| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| LeftIdentity |
|
| 1.0;1 |
| 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.core; | |
| 18 | ||
| 19 | import org.apache.commons.functor.BinaryFunction; | |
| 20 | import org.apache.commons.functor.BinaryPredicate; | |
| 21 | import org.apache.commons.functor.adapter.BinaryFunctionBinaryPredicate; | |
| 22 | import org.apache.commons.functor.adapter.IgnoreRightFunction; | |
| 23 | ||
| 24 | /** | |
| 25 | * Holder class for a left-identity <code>BinaryFunction</code> (evaluates to the left argument) and a left-identity | |
| 26 | * <code>BinaryPredicate</code> (tests whether left <code>Boolean</code> argument equals <code>Boolean.TRUE</code>). | |
| 27 | * | |
| 28 | * @version $Revision: 1160411 $ $Date: 2011-08-22 22:09:01 +0200 (Mon, 22 Aug 2011) $ | |
| 29 | * @author Rodney Waldhoff | |
| 30 | * @author Matt Benson | |
| 31 | */ | |
| 32 | public final class LeftIdentity { | |
| 33 | ||
| 34 | // static attributes | |
| 35 | // ------------------------------------------------------------------------ | |
| 36 | /** | |
| 37 | * Left-identity function. | |
| 38 | */ | |
| 39 | 2 | public static final BinaryFunction<Object, Object, Object> FUNCTION = LeftIdentity.<Object, Object>function(); |
| 40 | ||
| 41 | /** | |
| 42 | * Left-identity predicate. | |
| 43 | */ | |
| 44 | 2 | public static final BinaryPredicate<Boolean, Object> PREDICATE = LeftIdentity.<Object>predicate(); |
| 45 | ||
| 46 | // constructor | |
| 47 | // ------------------------------------------------------------------------ | |
| 48 | /** | |
| 49 | * Create a new LeftIdentity (for clients that require an object). | |
| 50 | */ | |
| 51 | 0 | public LeftIdentity() { |
| 52 | 0 | } |
| 53 | ||
| 54 | // static methods | |
| 55 | // ------------------------------------------------------------------------ | |
| 56 | ||
| 57 | /** | |
| 58 | * Get a Left-identity BinaryFunction. | |
| 59 | * @param <L> the left argument type. | |
| 60 | * @param <R> the right argument type. | |
| 61 | * @return BinaryFunction<L, R, L> | |
| 62 | */ | |
| 63 | public static <L, R> BinaryFunction<L, R, L> function() { | |
| 64 | 28 | return IgnoreRightFunction.adapt(new Identity<L>()); |
| 65 | } | |
| 66 | ||
| 67 | /** | |
| 68 | * Get a left-identity BinaryPredicate. | |
| 69 | * @param <R> the right argument type. | |
| 70 | * @return BinaryPredicate<Boolean, R> | |
| 71 | */ | |
| 72 | public static <R> BinaryPredicate<Boolean, R> predicate() { | |
| 73 | 2 | return BinaryFunctionBinaryPredicate.adapt(IgnoreRightFunction |
| 74 | .<Boolean, R, Boolean> adapt(new Identity<Boolean>())); | |
| 75 | } | |
| 76 | } |