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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-M1

/*
 * 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.
 */
/**
 * This package contains implementations of the
 * {@link org.apache.commons.collections4.Closure Closure},
 * {@link org.apache.commons.collections4.Predicate Predicate},
 * {@link org.apache.commons.collections4.Transformer Transformer} and
 * {@link org.apache.commons.collections4.Factory Factory} interfaces.
 * These provide simple callbacks for processing with collections.
 * 
 * WARNING: from v4.1 onwards several unsafe classes in this package
 * will not be serializable anymore in order to prevent potential remote
 * code execution exploits.
 * 

 * Classes considered to be unsafe are:
 * 

 * CloneTransformer
 * ForClosure
 * InstantiateFactory
 * InstantiateTransformer
 * InvokerTransformer
 * PrototypeFactory$PrototypeCloneFactory
 * PrototypeFactory$PrototypeSerializationFactory
 * WhileClosure
 * 
 *
 */
package org.apache.commons.collections4.functors;