com.puppycrawl.tools.checkstyle.checks.coding
Class UnnecessaryParenthesesCheck

java.lang.Object
  com.puppycrawl.tools.checkstyle.api.AutomaticBean
      com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
          com.puppycrawl.tools.checkstyle.api.Check
              com.puppycrawl.tools.checkstyle.checks.coding.UnnecessaryParenthesesCheck

All Implemented Interfaces:

Configurable, Contextualizable

public class UnnecessaryParenthesesCheck

extends Check

Checks if unnecessary parentheses are used in a statement or expression. The check will flag the following with warnings.

     return (x);          // parens around identifier
     return (x + 1);      // parens around return value
     int x = (y / 2 + 1); // parens around assignment rhs
     for (int i = (0); i < 10; i++) {  // parens around literal
     t -= (z + 1);        // parens around assignment rhs

The check is not "type aware", that is to say, it can't tell if parentheses are unnecessary based on the types in an expression. It also doesn't know about operator precedence and associatvity; therefore it won't catch something like

     int x = (a + b) + c;

In the above case, given that a, b, and c are all int variables, the parentheses around a + b are not needed.

Author:

Eric Roe

Constructor Summary

UnnecessaryParenthesesCheck()

Method Summary

int[]	getDefaultTokens() Returns the default token a check is interested in.
void	leaveToken(DetailAST aAST) Called after all the child nodes have been process.
void	visitToken(DetailAST aAST) Called to process a token.

Methods inherited from class com.puppycrawl.tools.checkstyle.api.Check

beginTree, destroy, finishTree, getAcceptableTokens, getClassLoader, getFileContents, getLines, getRequiredTokens, getTabWidth, getTokenNames, init, log, log, setClassLoader, setFileContents, setMessages, setTabWidth, setTokens

Methods inherited from class com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter

getMessageBundle, getSeverity, getSeverityLevel, log, log, log, log, log, log, log, log, log, setSeverity

Methods inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean

configure, contextualize, finishLocalSetup, getConfiguration, setupChild

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UnnecessaryParenthesesCheck

public UnnecessaryParenthesesCheck()

Method Detail

getDefaultTokens

public int[] getDefaultTokens()

Description copied from class: Check

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 Check

Returns:

the default tokens

See Also:

Check

visitToken

public void visitToken(DetailAST aAST)

Description copied from class: Check

Called to process a token.

Overrides:

visitToken in class Check

Parameters:

aAST - the token to process

See Also:

Check

leaveToken

public void leaveToken(DetailAST aAST)

Description copied from class: Check

Called after all the child nodes have been process.

Overrides:

leaveToken in class Check

Parameters:

aAST - the token leaving

See Also:

Check