/*
 * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
/*
 * $Id: DOMXSLTTransform.java,v 1.15 2005/05/10 18:15:36 mullan Exp $
 */
package org.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.*;
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)
 *
 * @author Sean Mullan
 */
public final class DOMXSLTTransform extends ApacheTransform {

    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);
    }
}