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Java > Open Source Codes > org > apache > cocoon > components > variables > VariableResolverFactory


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
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.apache.cocoon.components.variables;
17
18 import org.apache.cocoon.sitemap.PatternException;
19
20 /**
21  * This factory component creates a {@link VariableResolver} for an expression.
22  * A {@link VariableResolver} can then be used at runtime to resolve
23  * a variable with the current value.
24  * A variable can contain dynamic parts that are contained in {...},
25  *
26  * NOTE: This interface is work in progress, so chances are that it will
27  * change.
28  *
29  * @author <a HREF="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
30  *
31  * @version CVS $Id: VariableResolverFactory.java 30932 2004-07-29 17:35:38Z vgritsenko $
32  */
33 public interface VariableResolverFactory {
34     
35     String JavaDoc ROLE = VariableResolverFactory.class.getName();
36     
37     /**
38      * Get a resolver for a given expression. Chooses the most efficient implementation
39      * depending on <code>expression</code>.
40      * Don't forget to release the resolver
41      */
42     VariableResolver lookup(String JavaDoc expression)
43     throws PatternException;
44
45     void release(VariableResolver resolver);
46 }
47
48
49
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