/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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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* Copyright 2006-2008 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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* Iterator for a set of Entry IDs. It must return values in order of ID.
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*/
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public class IDSetIterator implements Iterator<EntryID>
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{
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/**
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* An array of ID values in order of ID.
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*/
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private long[] entryIDList;
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/**
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* Current position of the iterator as an index into the array of IDs.
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*/
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private int i;
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/**
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* Create a new iterator for a given array of entry IDs.
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* @param entryIDList An array of IDs in order or ID.
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*/
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public IDSetIterator(long[] entryIDList)
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{
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this.entryIDList = entryIDList;
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}
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/**
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* Create a new iterator for a given array of entry IDs.
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* @param entryIDList An array of IDs in order or ID.
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* @param begin The entry ID of the first entry that should be returned, or
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* {@code null} if it should start at the beginning of the list.
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*/
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public IDSetIterator(long[] entryIDList, EntryID begin)
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{
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this.entryIDList = entryIDList;
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if (begin == null)
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{
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i = 0;
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}
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else
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{
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for (i=0; i < entryIDList.length; i++)
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{
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if (entryIDList[i] == begin.longValue())
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{
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break;
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}
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}
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if (i >= entryIDList.length)
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{
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i = 0;
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}
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}
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}
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/**
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* Returns <tt>true</tt> if the iteration has more elements. (In other
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* words, returns <tt>true</tt> if <tt>next</tt> would return an element
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* rather than 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 i < entryIDList.length;
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}
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/**
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* Returns the next element in the iteration. Calling this method
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* repeatedly until the {@link #hasNext()} method returns false will
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* return each element 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()
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throws NoSuchElementException
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{
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if (i < entryIDList.length)
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{
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return new EntryID(entryIDList[i++]);
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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
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* the underlying collection is modified while the iteration is in
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* progress in any way other than by calling this method.
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*
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* @exception UnsupportedOperationException if the <tt>remove</tt>
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* operation is 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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