01: /**********************************************************************
02: Copyright (c) 2007 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.query;
18:
19: import org.jpox.store.expression.QueryExpression;
20:
21: /**
22: * Interface representing an evaluator of a QueryExpression.
23: */
24: public interface Evaluator {
25: /**
26: * Method to evaluate the query.
27: * @param queryStmt The query statement
28: * @return The result
29: */
30: public abstract Object evaluate(QueryExpression queryStmt);
31: }
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