/*
* Copyright 2004-2011 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.h2.index;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.value.DataType;
import org.h2.value.Value;
/**
* A cursor for a function that returns a JDBC result set.
*/
public class FunctionCursorResultSet implements Cursor {
private final Session session;
private final ResultSet result;
private final ResultSetMetaData meta;
private Value[] values;
private Row row;
FunctionCursorResultSet(Session session, ResultSet result) {
this.session = session;
this.result = result;
try {
this.meta = result.getMetaData();
} catch (SQLException e) {
throw DbException.convert(e);
}
}
public Row get() {
if (values == null) {
return null;
}
if (row == null) {
row = new Row(values, 1);
}
return row;
}
public SearchRow getSearchRow() {
return get();
}
public boolean next() {
row = null;
try {
if (result != null && result.next()) {
int columnCount = meta.getColumnCount();
values = new Value[columnCount];
for (int i = 0; i < columnCount; i++) {
int type = DataType.convertSQLTypeToValueType(meta.getColumnType(i + 1));
values[i] = DataType.readValue(session, result, i+1, type);
}
} else {
values = null;
}
} catch (SQLException e) {
throw DbException.convert(e);
}
return values != null;
}
public boolean previous() {
throw DbException.throwInternalError();
}
}