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1   package net.sourceforge.pmd.rules.strictexception;
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.ASTTryStatement;
8   import net.sourceforge.pmd.ast.ASTType;
9   
10  /***
11   * PMD rule which is going to find <code>catch</code> statements
12   * containing <code>throwable</code> as the type definition.
13   * <p/>
14   *
15   * @author <a mailto:trondandersen@c2i.net>Trond Andersen</a>
16   */
17  public class AvoidCatchingThrowable extends AbstractRule {
18  
19  
20      public Object visit(ASTTryStatement tryStmt, Object o) {
21          // Requires a catch statement
22          if (!tryStmt.hasCatch()) {
23              return super.visit(tryStmt, o);
24          }
25  
26          /* Checking all catch statements */
27          for (int i = 0; i < tryStmt.getCatchBlocks().size(); i++) {
28              evaluateCatch((ASTCatch) tryStmt.getCatchBlocks().get(i), (RuleContext) o);
29          }
30          return super.visit(tryStmt, o);
31      }
32  
33      /***
34       * Checking the catch statement
35       *
36       * @param aCatch      CatchBlock
37       * @param ruleContext
38       */
39      private void evaluateCatch(ASTCatch aCatch, RuleContext ruleContext) {
40          ASTType type = (ASTType) aCatch.getFormalParameter().findChildrenOfType(ASTType.class).get(0);
41          ASTClassOrInterfaceType name = (ASTClassOrInterfaceType) type.findChildrenOfType(ASTClassOrInterfaceType.class).get(0);
42  
43          if (name.getImage().equals("Throwable")) {
44              ruleContext.getReport().addRuleViolation(createRuleViolation(ruleContext, name));
45          }
46      }
47  }