Package com.puppycrawl.tools.checkstyle.checks.whitespace

Class ParenPadCheck

  • All Implemented Interfaces:
    Configurable, Contextualizable
    public class ParenPadCheck
extends AbstractParenPadCheck

    Checks the policy on the padding of parentheses; that is whether a space is required after a left parenthesis and before a right parenthesis, or such spaces are forbidden. No check occurs at the right parenthesis after an empty for iterator, at the left parenthesis before an empty for initialization, or at the right parenthesis of a try-with-resources resource specification where the last resource variable has a trailing semicolon. Use Check EmptyForIteratorPad to validate empty for iterators and EmptyForInitializerPad to validate empty for initializers. Typecasts are also not checked, as there is TypecastParenPad to validate them.

    To configure the check: 

     <module name="ParenPad"/>

    Example: 

     class Foo {

   int n;

   public void fun() {  // OK
     bar( 1);  // violation, space after left parenthesis
   }

   public void bar(int k ) {  // violation, space before right parenthesis
     while (k > 0) {  // OK
     }

     Test obj = new Test(k);  // OK
   }

   public void fun2() {  // OK
     switch( n) {  // violation, space after left parenthesis
       case 2:
         bar(n);  // OK
       default:
         break;
     }
   }

 }

    To configure the check to require spaces for the parentheses of constructor, method, and super constructor calls: 

     <module name="ParenPad">
   <property name="tokens" value="LITERAL_FOR, LITERAL_CATCH,
     SUPER_CTOR_CALL"/>
   <property name="option" value="space"/>
 </module>

    Example: 

     class Foo {

   int x;

   public Foo(int n) {
   }

   public void fun() {
     try {
       System.out.println(x);
     } catch( IOException e) {  // violation, no space before right parenthesis
     } catch( Exception e ) {  // OK
     }

     for ( int i = 0; i < x; i++ ) {  // OK
     }
   }

 }

 class Bar extends Foo {

   public Bar() {
     super(1 );  // violation, no space after left parenthesis
   }

   public Bar(int k) {
     super( k ); // OK

     for ( int i = 0; i < k; i++) {  // violation, no space before right parenthesis
     }
   }

 }

    The following cases are not checked: 

     for ( ; i < j; i++, j--) // no check after left parenthesis
 for (Iterator it = xs.iterator(); it.hasNext(); ) // no check before right parenthesis
 try (Closeable resource = acquire(); ) // no check before right parenthesis

    Parent is com.puppycrawl.tools.checkstyle.TreeWalker

    Violation Message Keys:

    • ws.followed
    • ws.notFollowed
    • ws.notPreceded
    • ws.preceded
    Since:
    3.0