/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.qp.operator;
public final class CursorLifecycle
{
public static void checkIdle(CursorBase cursor)
{
if (!cursor.isIdle()) {
throw new WrongStateException(CursorState.IDLE.toString(), cursor);
}
}
public static void checkIdleOrActive(CursorBase cursor)
{
if (cursor.isClosed()) {
String state = CursorState.IDLE.toString() + " OR " + CursorState.ACTIVE.toString();
throw new WrongStateException(state, cursor);
}
}
public static void checkClosed (CursorBase cursor)
{
if (!cursor.isClosed()) {
throw new WrongStateException (CursorState.CLOSED.toString(), cursor);
}
}
private static String cursorState(CursorBase cursor)
{
return cursor.isIdle() ? CursorState.IDLE.toString() :
cursor.isActive() ? CursorState.ACTIVE.toString() : CursorState.CLOSED.toString();
}
public enum CursorState {
CLOSED,
IDLE,
ACTIVE
}
public static class WrongStateException extends RuntimeException
{
WrongStateException(String expectedState, CursorBase cursor)
{
super(String.format("Cursor should be %s but is actually %s", expectedState, cursorState(cursor)));
}
}
}