Class ParameterAssignmentCheck
- java.lang.Object
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- com.puppycrawl.tools.checkstyle.AbstractAutomaticBean
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- com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
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- com.puppycrawl.tools.checkstyle.api.AbstractCheck
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- com.puppycrawl.tools.checkstyle.checks.coding.ParameterAssignmentCheck
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- All Implemented Interfaces:
Configurable
,Contextualizable
public final class ParameterAssignmentCheck extends AbstractCheck
Disallows assignment of parameters.Rationale: Parameter assignment is often considered poor programming practice. Forcing developers to declare parameters as final is often onerous. Having a check ensure that parameters are never assigned would give the best of both worlds.
Parent is
com.puppycrawl.tools.checkstyle.TreeWalker
Violation Message Keys:
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parameter.assignment
- Since:
- 3.2
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Nested Class Summary
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Nested classes/interfaces inherited from class com.puppycrawl.tools.checkstyle.AbstractAutomaticBean
AbstractAutomaticBean.OutputStreamOptions
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Field Summary
Fields Modifier and Type Field Description static String
MSG_KEY
A key is pointing to the warning message text in "messages.properties" file.private Set<String>
parameterNames
Current set of parameters.private Deque<Set<String>>
parameterNamesStack
Stack of methods' parameters.
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Constructor Summary
Constructors Constructor Description ParameterAssignmentCheck()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
beginTree(DetailAST rootAST)
Called before the starting to process a tree.private void
checkNestedIdent(DetailAST ast)
Check if nested ident is parameter.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 ast)
Called after all the child nodes have been process.private void
visitLambda(DetailAST lambdaAst)
Creates new set of parameters and store old one in stack.private void
visitLambdaParameters(DetailAST ast)
Creates new parameter set for given lambda expression.private void
visitMethodDef(DetailAST ast)
Creates new set of parameters and store old one in stack.private void
visitMethodParameters(DetailAST ast)
Creates new parameter set for given method.private void
visitParameters(DetailAST parametersAst)
Visits parameter list and adds parameter names to the set.void
visitToken(DetailAST ast)
Called to process a token.-
Methods inherited from class com.puppycrawl.tools.checkstyle.api.AbstractCheck
clearViolations, destroy, finishTree, getFileContents, getFilePath, getLine, getLineCodePoints, getLines, getTabWidth, getTokenNames, getViolations, init, isCommentNodesRequired, log, log, log, setFileContents, setTabWidth, setTokens
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Methods inherited from class com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
finishLocalSetup, getCustomMessages, getId, getMessageBundle, getSeverity, getSeverityLevel, setId, setSeverity
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Methods inherited from class com.puppycrawl.tools.checkstyle.AbstractAutomaticBean
configure, contextualize, getConfiguration, setupChild
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Field Detail
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MSG_KEY
public static final String MSG_KEY
A key is pointing to the warning message text in "messages.properties" file.- See Also:
- Constant Field Values
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parameterNamesStack
private final Deque<Set<String>> parameterNamesStack
Stack of methods' parameters.
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parameterNames
private Set<String> parameterNames
Current set of parameters.
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Constructor Detail
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ParameterAssignmentCheck
public ParameterAssignmentCheck()
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Method Detail
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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 classAbstractCheck
- Returns:
- the default tokens
- See Also:
TokenTypes
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getRequiredTokens
public int[] getRequiredTokens()
Description copied from class:AbstractCheck
The tokens that this check must be registered for.- Specified by:
getRequiredTokens
in classAbstractCheck
- Returns:
- the token set this must be registered for.
- See Also:
TokenTypes
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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 classAbstractCheck
- Returns:
- the token set this check is designed for.
- See Also:
TokenTypes
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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 classAbstractCheck
- Parameters:
rootAST
- the root of the tree
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visitToken
public void visitToken(DetailAST ast)
Description copied from class:AbstractCheck
Called to process a token.- Overrides:
visitToken
in classAbstractCheck
- Parameters:
ast
- the token to process
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leaveToken
public void leaveToken(DetailAST ast)
Description copied from class:AbstractCheck
Called after all the child nodes have been process.- