| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| BinaryFunctionUnaryFunction |
|
| 1.8571428571428572;1.857 |
| 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.adapter; | |
| 18 | ||
| 19 | import org.apache.commons.functor.BinaryFunction; | |
| 20 | import org.apache.commons.functor.UnaryFunction; | |
| 21 | ||
| 22 | /** | |
| 23 | * Adapts a BinaryFunction as a UnaryFunction by sending the same argument to both sides of the BinaryFunction. | |
| 24 | * It sounds nonsensical, but using Composite functions, can be made to do something useful. | |
| 25 | * @param <A> the argument type. | |
| 26 | * @param <T> the returned value type. | |
| 27 | * @version $Revision: 1156765 $ $Date: 2011-08-11 21:37:08 +0200 (Thu, 11 Aug 2011) $ | |
| 28 | * @author Rodney Waldhoff | |
| 29 | */ | |
| 30 | public final class BinaryFunctionUnaryFunction<A, T> implements UnaryFunction<A, T> { | |
| 31 | /** | |
| 32 | * The adapted function. | |
| 33 | */ | |
| 34 | private final BinaryFunction<? super A, ? super A, ? extends T> function; | |
| 35 | ||
| 36 | /** | |
| 37 | * Create a new BinaryFunctionUnaryFunction. | |
| 38 | * @param function to adapt | |
| 39 | */ | |
| 40 | 28 | public BinaryFunctionUnaryFunction(BinaryFunction<? super A, ? super A, ? extends T> function) { |
| 41 | 28 | if (null == function) { |
| 42 | 0 | throw new IllegalArgumentException("BinaryFunction argument was null"); |
| 43 | } | |
| 44 | 28 | this.function = function; |
| 45 | 28 | } |
| 46 | ||
| 47 | /** | |
| 48 | * {@inheritDoc} | |
| 49 | */ | |
| 50 | public T evaluate(A obj) { | |
| 51 | 196 | return function.evaluate(obj, obj); |
| 52 | } | |
| 53 | ||
| 54 | /** | |
| 55 | * {@inheritDoc} | |
| 56 | */ | |
| 57 | @Override | |
| 58 | public boolean equals(Object obj) { | |
| 59 | 20 | return obj == this || obj instanceof BinaryFunctionUnaryFunction<?, ?> |
| 60 | && equals((BinaryFunctionUnaryFunction<?, ?>) obj); | |
| 61 | } | |
| 62 | ||
| 63 | /** | |
| 64 | * Learn whether another BinaryFunctionUnaryFunction is equal to <code>this</code>. | |
| 65 | * @param that BinaryFunctionUnaryFunction to check | |
| 66 | * @return whether equal | |
| 67 | */ | |
| 68 | public boolean equals(BinaryFunctionUnaryFunction<?, ?> that) { | |
| 69 | 12 | return that != null && that.function.equals(this.function); |
| 70 | } | |
| 71 | ||
| 72 | /** | |
| 73 | * {@inheritDoc} | |
| 74 | */ | |
| 75 | @Override | |
| 76 | public int hashCode() { | |
| 77 | 20 | return ("BinaryFunctionUnaryFunction".hashCode() << 2) | function.hashCode(); |
| 78 | } | |
| 79 | ||
| 80 | /** | |
| 81 | * {@inheritDoc} | |
| 82 | */ | |
| 83 | @Override | |
| 84 | public String toString() { | |
| 85 | 16 | return "BinaryFunctionUnaryFunction<" + function + ">"; |
| 86 | } | |
| 87 | ||
| 88 | /** | |
| 89 | * Adapt a BinaryFunction as a UnaryFunction. | |
| 90 | * @param <A> input type | |
| 91 | * @param <T> result type | |
| 92 | * @param function to adapt | |
| 93 | * @return UnaryFunction<A, T> | |
| 94 | */ | |
| 95 | public static <A, T> UnaryFunction<A, T> adapt(BinaryFunction<? super A, ? super A, ? extends T> function) { | |
| 96 | 4 | return null == function ? null : new BinaryFunctionUnaryFunction<A, T>(function); |
| 97 | } | |
| 98 | ||
| 99 | } |