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Java > Open Source Codes > org > outerj > daisy > repository > query > PredicateExpression


1 /*
2  * Copyright 2004 Outerthought bvba and Schaubroeck nv
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.outerj.daisy.repository.query;
17
18 import org.outerj.daisy.repository.Document;
19 import org.outerj.daisy.repository.Version;
20
21 /**
22  * An expression that evaluates to true or false, as used in the where
23  * clause of a Daisy query.
24  */
25 public interface PredicateExpression {
26     /**
27      * The version argument is optional, if not present (null) version-dependent information
28      * will be taken from the document object.
29      */
30     boolean evaluate(Document document, Version version) throws QueryException;
31 }
32
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