1 |
| package net.sourceforge.pmd.rules.design; |
2 |
| |
3 |
| import java.util.Iterator; |
4 |
| import java.util.List; |
5 |
| import java.util.Map; |
6 |
| |
7 |
| import net.sourceforge.pmd.AbstractRule; |
8 |
| import net.sourceforge.pmd.ast.ASTExpression; |
9 |
| import net.sourceforge.pmd.ast.ASTMethodDeclaration; |
10 |
| import net.sourceforge.pmd.ast.ASTName; |
11 |
| import net.sourceforge.pmd.ast.ASTPrimaryExpression; |
12 |
| import net.sourceforge.pmd.ast.ASTPrimarySuffix; |
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| import net.sourceforge.pmd.ast.ASTReturnStatement; |
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| import net.sourceforge.pmd.symboltable.NameOccurrence; |
15 |
| import net.sourceforge.pmd.symboltable.VariableNameDeclaration; |
16 |
| |
17 |
| public class UnnecessaryLocalBeforeReturn extends AbstractRule { |
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| |
19 |
7
| public Object visit(ASTMethodDeclaration meth, Object data) {
|
20 |
| |
21 |
7
| if (meth.isVoid() || meth.isAbstract() || meth.isNative()) {
|
22 |
3
| return data;
|
23 |
| } |
24 |
4
| return super.visit(meth, data);
|
25 |
| } |
26 |
| |
27 |
4
| public Object visit(ASTReturnStatement rtn, Object data) {
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28 |
| |
29 |
4
| ASTName name = (ASTName) rtn.getFirstChildOfType(ASTName.class);
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30 |
4
| if (name == null) {
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31 |
1
| return data;
|
32 |
| } |
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| |
34 |
| |
35 |
3
| if (rtn.findChildrenOfType(ASTExpression.class).size() > 1 || rtn.findChildrenOfType(ASTPrimaryExpression.class).size() > 1 || isMethodCall(rtn)) {
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36 |
2
| return data;
|
37 |
| } |
38 |
| |
39 |
1
| Map vars = name.getScope().getVariableDeclarations();
|
40 |
1
| for (Iterator i = vars.entrySet().iterator(); i.hasNext();) {
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41 |
1
| Map.Entry entry = (Map.Entry) i.next();
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42 |
1
| VariableNameDeclaration key = (VariableNameDeclaration) entry.getKey();
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43 |
1
| List usages = (List) entry.getValue();
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44 |
1
| for (Iterator j = usages.iterator(); j.hasNext();) {
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45 |
1
| NameOccurrence occ = (NameOccurrence) j.next();
|
46 |
1
| if (occ.getLocation().equals(name)) {
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47 |
| |
48 |
1
| if (key.getNode().getBeginLine() == name.getBeginLine() - 1) {
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49 |
1
| String var = name.getImage();
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50 |
1
| if (var.indexOf('.') != -1) {
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51 |
0
| var = var.substring(0, var.indexOf('.'));
|
52 |
| } |
53 |
1
| addViolation(data, rtn, var);
|
54 |
| } |
55 |
| } |
56 |
| } |
57 |
| } |
58 |
1
| return data;
|
59 |
| } |
60 |
| |
61 |
| |
62 |
| |
63 |
| |
64 |
| |
65 |
| |
66 |
| |
67 |
| |
68 |
1
| private boolean isMethodCall(ASTReturnStatement rtn) {
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69 |
1
| List suffix = rtn.findChildrenOfType( ASTPrimarySuffix.class );
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70 |
1
| for ( Iterator iter = suffix.iterator(); iter.hasNext(); ) {
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71 |
0
| ASTPrimarySuffix element = (ASTPrimarySuffix) iter.next();
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72 |
0
| if ( element.isArguments() ) {
|
73 |
0
| return true;
|
74 |
| } |
75 |
| } |
76 |
1
| return false;
|
77 |
| } |
78 |
| } |