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Java > Open Source Codes > edu > umd > cs > findbugs > ba > ForwardDataflowAnalysis


1 /*
2  * Bytecode Analysis Framework
3  * Copyright (C) 2003,2004 University of Maryland
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */

19
20 package edu.umd.cs.findbugs.ba;
21
22 /**
23  * Abstract base class for forward dataflow analyses.
24  * Provides convenient implementations for isForwards() and getBlockOrder()
25  * methods.
26  *
27  * @author David Hovemeyer
28  * @see Dataflow
29  * @see DataflowAnalysis
30  */

31 public abstract class ForwardDataflowAnalysis <Fact> extends AbstractDataflowAnalysis<Fact> {
32     private DepthFirstSearch dfs;
33
34     public ForwardDataflowAnalysis(DepthFirstSearch dfs) {
35         if (dfs == null) throw new IllegalArgumentException JavaDoc();
36         this.dfs = dfs;
37     }
38
39     protected DepthFirstSearch getDepthFirstSearch() {
40         return dfs;
41     }
42
43     public boolean isForwards() {
44         return true;
45     }
46
47     public BlockOrder getBlockOrder(CFG cfg) {
48         return new ReversePostOrder(cfg, dfs);
49     }
50 }
51
52 // vim:ts=4
53
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