| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.adapter; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.functor.BinaryPredicate; |
| import org.apache.commons.functor.Predicate; |
| import org.apache.commons.lang3.Validate; |
| |
| /** |
| * Adapts a |
| * {@link Predicate Predicate} |
| * to the |
| * {@link BinaryPredicate BinaryPredicate} interface |
| * by ignoring the first binary argument. |
| * <p/> |
| * Note that although this class implements |
| * {@link Serializable}, a given instance will |
| * only be truly <code>Serializable</code> if the |
| * underlying functor is. Attempts to serialize |
| * an instance whose delegate is not |
| * <code>Serializable</code> will result in an exception. |
| * |
| * @param <L> the left argument type. |
| * @param <R> the right argument type. |
| * @version $Revision$ $Date$ |
| */ |
| public final class IgnoreLeftPredicate<L, R> implements BinaryPredicate<L, R>, Serializable { |
| /** |
| * serialVersionUID declaration. |
| */ |
| private static final long serialVersionUID = -3200352647509255939L; |
| /** The {@link Predicate Predicate} I'm wrapping. */ |
| private final Predicate<? super R> predicate; |
| |
| /** |
| * Create a new IgnoreLeftPredicate. |
| * @param predicate the right predicate |
| */ |
| public IgnoreLeftPredicate(Predicate<? super R> predicate) { |
| this.predicate = Validate.notNull(predicate, "Predicate argument was null"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean test(L left, R right) { |
| return predicate.test(right); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean equals(Object that) { |
| return that == this || (that instanceof IgnoreLeftPredicate<?, ?> && equals((IgnoreLeftPredicate<?, ?>) that)); |
| } |
| |
| /** |
| * Learn whether another IgnoreLeftPredicate is equal to this. |
| * @param that the IgnoreLeftPredicate to test |
| * @return boolean |
| */ |
| public boolean equals(IgnoreLeftPredicate<?, ?> that) { |
| return null != that && predicate.equals(that.predicate); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public int hashCode() { |
| int hash = "IgnoreLeftPredicate".hashCode(); |
| hash ^= predicate.hashCode(); |
| return hash; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String toString() { |
| return "IgnoreLeftPredicate<" + predicate + ">"; |
| } |
| |
| /** |
| * Adapt a Predicate to an IgnoreLeftPredicate. |
| * @param <L> left type |
| * @param <R> right type |
| * @param predicate to adapt |
| * @return IgnoreLeftPredicate<L, R> |
| */ |
| public static <L, R> IgnoreLeftPredicate<L, R> adapt(Predicate<? super R> predicate) { |
| return null == predicate ? null : new IgnoreLeftPredicate<L, R>(predicate); |
| } |
| |
| } |