/*

  * 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.functor.core.algorithm;

 import java.io.Serializable;

 import java.util.ListIterator;

 import org.apache.commons.functor.BinaryProcedure;

 import org.apache.commons.functor.UnaryFunction;

 /**

  * Implements an in-place transformation of a ListIterator's contents.

  *

  * @version $Revision: 1156337 $ $Date: 2011-08-10 21:44:54 +0200 (Wed, 10 Aug 2011) $

  */

 public final class InPlaceTransform<T>

     implements BinaryProcedure<ListIterator<T>, UnaryFunction<? super T, ? extends T>>, Serializable {

     /**

      * serialVersionUID declaration.

      */

     private static final long serialVersionUID = 4365206078517376006L;

     private static final InPlaceTransform<Object> INSTANCE = new InPlaceTransform<Object>();

     /**

      * {@inheritDoc}

      * @param left {@link ListIterator}

      * @param right {@link UnaryFunction}

      */

     public void run(ListIterator<T> left, UnaryFunction<? super T, ? extends T> right) {

         while (left.hasNext()) {

             left.set(right.evaluate(left.next()));

         }

     }

     /**

      * {@inheritDoc}

      */

     public boolean equals(Object obj) {

         return obj == this || obj != null && obj.getClass().equals(getClass());

     }

     /**

      * {@inheritDoc}

      */

     public int hashCode() {

         return System.identityHashCode(INSTANCE);

     }

     /**

      * Get an {@link InPlaceTransform} instance.

      * @return InPlaceTransform

      */

     public static InPlaceTransform<Object> instance() {

         return INSTANCE;

     }

 }