Class OperatorWrapCheck

All Implemented Interfaces:
Configurable, Contextualizable

public class OperatorWrapCheck extends AbstractCheck

Checks the policy on how to wrap lines on operators.

To configure the check:

 <module name="OperatorWrap"/>
 

Example:

 class Test {
     public static void main(String[] args) {
         String s = "Hello" +
         "World"; // violation, '+' should be on new line

         if (10 ==
                 20) { // violation, '==' should be on new line.
         // body
         }
         if (10
                 ==
                 20) { // ok
         // body
         }

         int c = 10 /
                 5; // violation, '/' should be on new line.

         int d = c
                 + 10; // ok
     }

 }
 

To configure the check for assignment operators at the end of a line:

 <module name="OperatorWrap">
   <property name="tokens"
     value="ASSIGN,DIV_ASSIGN,PLUS_ASSIGN,MINUS_ASSIGN,STAR_ASSIGN,MOD_ASSIGN,
            SR_ASSIGN,BSR_ASSIGN,SL_ASSIGN,BXOR_ASSIGN,BOR_ASSIGN,BAND_ASSIGN"/>
   <property name="option" value="eol"/>
 </module>
 

Example:

 class Test {
     public static void main(String[] args) {
             int b
                     = 10; // violation, '=' should be on previous line
             int c =
                     10; // ok
             b
                     += 10; // violation, '+=' should be on previous line
             b +=
                     10; // ok
             c
                     *= 10; // violation, '*=' should be on previous line
             c *=
                     10; // ok
             c
                     -= 5; // violation, '-=' should be on previous line
             c -=
                     5; // ok
             c
                     /= 2; // violation, '/=' should be on previous line
             c
                     %= 1; // violation, '%=' should be on previous line
             c
                     >>= 1; // violation, '>>=' should be on previous line
             c
                 >>>= 1; // violation, '>>>=' should be on previous line
         }
         public void myFunction() {
             c
                     ^= 1; // violation, '^=' should be on previous line
             c
                     |= 1; // violation, '|=' should be on previous line
             c
                     &=1 ; // violation, '&=' should be on previous line
             c
                     <<= 1; // violation, '<<=' should be on previous line
     }
 }
 

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

  • line.new
  • line.previous
Since:
3.0
  • Field Details

    • MSG_LINE_NEW

      public static final String MSG_LINE_NEW
      A key is pointing to the warning message text in "messages.properties" file.
      See Also:
    • MSG_LINE_PREVIOUS

      public static final String MSG_LINE_PREVIOUS
      A key is pointing to the warning message text in "messages.properties" file.
      See Also:
  • Constructor Details

    • OperatorWrapCheck

      public OperatorWrapCheck()
  • Method Details

    • setOption

      public void setOption(String optionStr)
      Setter to specify policy on how to wrap lines.
      Parameters:
      optionStr - string to decode option from
      Throws:
      IllegalArgumentException - if unable to decode
    • getDefaultTokens

      public int[] getDefaultTokens()
      Description copied from class: AbstractCheck
      Returns the default token a check is interested in. Only used if the configuration for a check does not define the tokens.
      Specified by:
      getDefaultTokens in class AbstractCheck
      Returns:
      the default tokens
      See Also:
    • getAcceptableTokens

      public int[] getAcceptableTokens()
      Description copied from class: AbstractCheck
      The configurable token set. Used to protect Checks against malicious users who specify an unacceptable token set in the configuration file. The default implementation returns the check's default tokens.
      Specified by:
      getAcceptableTokens in class AbstractCheck
      Returns:
      the token set this check is designed for.
      See Also:
    • getRequiredTokens

      public int[] getRequiredTokens()
      Description copied from class: AbstractCheck
      The tokens that this check must be registered for.
      Specified by:
      getRequiredTokens in class AbstractCheck
      Returns:
      the token set this must be registered for.
      See Also:
    • visitToken

      public void visitToken(DetailAST ast)
      Description copied from class: AbstractCheck
      Called to process a token.
      Overrides:
      visitToken in class AbstractCheck
      Parameters:
      ast - the token to process