/**
 * 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 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id$
 */
package org.apache.jcp.xml.dsig.internal.dom;

import java.security.InvalidAlgorithmParameterException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import javax.xml.crypto.*;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;
import javax.xml.crypto.dsig.spec.XSLTTransformParameterSpec;

/**
 * DOM-based implementation of XSLT Transform.
 * (Uses Apache XML-Sec Transform implementation)
 *
 */
public final class DOMXSLTTransform extends ApacheTransform {

    @Override
    public void init(TransformParameterSpec params)
        throws InvalidAlgorithmParameterException {
        if (params == null) {
            throw new InvalidAlgorithmParameterException("params are required");
        }
        if (!(params instanceof XSLTTransformParameterSpec)) {
            throw new InvalidAlgorithmParameterException("unrecognized params");
        }
        this.params = params;
    }

    public void init(XMLStructure parent, XMLCryptoContext context)
        throws InvalidAlgorithmParameterException {

        super.init(parent, context);
        unmarshalParams(DOMUtils.getFirstChildElement(transformElem));
    }

    private void unmarshalParams(Element sheet) {
        this.params = new XSLTTransformParameterSpec
            (new javax.xml.crypto.dom.DOMStructure(sheet));
    }

    public void marshalParams(XMLStructure parent, XMLCryptoContext context)
        throws MarshalException {
        super.marshalParams(parent, context);
        XSLTTransformParameterSpec xp =
            (XSLTTransformParameterSpec) getParameterSpec();
        Node xsltElem =
            ((javax.xml.crypto.dom.DOMStructure) xp.getStylesheet()).getNode();
        DOMUtils.appendChild(transformElem, xsltElem);
    }
}