001    /*
002     * Copyright 2002-2004 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 org.springframework.rules.constraint;
017    
018    import org.springframework.core.enums.StringCodedLabeledEnum;
019    
020    /**
021     * @author Keith Donald
022     */
023    public abstract class Operator extends StringCodedLabeledEnum {
024    
025            protected Operator(String code, String symbol) {
026                    super(code, symbol);
027            }
028    
029            public String getSymbol() {
030                    return getLabel();
031            }
032    
033            public Operator negation() {
034                    return null;
035            }
036            
037            public String toString() {
038                    return getSymbol();
039            }
040    }