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 * 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
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 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.commons.collections4.functors;

import org.apache.commons.collections4.Transformer;

Transformer implementation that returns a clone of the input object.

Clone is performed using PrototypeFactory.prototypeFactory(input).create().

WARNING: from v4.1 onwards this class will not be serializable anymore in order to prevent potential remote code execution exploits. Please refer to COLLECTIONS-580 for more details.

Since:3.0
/** * Transformer implementation that returns a clone of the input object. * <p> * Clone is performed using <code>PrototypeFactory.prototypeFactory(input).create()</code>. * <p> * <b>WARNING:</b> from v4.1 onwards this class will <b>not</b> be serializable anymore * in order to prevent potential remote code execution exploits. Please refer to * <a href="https://issues.apache.org/jira/browse/COLLECTIONS-580">COLLECTIONS-580</a> * for more details. * * @since 3.0 */
public class CloneTransformer<T> implements Transformer<T, T> {
Singleton predicate instance
/** Singleton predicate instance */
@SuppressWarnings("rawtypes") // the singleton instance works for all types public static final Transformer INSTANCE = new CloneTransformer<>();
Factory returning the singleton instance.
Type parameters:
  • <T> – the type of the objects to be cloned
Returns:the singleton instance
Since:3.1
/** * Factory returning the singleton instance. * * @param <T> the type of the objects to be cloned * @return the singleton instance * @since 3.1 */
@SuppressWarnings("unchecked") // the singleton instance works for all types public static <T> Transformer<T, T> cloneTransformer() { return INSTANCE; }
Constructor.
/** * Constructor. */
private CloneTransformer() { super(); }
Transforms the input to result by cloning it.
Params:
  • input – the input object to transform
Returns:the transformed result
/** * Transforms the input to result by cloning it. * * @param input the input object to transform * @return the transformed result */
@Override public T transform(final T input) { if (input == null) { return null; } return PrototypeFactory.prototypeFactory(input).create(); } }