01: /*
02: * Copyright 2006, 2007 Odysseus Software GmbH
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 de.odysseus.el.tree;
17:
18: /**
19: * Tree cache interface.
20: * A tree cache holds expression trees by expression strings. A tree cache implementation
21: * must be thread-safe.
22: *
23: * @author Christoph Beck
24: */
25: public interface TreeCache {
26: /**
27: * Lookup tree
28: */
29: public Tree get(String expression);
30:
31: /**
32: * Cache tree
33: */
34: public void put(String expression, Tree tree);
35: }
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