001/**
002 *
003 * Copyright 2003-2007 Jive Software, 2024 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 */
017
018package org.jivesoftware.smack.filter;
019
020import org.jivesoftware.smack.packet.ExtensionElement;
021import org.jivesoftware.smack.packet.Stanza;
022import org.jivesoftware.smack.util.Objects;
023
024/**
025 * Implements the logical NOT operation on a stanza filter. In other words, packets
026 * pass this filter if they do not pass the supplied filter.
027 *
028 * @author Matt Tucker
029 */
030public class NotFilter implements StanzaFilter {
031
032    private final StanzaFilter filter;
033
034    /**
035     * Creates a NOT filter using the specified filter.
036     *
037     * @param filter the filter.
038     */
039    public NotFilter(StanzaFilter filter) {
040        this.filter = Objects.requireNonNull(filter, "Parameter must not be null.");
041    }
042
043    @Override
044    public boolean accept(Stanza packet) {
045        return !filter.accept(packet);
046    }
047
048    public static <E extends ExtensionElement> NotFilter of(Class<E> extensionElementClass) {
049        ExtensionElementFilter<E> extensionElementFilter = new ExtensionElementFilter<>(extensionElementClass);
050        return new NotFilter(extensionElementFilter);
051    }
052}