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.RuleContext;
8 import net.sourceforge.pmd.ast.ASTClassOrInterfaceDeclaration;
9 import net.sourceforge.pmd.ast.ASTCompilationUnit;
10 import net.sourceforge.pmd.ast.ASTConstructorDeclaration;
11 import net.sourceforge.pmd.ast.ASTFieldDeclaration;
12 import net.sourceforge.pmd.ast.ASTMethodDeclaration;
13
14 public class UseSingleton extends AbstractRule {
15
16 private boolean isOK;
17 private int methodCount;
18
19 public Object visit(ASTCompilationUnit cu, Object data) {
20 methodCount = 0;
21 isOK = false;
22 Object result = cu.childrenAccept(this, data);
23 if (!isOK && methodCount > 0) {
24 RuleContext ctx = (RuleContext) data;
25 ctx.getReport().addRuleViolation(createRuleViolation(ctx, cu));
26 }
27
28 return result;
29 }
30
31 public Object visit(ASTFieldDeclaration decl, Object data) {
32 if (!decl.isStatic()) {
33 isOK = true;
34 }
35 return data;
36 }
37
38 public Object visit(ASTConstructorDeclaration decl, Object data) {
39 if (decl.isPrivate()) {
40 isOK = true;
41 }
42 return data;
43 }
44
45 public Object visit(ASTClassOrInterfaceDeclaration decl, Object data) {
46 if (decl.isAbstract()) {
47 isOK = true;
48 }
49 return super.visit(decl, data);
50 }
51
52 public Object visit(ASTMethodDeclaration decl, Object data) {
53 methodCount++;
54
55 if (!isOK && !decl.isStatic()) {
56 isOK = true;
57 }
58
59 return data;
60 }
61
62 }