/*
 * 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: DOMSignatureProperties.java,v 1.12 2005/05/12 19:28:32 mullan Exp $
 */
package org.jcp.xml.dsig.internal.dom;

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

import java.util.*;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * DOM-based implementation of SignatureProperties.
 *
 * @author Sean Mullan
 */
public final class DOMSignatureProperties extends DOMStructure
    implements SignatureProperties {

    private final String id;
    private final List properties;

    /**
     * Creates a <code>DOMSignatureProperties</code> from the specified
     * parameters.
     *
     * @param properties a list of one or more {@link SignatureProperty}s. The
     *    list is defensively copied to protect against subsequent modification.
     * @param id the Id (may be <code>null</code>)
     * @return a <code>DOMSignatureProperties</code>
     * @throws ClassCastException if <code>properties</code> contains any
     *    entries that are not of type {@link SignatureProperty}
     * @throws IllegalArgumentException if <code>properties</code> is empty
     * @throws NullPointerException if <code>properties</code>
     */
    public DOMSignatureProperties(List properties, String id) {
        if (properties == null) {
            throw new NullPointerException("properties cannot be null");
        } else if (properties.isEmpty()) {
            throw new IllegalArgumentException("properties cannot be empty");
        } else {
            List propsCopy = new ArrayList(properties);
            for (int i = 0, size = propsCopy.size(); i < size; i++) {
                if (!(propsCopy.get(i) instanceof SignatureProperty)) {
                    throw new ClassCastException
                        ("properties["+i+"] is not a valid type");
                }
            }
            this.properties = Collections.unmodifiableList(propsCopy);
        }
        this.id = id;
    }

    /**
     * Creates a <code>DOMSignatureProperties</code> from an element.
     *
     * @param propsElem a SignatureProperties element
     * @throws MarshalException if a marshalling error occurs
     */
    public DOMSignatureProperties(Element propsElem) throws MarshalException{
        // unmarshal attributes
        id = DOMUtils.getAttributeValue(propsElem, "Id");

        NodeList nodes = propsElem.getChildNodes();
        int length = nodes.getLength();
        List properties = new ArrayList(length);
        for (int i = 0; i < length; i++) {
            Node child = nodes.item(i);
            if (child.getNodeType() == Node.ELEMENT_NODE) {
                properties.add(new DOMSignatureProperty((Element) child));
            }
        }
        if (properties.isEmpty()) {
            throw new MarshalException("properties cannot be empty");
        } else {
            this.properties = Collections.unmodifiableList(properties);
        }
    }

    public List getProperties() {
        return properties;
    }

    public String getId() {
        return id;
    }

    public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
        throws MarshalException {
        Document ownerDoc = DOMUtils.getOwnerDocument(parent);

        Element propsElem = DOMUtils.createElement
            (ownerDoc, "SignatureProperties", XMLSignature.XMLNS, dsPrefix);

        // set attributes
        DOMUtils.setAttributeID(propsElem, "Id", id);

        // create and append any properties
        for (int i = 0, size = properties.size(); i < size; i++) {
            DOMSignatureProperty property =
                (DOMSignatureProperty) properties.get(i);
            property.marshal(propsElem, dsPrefix, context);
        }

        parent.appendChild(propsElem);
    }

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

        if (!(o instanceof SignatureProperties)) {
            return false;
        }
        SignatureProperties osp = (SignatureProperties) o;

        boolean idsEqual = (id == null ? osp.getId() == null :
            id.equals(osp.getId()));

        return (properties.equals(osp.getProperties()) && idsEqual);
    }
}