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1   /***
2    * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
3    */
4   package net.sourceforge.pmd.rules.design;
5   
6   import net.sourceforge.pmd.AbstractRule;
7   import net.sourceforge.pmd.ast.ASTClassOrInterfaceType;
8   import net.sourceforge.pmd.ast.ASTFieldDeclaration;
9   import net.sourceforge.pmd.ast.ASTFormalParameter;
10  import net.sourceforge.pmd.ast.ASTResultType;
11  import net.sourceforge.pmd.ast.Node;
12  
13  import java.util.HashSet;
14  import java.util.Set;
15  
16  public class LooseCoupling extends AbstractRule {
17  
18      private Set implClassNames = new HashSet();
19  
20      public LooseCoupling() {
21          super();
22          implClassNames.add("HashSet");
23          implClassNames.add("HashMap");
24          implClassNames.add("LinkedHashMap");
25          implClassNames.add("LinkedHashSet");
26          implClassNames.add("TreeSet");
27          implClassNames.add("TreeMap");
28          implClassNames.add("Vector");
29          implClassNames.add("java.util.HashSet");
30          implClassNames.add("java.util.HashMap");
31          implClassNames.add("java.util.LinkedHashMap");
32          implClassNames.add("java.util.LinkedHashSet");
33          implClassNames.add("java.util.TreeSet");
34          implClassNames.add("java.util.TreeMap");
35          implClassNames.add("java.util.Vector");
36      }
37  
38      public Object visit(ASTClassOrInterfaceType node, Object data) {
39          Node parent = node.jjtGetParent().jjtGetParent().jjtGetParent();
40          if (implClassNames.contains(node.getImage()) && (parent instanceof ASTFieldDeclaration || parent instanceof ASTFormalParameter || parent instanceof ASTResultType)) {
41              addViolation(data, node, node.getImage());
42          }
43          return data;
44      }
45  }