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Commons Collections example source code file (IdentityPredicate.java)

This example Commons Collections source code file (IdentityPredicate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

identitypredicate, identitypredicate, io, object, object, predicate, predicate, serializable, serializable

The Commons Collections IdentityPredicate.java source code

 *  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.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: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * @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 if you want that.
     * @param object  the object to compare to
    public IdentityPredicate(Object object) {
        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;


Other Commons Collections examples (source code examples)

Here is a short list of links related to this Commons Collections IdentityPredicate.java source code file:

my book on functional programming


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