Article:		Custom PMD Rules
Subject:		PMD CUSTOM XPATH RULE
Date:		2005-02-24 01:18:45
From:		PravinD
I am attempting to create a couple of PMD rules. 1) To create a rule that checks for the occurences of String objects and throws a warning if the names of the objects do not start with the letters 'str' 2) To create a rule that checks for open connection objects and throws a warning if these objects remain unclosed. Can someone help me on this or post the xpath rule for the same?

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• PMD CUSTOM XPATH RULE
  2005-02-24 06:09:36  tcopeland [Reply | View]
  
  
  Hi PravinD -
  
  Cool, OK, let's see:
  
  > occurences of String objects and throws a
  > warning if the names of the objects do not
  > start with the letters 'str'
  
  Hm. The XPath rule below will catch field declarations of Strings that don't start with "str":
  
  //FieldDeclaration
  [
  Type/Name[@Image='String']
  and not(starts-with(VariableDeclarator/VariableDeclaratorId/@Image, 'str'))
  ]
  
  and you can write similar ones for parameters and local variable declarations.
  
  
  > checks for open connection objects and
  > throws a warning if these objects remain
  > unclosed.
  
  Check out the CloseConnection rule here:
  
  http://pmd.sourceforge.net/rules/design.html
  
  Yours,
  
  Tom