/*

  * 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.giraph.io.iterables;

 import java.util.Iterator;

 /**

  * Wraps {@link Iterator} into object which provides iteration like in

  * {@link org.apache.giraph.io.VertexReader} or

  * {@link org.apache.giraph.io.EdgeReader}

  *

  * @param <T>

  */

 public class IteratorToReaderWrapper<T> {

   /** Wrapped iterator */

   private Iterator<T> iterator;

   /** Current object */

   private T currentObject = null;

   /**

    * Constructor

    *

    * @param iterator Iterator to wrap

    */

   public IteratorToReaderWrapper(Iterator<T> iterator) {

     this.iterator = iterator;

   }

   /**

    * Read next object

    *

    * @return False iff there are no more objects

    */

   public boolean nextObject() {

     boolean hasNext = iterator.hasNext();

     if (hasNext) {

       currentObject = iterator.next();

     } else {

       currentObject = null;

     }

     return hasNext;

   }

   /**

    * Get the current object

    *

    * @return Current object

    */

   public T getCurrentObject() {

     return currentObject;

   }

 }