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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.ASTArgumentList;
6   import net.sourceforge.pmd.ast.ASTCastExpression;
7   import net.sourceforge.pmd.ast.ASTCatchStatement;
8   import net.sourceforge.pmd.ast.ASTClassOrInterfaceType;
9   import net.sourceforge.pmd.ast.ASTName;
10  import net.sourceforge.pmd.ast.ASTPrimaryExpression;
11  import net.sourceforge.pmd.ast.ASTPrimaryPrefix;
12  import net.sourceforge.pmd.ast.ASTThrowStatement;
13  import net.sourceforge.pmd.ast.SimpleNode;
14  import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
15  import org.jaxen.JaxenException;
16  
17  import java.util.Iterator;
18  import java.util.List;
19  import java.util.Map;
20  
21  public class PreserveStackTrace extends AbstractRule {
22  
23  	public Object visit(ASTCatchStatement node, Object data) {
24          String target = (((SimpleNode) node.jjtGetChild(0).jjtGetChild(1)).getImage());
25          List lstThrowStatements = node.findChildrenOfType(ASTThrowStatement.class);
26          for (Iterator iter = lstThrowStatements.iterator(); iter.hasNext();) {
27              ASTThrowStatement throwStatement = (ASTThrowStatement) iter.next();
28              SimpleNode sn = (SimpleNode) throwStatement.jjtGetChild(0).jjtGetChild(0);
29              if (sn.getClass().equals(ASTCastExpression.class)) {
30                  ASTPrimaryExpression expr = (ASTPrimaryExpression) sn.jjtGetChild(1);
31                  if (expr.jjtGetNumChildren() > 1 && expr.jjtGetChild(1).getClass().equals(ASTPrimaryPrefix.class)) {
32                      RuleContext ctx = (RuleContext) data;
33                      addViolation(ctx, throwStatement);
34                  }
35                  continue;
36              }
37              ASTArgumentList args = (ASTArgumentList) throwStatement.getFirstChildOfType(ASTArgumentList.class);
38  
39              if (args != null) {
40                  ck(data, target, throwStatement, args);
41              } else if (args == null) {
42                  SimpleNode child = (SimpleNode) throwStatement.jjtGetChild(0);
43                  while (child != null && child.jjtGetNumChildren() > 0
44                          && !child.getClass().equals(ASTName.class)) {
45                      child = (SimpleNode) child.jjtGetChild(0);
46                  }
47                  if (child != null){
48                      if( child.getClass().equals(ASTName.class) && (!target.equals(child.getImage()) && !child.hasImageEqualTo(target + ".fillInStackTrace"))) {
49  	                    Map vars = ((ASTName) child).getScope().getVariableDeclarations();
50  	                    for (Iterator i = vars.keySet().iterator(); i.hasNext();) {
51  	                        VariableNameDeclaration decl = (VariableNameDeclaration) i.next();
52  	                        args = (ASTArgumentList) ((SimpleNode) decl.getNode().jjtGetParent())
53  	                                .getFirstChildOfType(ASTArgumentList.class);
54  	                        if (args != null) {
55  	                            ck(data, target, throwStatement, args);
56  	                        }
57  	                    }
58                      } else if(child.getClass().equals(ASTClassOrInterfaceType.class)){
59          				addViolation((RuleContext) data, throwStatement);
60                      }
61                  }
62              }
63          }
64          return super.visit(node, data);
65      }
66  
67  	private void ck(Object data, String target,
68  			ASTThrowStatement throwStatement, ASTArgumentList args) {
69  		try {
70  			List lst = args.findChildNodesWithXPath("//Name[@Image='" + target
71  					+ "']");
72  			if (lst.isEmpty()) {
73  				RuleContext ctx = (RuleContext) data;
74  				addViolation(ctx, throwStatement);
75  			}
76  		} catch (JaxenException e) {
77  			e.printStackTrace();
78  		}
79  	}
80  }