/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2005 The Apache Software Foundation.
 *
 *  Licensed 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: DOMManifest.java,v 1.2 2008/07/24 15:20:32 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.security.Provider;
import java.util.*;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

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

    private final List references;
    private final String id;

    /**
     * Creates a <code>DOMManifest</code> containing the specified
     * list of {@link Reference}s and optional id.
     *
     * @param references a list of one or more <code>Reference</code>s. The list
     *    is defensively copied to protect against subsequent modification.
     * @param id the id (may be <code>null</code>
     * @throws NullPointerException if <code>references</code> is
     *    <code>null</code>
     * @throws IllegalArgumentException if <code>references</code> is empty
     * @throws ClassCastException if <code>references</code> contains any
     *    entries that are not of type {@link Reference}
     */
    public DOMManifest(List references, String id) {
        if (references == null) {
            throw new NullPointerException("references cannot be null");
        }
        List refCopy = new ArrayList(references);
        if (refCopy.isEmpty()) {
            throw new IllegalArgumentException("list of references must " +
                "contain at least one entry");
        }
        for (int i = 0, size = refCopy.size(); i < size; i++) {
            if (!(refCopy.get(i) instanceof Reference)) {
                throw new ClassCastException
                    ("references["+i+"] is not a valid type");
            }
        }
        this.references = Collections.unmodifiableList(refCopy);
        this.id = id;
    }

    /**
     * Creates a <code>DOMManifest</code> from an element.
     *
     * @param manElem a Manifest element
     */
    public DOMManifest(Element manElem, XMLCryptoContext context,
        Provider provider) throws MarshalException {
        Attr attr = manElem.getAttributeNodeNS(null, "Id");
        if (attr != null) {
            this.id = attr.getValue();
            manElem.setIdAttributeNode(attr, true);
        } else {
            this.id = null;
        }

        boolean secVal = Utils.secureValidation(context);
        Element refElem = DOMUtils.getFirstChildElement(manElem);
        List refs = new ArrayList();
        int refCount = 0;
        while (refElem != null) {
            refs.add(new DOMReference(refElem, context, provider));
            refElem = DOMUtils.getNextSiblingElement(refElem);

            refCount++;
            if (secVal && (refCount > DOMSignedInfo.MAXIMUM_REFERENCE_COUNT)) {
                String error = "A maxiumum of " +
                               DOMSignedInfo.MAXIMUM_REFERENCE_COUNT +
                               " references per Manifest are allowed with" +
                               " secure validation";
                throw new MarshalException(error);
            }
        }
        this.references = Collections.unmodifiableList(refs);
    }

    public String getId() {
        return id;
    }

    public List getReferences() {
        return references;
    }

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

        Element manElem = DOMUtils.createElement
            (ownerDoc, "Manifest", XMLSignature.XMLNS, dsPrefix);

        DOMUtils.setAttributeID(manElem, "Id", id);

        // add references
        for (int i = 0, size = references.size(); i < size; i++) {
            DOMReference ref = (DOMReference) references.get(i);
            ref.marshal(manElem, dsPrefix, context);
        }
        parent.appendChild(manElem);
    }

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

        if (!(o instanceof Manifest)) {
            return false;
        }
        Manifest oman = (Manifest) o;

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

        return (idsEqual && references.equals(oman.getReferences()));
    }
}