| /* |
| * Copyright 2003,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.functor.core.composite; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.functor.BinaryPredicate; |
| import org.apache.commons.functor.UnaryFunction; |
| |
| /** |
| * A {@link BinaryPredicate BinaryPredicate} composed of |
| * one binary predicate, <i>p</i>, and two unary |
| * functions, <i>f</i> and <i>g</i>, |
| * evaluating the ordered parameters <i>x</i>, <i>y</i> |
| * to <code><i>p</i>(<i>f</i>(<i>x</i>),<i>g</i>(<i>y</i>))</code>. |
| * <p> |
| * Note that although this class implements |
| * {@link Serializable}, a given instance will |
| * only be truly <code>Serializable</code> if all the |
| * underlying functors are. Attempts to serialize |
| * an instance whose delegates are not all |
| * <code>Serializable</code> will result in an exception. |
| * </p> |
| * @version $Revision$ $Date$ |
| * @author Rodney Waldhoff |
| */ |
| public class UnaryCompositeBinaryPredicate implements BinaryPredicate, Serializable { |
| |
| // constructor |
| // ------------------------------------------------------------------------ |
| public UnaryCompositeBinaryPredicate(BinaryPredicate f, UnaryFunction g, UnaryFunction h) { |
| binary = f; |
| leftUnary = g; |
| rightUnary = h; |
| } |
| |
| // function interface |
| // ------------------------------------------------------------------------ |
| public boolean test(Object left, Object right) { |
| return binary.test(leftUnary.evaluate(left), rightUnary.evaluate(right)); |
| } |
| |
| public boolean equals(Object that) { |
| if(that instanceof UnaryCompositeBinaryPredicate) { |
| return equals((UnaryCompositeBinaryPredicate)that); |
| } else { |
| return false; |
| } |
| } |
| |
| public boolean equals(UnaryCompositeBinaryPredicate that) { |
| return (null != that) && |
| (null == binary ? null == that.binary : binary.equals(that.binary)) && |
| (null == leftUnary ? null == that.leftUnary : leftUnary.equals(that.leftUnary)) && |
| (null == rightUnary ? null == that.rightUnary : rightUnary.equals(that.rightUnary)); |
| } |
| |
| public int hashCode() { |
| int hash = "UnaryCompositeBinaryPredicate".hashCode(); |
| if(null != binary) { |
| hash <<= 4; |
| hash ^= binary.hashCode(); |
| } |
| if(null != leftUnary) { |
| hash <<= 4; |
| hash ^= leftUnary.hashCode(); |
| } |
| if(null != rightUnary) { |
| hash <<= 4; |
| hash ^= rightUnary.hashCode(); |
| } |
| return hash; |
| } |
| |
| public String toString() { |
| return "UnaryCompositeBinaryPredicate<" + binary + ";" + leftUnary + ";" + rightUnary + ">"; |
| } |
| |
| // attributes |
| // ------------------------------------------------------------------------ |
| private BinaryPredicate binary = null; |
| private UnaryFunction leftUnary = null; |
| private UnaryFunction rightUnary = null; |
| |
| } |