(transElem), context);
        } catch (InvalidAlgorithmParameterException iape) {
            throw new MarshalException(iape);
        }
    }

    public final AlgorithmParameterSpec getParameterSpec() {
        return spi.getParameterSpec();
    }

    public final String getAlgorithm() {
        return spi.getAlgorithm();
    }

    
This method invokes the abstract marshalParams method to marshal any algorithm-specific parameters. 
/**
     * This method invokes the abstract {@link #marshalParams marshalParams}
     * method to marshal any algorithm-specific parameters.
     */
    public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
        throws MarshalException
    {
        Document ownerDoc = DOMUtils.getOwnerDocument(parent);

        Element transformElem = null;
        if (parent.getLocalName().equals("Transforms")) {
            transformElem = DOMUtils.createElement(ownerDoc, "Transform",
                                                   XMLSignature.XMLNS,
                                                   dsPrefix);
        } else {
            transformElem = DOMUtils.createElement(ownerDoc,
                                                   "CanonicalizationMethod",
                                                   XMLSignature.XMLNS,
                                                   dsPrefix);
        }
        DOMUtils.setAttribute(transformElem, "Algorithm", getAlgorithm());

        spi.marshalParams(new javax.xml.crypto.dom.DOMStructure(transformElem),
                          context);

        parent.appendChild(transformElem);
    }

    
Transforms the specified data using the underlying transform algorithm.

Params:
  • data – the data to be transformed
  • sc – the XMLCryptoContext containing
   additional context (may be null if not applicable)
Throws:
Returns:the transformed data
/**
     * Transforms the specified data using the underlying transform algorithm.
     *
     * @param data the data to be transformed
     * @param sc the <code>XMLCryptoContext</code> containing
     *    additional context (may be <code>null</code> if not applicable)
     * @return the transformed data
     * @throws NullPointerException if <code>data</code> is <code>null</code>
     * @throws XMLSignatureException if an unexpected error occurs while
     *    executing the transform
     */
    public Data transform(Data data, XMLCryptoContext xc)
        throws TransformException
    {
        return spi.transform(data, xc);
    }

    
Transforms the specified data using the underlying transform algorithm.

Params:
  • data – the data to be transformed
  • sc – the XMLCryptoContext containing
   additional context (may be null if not applicable)
  • os – the OutputStream that should be used to write
   the transformed data to
Throws:
Returns:the transformed data
/**
     * Transforms the specified data using the underlying transform algorithm.
     *
     * @param data the data to be transformed
     * @param sc the <code>XMLCryptoContext</code> containing
     *    additional context (may be <code>null</code> if not applicable)
     * @param os the <code>OutputStream</code> that should be used to write
     *    the transformed data to
     * @return the transformed data
     * @throws NullPointerException if <code>data</code> is <code>null</code>
     * @throws XMLSignatureException if an unexpected error occurs while
     *    executing the transform
     */
    public Data transform(Data data, XMLCryptoContext xc, OutputStream os)
        throws TransformException
    {
        return spi.transform(data, xc, os);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (!(o instanceof Transform)) {
            return false;
        }
        Transform otransform = (Transform)o;

        return (getAlgorithm().equals(otransform.getAlgorithm()) &&
                DOMUtils.paramsEqual(getParameterSpec(),
                                     otransform.getParameterSpec()));
    }

    @Override
    public int hashCode() {
        int result = 17;
        result = 31 * result + getAlgorithm().hashCode();
        AlgorithmParameterSpec spec = getParameterSpec();
        if (spec != null) {
            result = 31 * result + spec.hashCode();
        }

        return result;
    }

    
Transforms the specified data using the underlying transform algorithm. This method invokes the marshal method and passes it the specified DOMSignContext before transforming the data.

Params:
  • data – the data to be transformed
  • sc – the XMLCryptoContext containing
   additional context (may be null if not applicable)
  • context – the marshalling context
Throws:
Returns:the transformed data
/**
     * Transforms the specified data using the underlying transform algorithm.
     * This method invokes the {@link #marshal marshal} method and passes it
     * the specified <code>DOMSignContext</code> before transforming the data.
     *
     * @param data the data to be transformed
     * @param sc the <code>XMLCryptoContext</code> containing
     *    additional context (may be <code>null</code> if not applicable)
     * @param context the marshalling context
     * @return the transformed data
     * @throws MarshalException if an exception occurs while marshalling
     * @throws NullPointerException if <code>data</code> or <code>context</code>
     *    is <code>null</code>
     * @throws XMLSignatureException if an unexpected error occurs while
     *    executing the transform
     */
    Data transform(Data data, XMLCryptoContext xc, DOMSignContext context)
        throws MarshalException, TransformException
    {
        marshal(context.getParent(),
                DOMUtils.getSignaturePrefix(context), context);
        return transform(data, xc);
    }
}