org.h2.index.NonUniqueHashCursor Maven / Gradle / Ivy
/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.index;
import java.util.ArrayList;
import org.h2.engine.Session;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.table.RegularTable;
/**
* Cursor implementation for non-unique hash index
*
* @author Sergi Vladykin
*/
public class NonUniqueHashCursor implements Cursor {
private final Session session;
private final ArrayList positions;
private final RegularTable tableData;
private int index = -1;
public NonUniqueHashCursor(Session session, RegularTable tableData,
ArrayList positions) {
this.session = session;
this.tableData = tableData;
this.positions = positions;
}
@Override
public Row get() {
if (index < 0 || index >= positions.size()) {
return null;
}
return tableData.getRow(session, positions.get(index));
}
@Override
public SearchRow getSearchRow() {
return get();
}
@Override
public boolean next() {
return positions != null && ++index < positions.size();
}
@Override
public boolean previous() {
return positions != null && --index >= 0;
}
}