1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.functor.example.kata.one; 18 19 import org.apache.commons.functor.UnaryFunction; 20 import org.apache.commons.functor.adapter.LeftBoundFunction; 21 22 /** 23 * @version $Revision: 665786 $ $Date: 2008-06-09 19:17:39 +0200 (Mon, 09 Jun 2008) $ 24 * @author Rodney Waldhoff 25 */ 26 public class Multiply extends ArithmeticOperation { 27 28 public Number evaluate(Number left, Number right) { 29 return new Integer(left.intValue() * right.intValue()); 30 } 31 32 public static Multiply instance() { 33 return INSTANCE; 34 } 35 36 public static UnaryFunction<Number, Number> by(int factor) { 37 return LeftBoundFunction.bind(INSTANCE, factor); 38 } 39 40 private static Multiply INSTANCE = new Multiply(); 41 }