com.puppycrawl.tools.checkstyle.checks.coding

Class NestedIfDepthCheck

java.lang.Object

com.puppycrawl.tools.checkstyle.api.AutomaticBean

com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter

com.puppycrawl.tools.checkstyle.api.AbstractCheck

com.puppycrawl.tools.checkstyle.checks.coding.NestedIfDepthCheck

All Implemented Interfaces:

Configurable, Contextualizable

public final class NestedIfDepthCheck
extends AbstractCheck

Restricts nested if-else blocks to a specified depth.

• Property max - Specify maximum allowed nesting depth. Type is int. Default value is 1.

To configure the check:

 <module name="NestedIfDepth"/>
 

Valid code example:

 if (true) {
     if (true) {} // OK
     else {}
 }
 

Invalid code example:

 if (true) {
     if (true) {
         if (true) { // violation, nested if-else depth is 2 (max allowed is 1)
         }
     }
 }
 

To configure the check to allow nesting depth 3:

 <module name="NestedIfDepth">
   <property name="max" value="3"/>
 </module>
 

Valid code example:

 if (true) {
    if (true) {
       if (true) {
          if (true) {} // OK
          else {}
       }
    }
 }
 

Invalid code example:

 if (true) {
    if (true) {
       if (true) {
          if (true) {
             if (true) { // violation, nested if-else depth is 4 (max allowed is 3)
                if (true) {} // violation, nested if-else depth is 5 (max allowed is 3)
                else {}
             }
          }
       }
    }
 }
 

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

• nested.if.depth

Since:

3.2

Nested Class Summary

Nested classes/interfaces inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean

AutomaticBean.OutputStreamOptions

Field Summary

Fields

Modifier and Type	Field and Description
private int	depth Current nesting depth.
private int	max Specify maximum allowed nesting depth.
static java.lang.String	MSG_KEY A key is pointing to the warning message text in "messages.properties" file.

Constructor Summary

Constructors

Constructor and Description
NestedIfDepthCheck()

Method Summary

Modifier and Type	Method and Description
void	beginTree(DetailAST rootAST) Called before the starting to process a tree.
int[]	getAcceptableTokens() The configurable token set.
int[]	getDefaultTokens() Returns the default token a check is interested in.
int[]	getRequiredTokens() The tokens that this check must be registered for.
void	leaveToken(DetailAST literalIf) Called after all the child nodes have been process.
void	setMax(int max) Setter to specify maximum allowed nesting depth.
void	visitToken(DetailAST literalIf) Called to process a token.

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

clearViolations, destroy, finishTree, getFileContents, getLine, getLineCodePoints, getLines, getTabWidth, getTokenNames, getViolations, init, isCommentNodesRequired, log, log, log, setFileContents, setTabWidth, setTokens

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

finishLocalSetup, getCustomMessages, getId, getMessageBundle, getSeverity, getSeverityLevel, setId, setSeverity

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

configure, contextualize, getConfiguration, setupChild

Methods inherited from class java.lang.Object

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

Field Detail

MSG_KEY

public static final java.lang.String MSG_KEY

A key is pointing to the warning message text in "messages.properties" file.

See Also:

Constant Field Values

max

private int max

Specify maximum allowed nesting depth.

depth

private int depth

Current nesting depth.

Constructor Detail

NestedIfDepthCheck

public NestedIfDepthCheck()

Method Detail

setMax

public void setMax(int max)

Setter to specify maximum allowed nesting depth.

Parameters:

max - maximum allowed nesting depth.

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:

TokenTypes

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:

TokenTypes

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:

TokenTypes

beginTree

public void beginTree(DetailAST rootAST)

Description copied from class: AbstractCheck

Called before the starting to process a tree. Ideal place to initialize information that is to be collected whilst processing a tree.

Overrides:

beginTree in class AbstractCheck

Parameters:

rootAST - the root of the tree

visitToken

public void visitToken(DetailAST literalIf)

Description copied from class: AbstractCheck

Called to process a token.

Overrides:

visitToken in class AbstractCheck

Parameters:

literalIf - the token to process

leaveToken

public void leaveToken(DetailAST literalIf)

Description copied from class: AbstractCheck

Called after all the child nodes have been process.

Overrides:

leaveToken in class AbstractCheck

Parameters:

literalIf - the token leaving