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1   /*
2    * Copyright 2002,2004 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  
17  package org.apache.commons.jelly;
18  
19  /***
20   * <p><code>Script</code> represents a Jelly script.
21   * A Script <b>must</b> be thread safe so care should be taken on the
22   * implementations of Scripts. However Tags are only used in a single thread
23   * (each thread will have create its own Tags for the Script it is running)
24   * so multi threading is not a concern for Tag developers.</p>
25   *
26   * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
27   * @version $Revision: 155420 $
28   */
29  public interface Script {
30  
31      /*** Called by the parser to allow a more efficient
32       * representation of the script to be used.
33       */
34      public Script compile() throws JellyException;
35  
36      /*** Evaluates the body of a tag */
37      public void run(JellyContext context, XMLOutput output) throws JellyTagException;
38  
39  }