CtStackScanner


1   package spoon.reflect.visitor;
2   
3   import java.util.Stack  ;
4   
5   import spoon.reflect.declaration.CtElement;
6   import spoon.reflect.reference.CtReference;
7   
8   /**
9    * This class defines a scanner that maintains a scanning stack for contextual
10   * awareness.
11   */
12  public class CtStackScanner extends CtScanner {
13  
14      /**
15       * Default constructor.
16       */
17      public CtStackScanner() {
18      }
19  
20      /**
21       * The stack of elements.
22       */
23      protected Stack  <CtElement> elementStack = new Stack  <CtElement>();
24  
25      /**
26       * The stack of element references.
27       */
28      protected Stack  <CtReference> referenceStack = new Stack  <CtReference>();
29  
30      /**
31       * Pops the element.
32       */
33      protected void exit(CtElement e) {
34          CtElement ret = elementStack.pop();
35          if (ret != e)
36              throw new RuntimeException  ("Unconsitant Stack");
37          super.exit(e);
38      }
39  
40      /**
41       * Pops the element reference.
42       */
43      protected void exitReference(CtReference e) {
44          CtReference ret = referenceStack.pop();
45          if (ret != e)
46              throw new RuntimeException  ("Unconsitant Stack");
47          super.exitReference(e);
48      }
49  
50      /**
51       * Pushes the element.
52       */
53      protected void enter(CtElement e) {
54          elementStack.push(e);
55          super.enter(e);
56      }
57  
58      /**
59       * Pushes the element reference.
60       */
61      protected void enterReference(CtReference e) {
62          referenceStack.push(e);
63          enterReference(e);
64          super.enterReference(e);
65      }
66  }
67
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