1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activespace.query;
19
20 import java.util.List;
21
22 /***
23 * Provides access to some query manager capable of querying objects in some context.
24 *
25 * @version $Revision: 1.1 $
26 */
27 public interface QueryManager {
28
29 /***
30 * Performs a query on a given CacheManager
31 *
32 * @param query the query string using the query notation of the manager's choosing.
33 * @param cacheManager the collection of caches to query on
34 * @return a list of results which may be empty.
35 */
36 public List select(String query, QueryContext cacheManager);
37
38 Object evaluate(String query, QueryContext context) throws QueryException;
39 }