| /* |
| * 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.Predicate; |
| |
| /** |
| * Predicate implementation that returns true if the input is an instanceof |
| * the type stored in this predicate. |
| * |
| * @since 3.0 |
| * @version $Id$ |
| */ |
| public final class InstanceofPredicate implements Predicate<Object>, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = -6682656911025165584L; |
| |
| /** The type to compare to */ |
| private final Class<?> iType; |
| |
| /** |
| * Factory to create the identity predicate. |
| * |
| * @param type the type to check for, may not be null |
| * @return the predicate |
| * @throws NullPointerException if the class is null |
| */ |
| public static Predicate<Object> instanceOfPredicate(final Class<?> type) { |
| if (type == null) { |
| throw new NullPointerException("The type to check instanceof must not be null"); |
| } |
| return new InstanceofPredicate(type); |
| } |
| |
| /** |
| * Constructor that performs no validation. |
| * Use <code>instanceOfPredicate</code> if you want that. |
| * |
| * @param type the type to check for |
| */ |
| public InstanceofPredicate(final Class<?> type) { |
| super(); |
| iType = type; |
| } |
| |
| /** |
| * Evaluates the predicate returning true if the input object is of the correct type. |
| * |
| * @param object the input object |
| * @return true if input is of stored type |
| */ |
| @Override |
| public boolean evaluate(final Object object) { |
| return iType.isInstance(object); |
| } |
| |
| /** |
| * Gets the type to compare to. |
| * |
| * @return the type |
| * @since 3.1 |
| */ |
| public Class<?> getType() { |
| return iType; |
| } |
| |
| } |