/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying * information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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/**
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* Implements an iterator over a range of entry IDs.
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*/
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public class IndexIteratorRange implements Iterator<EntryID>
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{
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/**
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* The upper bound of the range.
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*/
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private long highID;
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/**
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* The current position of the iterator in the range.
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*/
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private long currentID;
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/**
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* Constructs a range iterator from lower and upper bounds.
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*
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* @param lowID The lower bound.
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* @param highID The upper bound.
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*/
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public IndexIteratorRange(long lowID, long highID)
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{
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this.currentID = lowID;
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this.highID = highID;
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}
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/**
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* Returns <tt>true</tt> if the iteration has more elements. (In other words,
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* returns <tt>true</tt> if <tt>next</tt> would return an element rather than
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* throwing an exception.)
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*
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* @return <tt>true</tt> if the iterator has more elements.
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*/
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public boolean hasNext()
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{
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return currentID <= highID;
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}
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/**
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* Returns the next element in the iteration. Calling this method repeatedly
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* until the {@link #hasNext()} method returns false will return each element
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* in the underlying collection exactly once.
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*
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* @return the next element in the iteration.
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* @throws java.util.NoSuchElementException
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* iteration has no more elements.
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*/
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public EntryID next() throws NoSuchElementException
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{
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if (currentID <= highID)
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{
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return new EntryID(currentID++);
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}
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else
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{
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throw new NoSuchElementException();
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}
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}
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/**
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* Removes from the underlying collection the last element returned by the
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* iterator (optional operation). This method can be called only once per
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* call to <tt>next</tt>. The behavior of an iterator is unspecified if the
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* underlying collection is modified while the iteration is in progress in any
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* way other than by calling this method.
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*
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* @throws UnsupportedOperationException if the <tt>remove</tt> operation is
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* not supported by this Iterator.
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*/
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public void remove() throws UnsupportedOperationException
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{
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throw new UnsupportedOperationException();
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}
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}
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