ReferenceQueryVisitor


1   package spoon.reflect.visitor;
2   
3   import java.util.ArrayList  ;
4   import java.util.List  ;
5   
6   import spoon.reflect.reference.CtReference;
7   
8   /**
9    * A simple visitor that takes a reference filter and returns all the references
10   * that match it.
11   */
12  
13  public class ReferenceQueryVisitor<T extends CtReference> extends CtScanner {
14      ReferenceFilter<T> filter;
15  
16      List  <T> result = new ArrayList  <T>();
17  
18      /**
19       * Constructs a reference query visitor with a given reference filter.
20       */
21      public ReferenceQueryVisitor(ReferenceFilter<T> filter) {
22          super();
23          this.filter = filter;
24      }
25  
26      /**
27       * Gets the result (references matching the filter).
28       */
29      public List  <T> getResult() {
30          return result;
31      }
32  
33      @SuppressWarnings  ("unchecked")
34      @Override  
35      public void scan(CtReference reference) {
36          if (reference == null)
37              return;
38          if (filter.getType().isAssignableFrom(reference.getClass())) {
39              if (filter.matches((T) reference)) {
40                  result.add((T) reference);
41              }
42          }
43          super.scan(reference);
44      }
45  }

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