CompositeFilter


1   package spoon.support.query;
2   
3   import spoon.reflect.declaration.CtElement;
4   import spoon.reflect.visitor.Filter;
5   
6   /**
7    * This class defines a composite filter, which can compose several filters
8    * together by using {@link spoon.support.query.FilteringOperator}.
9    * 
10   * @author Renaud Pawlak
11   */
12  public class CompositeFilter<T extends CtElement> implements Filter<T> {
13  
14      /**
15       * Defines the matching using {@link spoon.support.query.FilteringOperator}.
16       */
17      public boolean matches(T element) {
18          switch (operator) {
19              case INTERSECTION:
20                  for (Filter<T> f : filters) {
21                      if (!f.matches(element))
22                          return false;
23                  }
24                  return true;
25              case UNION:
26                  for (Filter<T> f : filters) {
27                      if (f.matches(element))
28                          return true;
29                  }
30                  return false;
31              case SUBSTRACTION:
32                  if (filters.length == 0)
33                      return false;
34                  if (!filters[0].matches(element))
35                      return false;
36                  for (int i = 1; i < filters.length; i++) {
37                      if (filters[i].matches(element))
38                          return false;
39                  }
40                  return true;
41              default:
42                  return false;
43          }
44      }
45  
46      Filter<T>[] filters;
47  
48      FilteringOperator operator;
49  
50      /**
51       * Creates a new composite filter.
52       * 
53       * @param operator the operator used to compose the filters together
54       * @param filters the filters to be composed
55       */
56      public CompositeFilter(FilteringOperator operator, Filter<T>... filters) {
57          this.filters = filters;
58          this.operator = operator;
59      }
60  
61      @SuppressWarnings  ("unchecked")
62      public Class  <T> getType() {
63          return (Class  <T>) CtElement.class;
64      }
65  
66  }
67
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