| /* |
| * 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.collections4.functors; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.collections4.FunctorException; |
| import org.apache.commons.collections4.Predicate; |
| |
| /** |
| * Predicate implementation that throws an exception if the input is null. |
| * |
| * @since 3.0 |
| * @version $Id$ |
| */ |
| public final class NullIsExceptionPredicate<T> implements PredicateDecorator<T>, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = 3243449850504576071L; |
| |
| /** The predicate to decorate */ |
| private final Predicate<? super T> iPredicate; |
| |
| /** |
| * Factory to create the null exception predicate. |
| * |
| * @param <T> the type that the predicate queries |
| * @param predicate the predicate to decorate, not null |
| * @return the predicate |
| * @throws NullPointerException if the predicate is null |
| */ |
| public static <T> Predicate<T> nullIsExceptionPredicate(final Predicate<? super T> predicate) { |
| if (predicate == null) { |
| throw new NullPointerException("Predicate must not be null"); |
| } |
| return new NullIsExceptionPredicate<T>(predicate); |
| } |
| |
| /** |
| * Constructor that performs no validation. |
| * Use <code>nullIsExceptionPredicate</code> if you want that. |
| * |
| * @param predicate the predicate to call after the null check |
| */ |
| public NullIsExceptionPredicate(final Predicate<? super T> predicate) { |
| super(); |
| iPredicate = predicate; |
| } |
| |
| /** |
| * Evaluates the predicate returning the result of the decorated predicate |
| * once a null check is performed. |
| * |
| * @param object the input object |
| * @return true if decorated predicate returns true |
| * @throws FunctorException if input is null |
| */ |
| @Override |
| public boolean evaluate(final T object) { |
| if (object == null) { |
| throw new FunctorException("Input Object must not be null"); |
| } |
| return iPredicate.evaluate(object); |
| } |
| |
| /** |
| * Gets the predicate being decorated. |
| * |
| * @return the predicate as the only element in an array |
| * @since 3.1 |
| */ |
| @Override |
| @SuppressWarnings("unchecked") |
| public Predicate<? super T>[] getPredicates() { |
| return new Predicate[] { iPredicate }; |
| } |
| |
| } |