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Java > Open Source Codes > edu > umd > cs > findbugs > ba > bcp > New


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.bcp;
21
22 import org.apache.bcel.generic.ConstantPoolGen;
23 import org.apache.bcel.generic.Instruction;
24 import org.apache.bcel.generic.InstructionHandle;
25 import org.apache.bcel.generic.NEW;
26
27 import edu.umd.cs.findbugs.ba.DataflowAnalysisException;
28 import edu.umd.cs.findbugs.ba.vna.ValueNumberFrame;
29
30 /**
31  * A PatternElement which matches NEW instructions and binds the
32  * result to a variable.
33  *
34  * @author David Hovemeyer
35  * @see PatternElement
36  */

37 public class New extends OneVariableInstruction {
38     /**
39      * Constructor.
40      *
41      * @param resultVarName name of the result of the NEW instruction
42      */

43     public New(String JavaDoc resultVarName) {
44         super(resultVarName);
45     }
46
47     @Override JavaDoc
48          public MatchResult match(InstructionHandle handle, ConstantPoolGen cpg,
49                              ValueNumberFrame before, ValueNumberFrame after, BindingSet bindingSet) throws DataflowAnalysisException {
50
51         Instruction ins = handle.getInstruction();
52         if (!(ins instanceof NEW))
53             return null;
54
55         LocalVariable result = new LocalVariable(after.getTopValue());
56         return addOrCheckDefinition(result, bindingSet);
57     }
58 }
59
60 // vim:ts=4
61
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