001    /*
002     * Copyright 2010 the original author or authors.
003     * 
004     *  Licensed under the Apache License, Version 2.0 (the "License");
005     *  you may not use this file except in compliance with the License.
006     *  You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     *  Unless required by applicable law or agreed to in writing, software
011     *  distributed under the License is distributed on an "AS IS" BASIS,
012     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     *  See the License for the specific language governing permissions and
014     *  limitations under the License.
015     */
016    package com.hs.mail.imap.message.search;
017    
018    /**
019     * This class implements the logical NEGATION operator.
020     * 
021     * @author Won Chul Doh
022     * @since Jan 30, 2010
023     * 
024     */
025    public final class NotKey extends SearchKey {
026    
027            protected SearchKey key;
028    
029            public NotKey(SearchKey k) {
030                    key = k;
031            }
032    
033            public SearchKey getSearchKey() {
034                    return key;
035            }
036    
037            public boolean equals(Object obj) {
038                    if (!(obj instanceof NotKey))
039                            return false;
040                    NotKey nk = (NotKey) obj;
041                    return nk.key.equals(this.key);
042            }
043    
044            public int hashCode() {
045                    return key.hashCode() << 1;
046            }
047    
048            @Override
049            public boolean isComposite() {
050                    return true;
051            }
052    
053    }