com.puppycrawl.tools.checkstyle.checks

Class DescendantTokenCheck

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.DescendantTokenCheck

All Implemented Interfaces:

Configurable, Contextualizable

Direct Known Subclasses:

MissingCtorCheck, MissingSwitchDefaultCheck

public class DescendantTokenCheck
extends Check

Checks for restricted tokens beneath other tokens.

Examples of how to configure the check:

 <!-- String literal equality check -->
 <module name="DescendantToken">
     <property name="tokens" value="EQUAL,NOT_EQUAL"/>
     <property name="limitedTokens" value="STRING_LITERAL"/>
     <property name="maximumNumber" value="0"/>
     <property name="maximumDepth" value="1"/>
 </module>

 <!-- Switch with no default -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_SWITCH"/>
     <property name="maximumDepth" value="2"/>
     <property name="limitedTokens" value="LITERAL_DEFAULT"/>
     <property name="minimumNumber" value="1"/>
 </module>

 <!-- Assert statement may have side effects -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_ASSERT"/>
     <property name="limitedTokens" value="ASSIGN,DEC,INC,POST_DEC,
     POST_INC,PLUS_ASSIGN,MINUS_ASSIGN,STAR_ASSIGN,DIV_ASSIGN,MOD_ASSIGN,
     BSR_ASSIGN,SR_ASSIGN,SL_ASSIGN,BAND_ASSIGN,BXOR_ASSIGN,BOR_ASSIGN,
     METHOD_CALL"/>
     <property name="maximumNumber" value="0"/>
 </module>

 <!-- Initialiser in for performs no setup - use while instead? -->
 <module name="DescendantToken">
     <property name="tokens" value="FOR_INIT"/>
     <property name="limitedTokens" value="EXPR"/>
     <property name="minimumNumber" value="1"/>
 </module>

 <!-- Condition in for performs no check -->
 <module name="DescendantToken">
     <property name="tokens" value="FOR_CONDITION"/>
     <property name="limitedTokens" value="EXPR"/>
     <property name="minimumNumber" value="1"/>
 </module>

 <!-- Switch within switch -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_SWITCH"/>
     <property name="limitedTokens" value="LITERAL_SWITCH"/>
     <property name="maximumNumber" value="0"/>
     <property name="minimumDepth" value="1"/>
 </module>

 <!-- Return from within a catch or finally block -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_FINALLY,LITERAL_CATCH"/>
     <property name="limitedTokens" value="LITERAL_RETURN"/>
     <property name="maximumNumber" value="0"/>
 </module>

 <!-- Try within catch or finally block -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_CATCH,LITERAL_FINALLY"/>
     <property name="limitedTokens" value="LITERAL_TRY"/>
     <property name="maximumNumber" value="0"/>
 </module>

 <!-- Too many cases within a switch -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_SWITCH"/>
     <property name="limitedTokens" value="LITERAL_CASE"/>
     <property name="maximumDepth" value="2"/>
     <property name="maximumNumber" value="10"/>
 </module>

 <!-- Too many local variables within a method -->
 <module name="DescendantToken">
     <property name="tokens" value="METHOD_DEF"/>
     <property name="limitedTokens" value="VARIABLE_DEF"/>
     <property name="maximumDepth" value="2"/>
     <property name="maximumNumber" value="10"/>
 </module>

 <!-- Too many returns from within a method -->
 <module name="DescendantToken">
     <property name="tokens" value="METHOD_DEF"/>
     <property name="limitedTokens" value="LITERAL_RETURN"/>
     <property name="maximumNumber" value="3"/>
 </module>

 <!-- Too many fields within an interface -->
 <module name="DescendantToken">
     <property name="tokens" value="INTERFACE_DEF"/>
     <property name="limitedTokens" value="VARIABLE_DEF"/>
     <property name="maximumDepth" value="2"/>
     <property name="maximumNumber" value="0"/>
 </module>

 <!-- Limit the number of exceptions a method can throw -->
 <module name="DescendantToken">
     <property name="tokens" value="LITERAL_THROWS"/>
     <property name="limitedTokens" value="IDENT"/>
     <property name="maximumNumber" value="1"/>
 </module>

