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| package net.sourceforge.pmd.rules.strings; |
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| import net.sourceforge.pmd.AbstractRule; |
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4 |
| import net.sourceforge.pmd.ast.ASTAdditiveExpression; |
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| import net.sourceforge.pmd.ast.ASTName; |
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6 |
| import net.sourceforge.pmd.ast.ASTPrimaryExpression; |
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| import net.sourceforge.pmd.ast.ASTPrimaryPrefix; |
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| import net.sourceforge.pmd.ast.Node; |
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| import net.sourceforge.pmd.ast.SimpleJavaNode; |
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10 |
| import net.sourceforge.pmd.symboltable.VariableNameDeclaration; |
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11 |
| |
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12 |
| public class UselessStringValueOf extends AbstractRule { |
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13 |
| |
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14 |
19
| public Object visit(ASTPrimaryPrefix node, Object data) {
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15 |
19
| if (node.jjtGetNumChildren() == 0 ||
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| !(node.jjtGetChild(0) instanceof ASTName)) { |
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17 |
4
| return super.visit(node, data);
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| } |
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| |
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20 |
15
| String image = ((ASTName) node.jjtGetChild(0)).getImage();
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21 |
| |
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22 |
15
| if ("String.valueOf".equals(image)) {
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23 |
6
| Node parent = node.jjtGetParent();
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24 |
6
| if (parent.jjtGetNumChildren() != 2) {
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25 |
0
| return super.visit(node, data);
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| } |
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27 |
6
| SimpleJavaNode gp = (SimpleJavaNode) parent.jjtGetParent();
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28 |
6
| if (parent instanceof ASTPrimaryExpression &&
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| gp instanceof ASTAdditiveExpression && |
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| "+".equals(gp.getImage())) { |
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31 |
5
| boolean ok = false;
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32 |
5
| if (gp.jjtGetChild(0) == parent) {
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33 |
2
| ok = !isPrimitive(gp.jjtGetChild(1));
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| } else { |
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35 |
3
| for (int i = 0; !ok && gp.jjtGetChild(i) != parent; i++) {
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36 |
3
| ok = !isPrimitive(gp.jjtGetChild(i));
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37 |
| } |
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38 |
| } |
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39 |
5
| if (ok) {
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40 |
2
| super.addViolation(data, node);
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41 |
2
| return data;
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42 |
| } |
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43 |
| } |
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44 |
| } |
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45 |
13
| return super.visit(node, data);
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46 |
| } |
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47 |
| |
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48 |
5
| private static boolean isPrimitive(Node parent) {
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49 |
5
| boolean result = false;
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50 |
5
| if (parent instanceof ASTPrimaryExpression &&
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51 |
| parent.jjtGetNumChildren() == 1 && |
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52 |
| parent.jjtGetChild(0) instanceof ASTPrimaryPrefix && |
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53 |
| parent.jjtGetChild(0).jjtGetNumChildren() == 1 && |
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54 |
| parent.jjtGetChild(0).jjtGetChild(0) instanceof ASTName) { |
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55 |
3
| ASTName name = (ASTName) parent.jjtGetChild(0).jjtGetChild(0);
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56 |
3
| if (name.getNameDeclaration() instanceof VariableNameDeclaration) {
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57 |
3
| VariableNameDeclaration nd = (VariableNameDeclaration) name.getNameDeclaration();
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58 |
3
| if (nd.isPrimitiveType()) {
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59 |
3
| result = true;
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60 |
| } |
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61 |
| } |
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62 |
| } |
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63 |
5
| return result;
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64 |
| } |
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65 |
| |
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66 |
| } |