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package eu.dnetlib.msro.openaireplus.workflows.nodes.datacite;
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import java.util.Iterator;
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import java.util.concurrent.BlockingQueue;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* The Class IteratorOnQueue.
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*
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* @param <T> the generic type
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*/
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public class IteratorOnQueue<T> implements Iterator<T> {
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/**
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* The Constant log.
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*/
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private static final Log log = LogFactory.getLog(IteratorOnQueue.class);
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/**
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* The input queue.
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*/
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private final BlockingQueue<T> inputQueue;
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/**
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* The current item.
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*/
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private T currentItem;
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/**
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* The end queue.
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*/
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private T endQueue;
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/**
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* Instantiates a new iterator on queue.
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*
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* @param inputQueue the input queue
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* @param endQueue the end queue
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*/
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public IteratorOnQueue(final BlockingQueue<T> inputQueue, final T endQueue) {
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this.inputQueue = inputQueue;
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this.endQueue = endQueue;
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try {
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currentItem = this.inputQueue.take();
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} catch (InterruptedException e) {
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log.error(e);
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}
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}
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/**
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* Checks for next.
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*
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* @return true, if successful
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*/
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@Override
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public boolean hasNext() {
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return currentItem != this.endQueue;
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}
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/**
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* Next.
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*
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* @return the t
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*/
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@Override
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public T next() {
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T previous = currentItem;
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try {
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currentItem = this.inputQueue.take();
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} catch (Exception e) {
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log.error(e);
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}
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return previous;
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}
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/**
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* Removes the.
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*/
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@Override
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public void remove() {
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// TODO Auto-generated method stub
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}
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}
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