 <!-- Limit the number of expressions in a method -->
 <module name="DescendantToken">
     <property name="tokens" value="METHOD_DEF"/>
     <property name="limitedTokens" value="EXPR"/>
     <property name="maximumNumber" value="200"/>
 </module>

 <!-- Disallow empty statements -->
 <module name="DescendantToken">
     <property name="tokens" value="EMPTY_STAT"/>
     <property name="limitedTokens" value="EMPTY_STAT"/>
     <property name="maximumNumber" value="0"/>
     <property name="maximumDepth" value="0"/>
     <property name="maximumMessage"
         value="Empty statement is not allowed."/>
 </module>

 <!-- Too many fields within a class -->
 <module name="DescendantToken">
     <property name="tokens" value="CLASS_DEF"/>
     <property name="limitedTokens" value="VARIABLE_DEF"/>
     <property name="maximumDepth" value="2"/>
     <property name="maximumNumber" value="10"/>
 </module>
 

Author:

Tim Tyler <tim@tt1.org>, Rick Giles

Constructor Summary

Constructors

Constructor and Description
DescendantTokenCheck()

Method Summary

Modifier and Type	Method and Description
int[]	getAcceptableTokens() The configurable token set.
int[]	getDefaultTokens() Returns the default token a check is interested in.
void	setLimitedTokens(String[] aLimitedTokens) Sets the tokens which occurance as descendant is limited.
void	setMaximumDepth(int aMaximumDepth) Sets the maximum depth for descendant counts.
void	setMaximumMessage(String aMessage) Sets the error message for maximum count exceeded.
void	setMaximumNumber(int aMaximumNumber) Sets a maximum count for descendants.
void	setMinimumDepth(int aMinimumDepth) Sets the mimimum depth for descendant counts.
void	setMinimumMessage(String aMessage) Sets the error message for minimum count not reached.
void	setMinimumNumber(int aMinimumNumber) Sets a minimum count for descendants.
void	visitToken(DetailAST aAST) Called to process a token.

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

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

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

getId, getMessageBundle, getSeverity, getSeverityLevel, log, log, log, log, log, log, log, log, log, setId, 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

DescendantTokenCheck

public DescendantTokenCheck()

Method Detail

getDefaultTokens

public int[] getDefaultTokens()

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:

TokenTypes

visitToken

public void visitToken(DetailAST aAST)

Called to process a token.

Overrides:

visitToken in class Check

Parameters:

aAST - the token to process

getAcceptableTokens

public int[] getAcceptableTokens()

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.

Overrides:

getAcceptableTokens in class Check

Returns:

the token set this check is designed for.

See Also:

TokenTypes

setLimitedTokens

public void setLimitedTokens(String[] aLimitedTokens)

Sets the tokens which occurance as descendant is limited.

Parameters:

aLimitedTokens - - list of tokens to ignore.

setMinimumDepth

public void setMinimumDepth(int aMinimumDepth)

Sets the mimimum depth for descendant counts.

Parameters:

aMinimumDepth - the mimimum depth for descendant counts.

setMaximumDepth

public void setMaximumDepth(int aMaximumDepth)

Sets the maximum depth for descendant counts.

Parameters:

aMaximumDepth - the maximum depth for descendant counts.

setMinimumNumber

public void setMinimumNumber(int aMinimumNumber)

Sets a minimum count for descendants.

Parameters:

aMinimumNumber - the minimum count for descendants.

setMaximumNumber

public void setMaximumNumber(int aMaximumNumber)

Sets a maximum count for descendants.

Parameters:

aMaximumNumber - the maximum count for descendants.

setMinimumMessage

public void setMinimumMessage(String aMessage)

Sets the error message for minimum count not reached.

Parameters:

aMessage - the error message for minimum count not reached. Used as a MessageFormat pattern with arguments

• {0} - token count
• {1} - minimum number
• {2} - name of token
• {3} - name of limited token

setMaximumMessage

public void setMaximumMessage(String aMessage)

Sets the error message for maximum count exceeded.

Parameters:

aMessage - the error message for maximum count exceeded. Used as a MessageFormat pattern with arguments

• {0} - token count
• {1} - maximum number
• {2} - name of token
• {3} - name of limited token