01: /**********************************************************************
02: Copyright (c) 2005 Erik Bengtson and others. All rights reserved.
03: Licensed under the Apache License, Version 2.0 (the "License");
04: you may not use this file except in compliance with the License.
05: You may obtain a copy of the License at
06:
07: http://www.apache.org/licenses/LICENSE-2.0
08:
09: Unless required by applicable law or agreed to in writing, software
10: distributed under the License is distributed on an "AS IS" BASIS,
11: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: See the License for the specific language governing permissions and
13: limitations under the License.
14:
15: Contributors:
16: ...
17: **********************************************************************/package org.jpox.store.expression;
18:
19: /**
20: * Interface that allows performing algebra operations over sets
21: * @version $Revision: 1.1 $
22: */
23: public interface ExpressionLogicSetAdapter {
24: /**
25: * Generates a expression that represents the cartesian product of two sets: <code>X</code> and <code>Y</code>.
26: * Actually, <code>X</code> is not generated to the expression.
27: * @param Y right hand set
28: * @return the cartesion product expression. if the cartesian product expression is "X x Y", the returned expression
29: * is " x Y". Note that the left hand set was not introduced to the expression
30: **/
31: String cartersianProduct(LogicSetExpression Y);
32: }
|