76 lines
2.8 KiB
Java
76 lines
2.8 KiB
Java
/**
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*
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* Copyright 2018-2019 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.logging.Logger;
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import javax.xml.namespace.QName;
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import org.jivesoftware.smack.packet.FullyQualifiedElement;
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public class XmppElementUtil {
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public static final Logger LOGGER = Logger.getLogger(XmppElementUtil.class.getName());
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public static QName getQNameFor(Class<? extends FullyQualifiedElement> fullyQualifiedElement) {
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try {
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Object qnameObject = fullyQualifiedElement.getField("QNAME").get(null);
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if (QName.class.isAssignableFrom(qnameObject.getClass())) {
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return (QName) qnameObject;
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}
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LOGGER.warning("The QNAME field of " + fullyQualifiedElement + " is not of type QNAME.");
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} catch (NoSuchFieldException e) {
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LOGGER.finer("The class " + fullyQualifiedElement + " has no static QNAME field. Consider adding one.");
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// Proceed to fallback strategy.
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} catch (IllegalArgumentException | IllegalAccessException | SecurityException e) {
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throw new IllegalArgumentException(e);
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}
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String element, namespace;
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try {
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element = (String) fullyQualifiedElement.getField("ELEMENT").get(null);
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namespace = (String) fullyQualifiedElement.getField("NAMESPACE").get(null);
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}
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catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException e) {
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throw new IllegalArgumentException(e);
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}
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return new QName(namespace, element);
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}
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public static <E extends FullyQualifiedElement, R extends FullyQualifiedElement> List<R> getElementsFrom(
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MultiMap<QName, E> elementMap, Class<R> extensionElementClass) {
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QName qname = XmppElementUtil.getQNameFor(extensionElementClass);
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List<E> extensionElements = elementMap.getAll(qname);
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if (extensionElements.isEmpty()) {
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return Collections.emptyList();
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}
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List<R> res = new ArrayList<>(extensionElements.size());
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for (E extensionElement : extensionElements) {
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R e = extensionElementClass.cast(extensionElement);
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res.add(e);
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}
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return res;
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}
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}
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