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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

There is a newer version: 4.5.0-M2

/*
 * 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.Closure;

/**
 * Closure implementation that does nothing.
 *
 * @since 3.0
 * @version $Id: NOPClosure.java 1543950 2013-11-20 21:13:35Z tn $
 */
public final class NOPClosure implements Closure, Serializable {

    /** Serial version UID */
    private static final long serialVersionUID = 3518477308466486130L;

    /** Singleton predicate instance */
    @SuppressWarnings("rawtypes")
    public static final Closure INSTANCE = new NOPClosure