001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  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    package org.apache.commons.functor.example.lines;
018    
019    import org.apache.commons.functor.BinaryFunction;
020    
021    /**
022     * @version $Revision: 665786 $ $Date: 2008-06-09 19:17:39 +0200 (Mon, 09 Jun 2008) $
023     * @author Rodney Waldhoff
024     */
025    public class Sum implements BinaryFunction<Number, Number, Integer> {
026        public Integer evaluate(Number left, Number right) {
027            return left.intValue() + right.intValue();
028        }
029    
030        public static final Sum instance() {
031            return INSTANCE;
032        }
033    
034        private static final Sum INSTANCE = new Sum();
035    }