001/**
002 *
003 * Copyright © 2014-2021 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.util;
018
019import java.util.Collection;
020
021import org.jivesoftware.smack.packet.XmlElement;
022
023public class PacketUtil {
024
025    /**
026     * Get a extension element from a collection.
027     *
028     * @param collection Collection of ExtensionElements.
029     * @param element name of the targeted ExtensionElement.
030     * @param namespace namespace of the targeted ExtensionElement.
031     * @param <PE> Type of the ExtensionElement
032     *
033     * @return the extension element
034     */
035    @SuppressWarnings("unchecked")
036    public static <PE extends XmlElement> PE extensionElementFrom(Collection<XmlElement> collection,
037                    String element, String namespace) {
038        for (XmlElement packetExtension : collection) {
039            if ((element == null || packetExtension.getElementName().equals(
040                            element))
041                            && packetExtension.getNamespace().equals(namespace)) {
042                return (PE) packetExtension;
043            }
044        }
045        return null;
046    }
047}