| /* |
| * Copyright 2001-2004 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.collections.functors; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.collections.Predicate; |
| |
| /** |
| * Predicate implementation that returns true if the input is the same object |
| * as the one stored in this predicate. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:33 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class IdentityPredicate implements Predicate, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = -89901658494523293L; |
| |
| |
| /** The value to compare to */ |
| private final Object iValue; |
| |
| /** |
| * Factory to create the identity predicate. |
| * |
| * @param object the object to compare to |
| * @return the predicate |
| * @throws IllegalArgumentException if the predicate is null |
| */ |
| public static Predicate getInstance(Object object) { |
| if (object == null) { |
| return NullPredicate.INSTANCE; |
| } |
| return new IdentityPredicate(object); |
| } |
| |
| /** |
| * Constructor that performs no validation. |
| * Use <code>getInstance</code> if you want that. |
| * |
| * @param object the object to compare to |
| */ |
| public IdentityPredicate(Object object) { |
| super(); |
| iValue = object; |
| } |
| |
| /** |
| * Evaluates the predicate returning true if the input object is identical to |
| * the stored object. |
| * |
| * @param object the input object |
| * @return true if input is the same object as the stored value |
| */ |
| public boolean evaluate(Object object) { |
| return (iValue == object); |
| } |
| |
| /** |
| * Gets the value. |
| * |
| * @return the value |
| * @since Commons Collections 3.1 |
| */ |
| public Object getValue() { |
| return iValue; |
| } |
| |
| } |