/*

 * 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.

 */

/*

 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.

 */

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.Attr;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

/**

 * DOM-based implementation of SignatureProperties.

 *

 */

public final class DOMSignatureProperties extends DOMStructure

    implements SignatureProperties {

    private final String id;

    private final List<SignatureProperty> properties;

    /**

     * Creates a {@code DOMSignatureProperties} 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})

     * @throws ClassCastException if {@code properties} contains any

     *    entries that are not of type {@link SignatureProperty}

     * @throws IllegalArgumentException if {@code properties} is empty

     * @throws NullPointerException if {@code properties}

     */

    public DOMSignatureProperties(List<? extends SignatureProperty> 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 {

            this.properties = Collections.unmodifiableList(

                new ArrayList<>(properties));

            for (int i = 0, size = this.properties.size(); i < size; i++) {

                if (!(this.properties.get(i) instanceof SignatureProperty)) {

                    throw new ClassCastException

                        ("properties["+i+"] is not a valid type");

                }

            }

        }

        this.id = id;

    }

    /**

     * Creates a {@code DOMSignatureProperties} from an element.

     *

     * @param propsElem a SignatureProperties element

     * @throws MarshalException if a marshalling error occurs

     */

    public DOMSignatureProperties(Element propsElem)

        throws MarshalException

    {

        // unmarshal attributes

        Attr attr = propsElem.getAttributeNodeNS(null, "Id");

        if (attr != null) {

            id = attr.getValue();

            propsElem.setIdAttributeNode(attr, true);

        } else {

            id = null;

        }

        List<SignatureProperty> newProperties = new ArrayList<>();

        Node firstChild = propsElem.getFirstChild();

        while (firstChild != null) {

            if (firstChild.getNodeType() == Node.ELEMENT_NODE) {

                String name = firstChild.getLocalName();

                String namespace = firstChild.getNamespaceURI();

                if (!"SignatureProperty".equals(name) || !XMLSignature.XMLNS.equals(namespace)) {

                    throw new MarshalException("Invalid element name: " + namespace + ":" + name +

                                               ", expected SignatureProperty");

                }

                newProperties.add(new DOMSignatureProperty((Element)firstChild));

            }

            firstChild = firstChild.getNextSibling();

        }

        if (newProperties.isEmpty()) {

            throw new MarshalException("properties cannot be empty");

        } else {

            this.properties = Collections.unmodifiableList(newProperties);

        }

    }

    public List<SignatureProperty> getProperties() {

        return properties;

    }

    public String getId() {

        return id;

    }

    @Override

    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 (SignatureProperty property : properties) {

            ((DOMSignatureProperty)property).marshal(propsElem, dsPrefix,

                                                     context);

        }

        parent.appendChild(propsElem);

    }

    @Override

    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;

    }

    @Override

    public int hashCode() {

        int result = 17;

        if (id != null) {

            result = 31 * result + id.hashCode();

        }

        result = 31 * result + properties.hashCode();

        return result;

    }

}