class TooManyFieldsRule

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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.lang.java.rule.codesize;
5  
6   import java.util.HashMap;
7   import java.util.List;
8   import java.util.Map;
9  
10  import net.sourceforge.pmd.lang.ast.Node;
11  import net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceDeclaration;
12  import net.sourceforge.pmd.lang.java.ast.ASTCompilationUnit;
13  import net.sourceforge.pmd.lang.java.ast.ASTFieldDeclaration;
14  import net.sourceforge.pmd.lang.java.rule.AbstractJavaRule;
15  import net.sourceforge.pmd.lang.rule.properties.IntegerProperty;
16  import net.sourceforge.pmd.util.NumericConstants;
17 
18 
19  public class TooManyFieldsRule extends AbstractJavaRule {
20 
21      private static final int DEFAULT_MAXFIELDS = 15;
22 
23      private Map<String, Integer> stats;
24      private Map<String, ASTClassOrInterfaceDeclaration> nodes;
25 
26      private static final IntegerProperty MAX_FIELDS_DESCRIPTOR = new IntegerProperty(
27      "maxfields", "Max allowable fields",
28      1, 300, DEFAULT_MAXFIELDS, 1.0f
29      );
30     
31      public TooManyFieldsRule() {
32  definePropertyDescriptor(MAX_FIELDS_DESCRIPTOR);
33      }
34 
35      @Override
36      public Object visit(ASTCompilationUnit node, Object data) {
37 
38          int maxFields = getProperty(MAX_FIELDS_DESCRIPTOR);
39 
40          stats = new HashMap<String, Integer>(5);
41          nodes = new HashMap<String, ASTClassOrInterfaceDeclaration>(5);
42 
43          List<ASTFieldDeclaration> l = node.findDescendantsOfType(ASTFieldDeclaration.class);
44 
45          for (ASTFieldDeclaration fd: l) {
46              if (fd.isFinal() && fd.isStatic()) {
47                  continue;
48              }
49              ASTClassOrInterfaceDeclaration clazz = fd.getFirstParentOfType(ASTClassOrInterfaceDeclaration.class);
50              if (clazz != null && !clazz.isInterface()) {
51                  bumpCounterFor(clazz);
52              }
53          }
54          for (String k : stats.keySet()) {
55              int val = stats.get(k);
56              Node n = nodes.get(k);
57              if (val > maxFields) {
58                  addViolation(data, n);
59              }
60          }
61          return data;
62      }
63 
64      private void bumpCounterFor(ASTClassOrInterfaceDeclaration clazz) {
65          String key = clazz.getImage();
66          if (!stats.containsKey(key)) {
67              stats.put(key, NumericConstants.ZERO);
68              nodes.put(key, clazz);
69          }
70          Integer i = Integer.valueOf(stats.get(key) + 1);
71          stats.put(key, i);
72      }
73  }

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