1 package net.sourceforge.pmd.rules.design;
2
3 import net.sourceforge.pmd.AbstractRule;
4 import net.sourceforge.pmd.RuleContext;
5 import net.sourceforge.pmd.ast.ASTCatch;
6 import net.sourceforge.pmd.ast.ASTClassOrInterfaceType;
7 import net.sourceforge.pmd.ast.ASTThrowStatement;
8 import net.sourceforge.pmd.ast.ASTTryStatement;
9 import net.sourceforge.pmd.ast.ASTType;
10
11 import java.util.Iterator;
12 import java.util.List;
13
14 /***
15 * Catches the use of exception statements as a flow control device.
16 *
17 * @author Will Sargent
18 */
19 public class ExceptionAsFlowControl extends AbstractRule {
20
21 public Object visit(ASTThrowStatement node, Object data) {
22
23 String throwName = node.getFirstClassOrInterfaceTypeImage();
24
25 ASTTryStatement parent = (ASTTryStatement) node.getFirstParentOfType(ASTTryStatement.class);
26 if (parent == null) {
27 return data;
28 }
29 for (parent = (ASTTryStatement) parent.getFirstParentOfType(ASTTryStatement.class)
30 ; parent != null
31 ; parent = (ASTTryStatement) parent.getFirstParentOfType(ASTTryStatement.class)) {
32
33 List list = parent.getCatchBlocks();
34 for (Iterator iter = list.iterator(); iter.hasNext();) {
35 ASTCatch catchStmt = (ASTCatch) iter.next();
36 ASTType type = (ASTType) catchStmt.getFormalParameter().findChildrenOfType(ASTType.class).get(0);
37 ASTClassOrInterfaceType name = (ASTClassOrInterfaceType) type.findChildrenOfType(ASTClassOrInterfaceType.class).get(0);
38
39 if (throwName != null && throwName.equals(name.getImage())) {
40 addViolation((RuleContext) data, name);
41 }
42 }
43 }
44 return data;
45 }
46
47 }