org.h2.index.FunctionCursor 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 org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.result.ResultInterface;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.value.Value;
/**
* A cursor for a function that returns a result.
*/
public class FunctionCursor implements Cursor {
private Session session;
private final ResultInterface result;
private Value[] values;
private Row row;
FunctionCursor(Session session, ResultInterface result) {
this.session = session;
this.result = result;
}
@Override
public Row get() {
if (values == null) {
return null;
}
if (row == null) {
row = session.createRow(values, 1);
}
return row;
}
@Override
public SearchRow getSearchRow() {
return get();
}
@Override
public boolean next() {
row = null;
if (result != null && result.next()) {
values = result.currentRow();
} else {
values = null;
}
return values != null;
}
@Override
public boolean previous() {
throw DbException.throwInternalError(toString());
}
}