01: /*
02: * Spoon - http://spoon.gforge.inria.fr/
03: * Copyright (C) 2006 INRIA Futurs <renaud.pawlak@inria.fr>
04: *
05: * This software is governed by the CeCILL-C License under French law and
06: * abiding by the rules of distribution of free software. You can use, modify
07: * and/or redistribute the software under the terms of the CeCILL-C license as
08: * circulated by CEA, CNRS and INRIA at http://www.cecill.info.
09: *
10: * This program is distributed in the hope that it will be useful, but WITHOUT
11: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12: * FITNESS FOR A PARTICULAR PURPOSE. See the CeCILL-C License for more details.
13: *
14: * The fact that you are presently reading this means that you have had
15: * knowledge of the CeCILL-C license and that you accept its terms.
16: */
17:
18: package spoon.reflect.visitor;
19:
20: import java.util.Stack;
21:
22: import spoon.reflect.declaration.CtElement;
23: import spoon.reflect.reference.CtReference;
24:
25: /**
26: * This class defines a scanner that maintains a scanning stack for contextual
27: * awareness.
28: */
29: public class CtStackScanner extends CtScanner {
30:
31: /**
32: * Default constructor.
33: */
34: public CtStackScanner() {
35: }
36:
37: /**
38: * The stack of elements.
39: */
40: protected Stack<CtElement> elementStack = new Stack<CtElement>();
41:
42: /**
43: * The stack of element references.
44: */
45: protected Stack<CtReference> referenceStack = new Stack<CtReference>();
46:
47: /**
48: * Pops the element.
49: */
50: protected void exit(CtElement e) {
51: CtElement ret = elementStack.pop();
52: if (ret != e)
53: throw new RuntimeException("Unconsitant Stack");
54: super .exit(e);
55: }
56:
57: /**
58: * Pops the element reference.
59: */
60: protected void exitReference(CtReference e) {
61: CtReference ret = referenceStack.pop();
62: if (ret != e)
63: throw new RuntimeException("Unconsitant Stack");
64: super .exitReference(e);
65: }
66:
67: /**
68: * Pushes the element.
69: */
70: protected void enter(CtElement e) {
71: elementStack.push(e);
72: super .enter(e);
73: }
74:
75: /**
76: * Pushes the element reference.
77: */
78: protected void enterReference(CtReference e) {
79: referenceStack.push(e);
80: super.enterReference(e);
81: }
82: }
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