/*
* Terrier - Terabyte Retriever
* Webpage: http://terrier.org
* Contact: terrier{a.}dcs.gla.ac.uk
* University of Glasgow - School of Computing Science
* http://www.gla.ac.uk/
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is ArrayOfIdsIterablePosting.java.
*
* The Original Code is Copyright (C) 2004-2011 the University of Glasgow.
* All Rights Reserved.
*
* Contributor(s):
* Craig Macdonald <craigm{a.}dcs.gla.ac.uk> (original author)
*
*/
package org.terrier.structures.postings;
import java.io.IOException;
import org.terrier.structures.postings.BasicPostingImpl;
import org.terrier.structures.postings.IterablePostingImpl;
import org.terrier.structures.postings.WritablePosting;
/** An instance of IterablePostings that works with a passed array of ids
* @author Craig Macdonald */
public class ArrayOfIdsIterablePosting extends IterablePostingImpl {
/** ids of each of the entries in this posting list */
protected int[] ids;
/** where we are in the current posting list */
protected int indice = -1;
/** Make a new IterablePosting using these ids */
public ArrayOfIdsIterablePosting(int[] _ids)
{
ids = _ids;
}
/** {@inheritDoc} */
public int next() throws IOException {
if (indice == ids.length -1)
return EOL;
return ids[++indice];
}
/** {@inheritDoc} */
public boolean endOfPostings() {
return (indice == ids.length -1);
}
/** {@inheritDoc} */
public WritablePosting asWritablePosting() {
return new BasicPostingImpl(ids[indice], 0);
}
/** {@inheritDoc} */
public int getId()
{
return ids[indice];
}
/** {@inheritDoc} Returns 0. */
public int getDocumentLength() {return 0;}
/**
* {@inheritDoc}
*/
public int getFrequency() {return 0;}
/**
* {@inheritDoc}
*/
public void setId(int id) {}
/**
* {@inheritDoc}
*/
public void close() throws IOException {}
}