/*
* Copyright 2004-2013 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.lealone.dbobject.index;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.lealone.dbobject.table.Column;
import org.lealone.dbobject.table.TableLink;
import org.lealone.engine.Session;
import org.lealone.message.DbException;
import org.lealone.result.Row;
import org.lealone.result.SearchRow;
import org.lealone.value.DataType;
import org.lealone.value.Value;
/**
* The cursor implementation for the linked index.
*/
public class LinkedCursor implements Cursor {
private final TableLink tableLink;
private final PreparedStatement prep;
private final String sql;
private final Session session;
private final ResultSet rs;
private Row current;
LinkedCursor(TableLink tableLink, ResultSet rs, Session session, String sql, PreparedStatement prep) {
this.session = session;
this.tableLink = tableLink;
this.rs = rs;
this.sql = sql;
this.prep = prep;
}
public Row get() {
return current;
}
public SearchRow getSearchRow() {
return current;
}
public boolean next() {
try {
boolean result = rs.next();
if (!result) {
rs.close();
tableLink.reusePreparedStatement(prep, sql);
current = null;
return false;
}
} catch (SQLException e) {
throw DbException.convert(e);
}
current = tableLink.getTemplateRow();
for (int i = 0; i < current.getColumnCount(); i++) {
Column col = tableLink.getColumn(i);
Value v = DataType.readValue(session, rs, i + 1, col.getType());
current.setValue(i, v);
}
return true;
}
public boolean previous() {
throw DbException.throwInternalError();
}
}