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Java > Open Source Codes > org > apache > avalon > excalibur > pipeline > Pipeline


1 /*
2  * Copyright (C) The Apache Software Foundation. All rights reserved.
3  *
4  * This software is published under the terms of the Apache Software License
5  * version 1.1, a copy of which has been included with this distribution in
6  * the LICENSE.txt file.
7  */
8 package org.apache.avalon.excalibur.pipeline;
9
10 import java.util.NoSuchElementException JavaDoc;
11
12 /**
13  * This represents a pipeline made up of stages.
14  *
15  * @author <a HREF="mailto:peter@apache.org">Peter Donald</a>
16  */
17 public interface Pipeline
18     extends Stage
19 {
20     /**
21      * Retrieve size of pipeline (number of stages).
22      *
23      * @return the size of pipeline
24      */
25     int getSize();
26
27     /**
28      * Retrieve a particular stage of pipeline
29      *
30      * @param index the index of stage
31      * @return the stage
32      * @exception NoSuchElementException if index >= getSize() or index < 0
33      */
34     Stage getStage( int index )
35         throws NoSuchElementException JavaDoc;
36 }
37
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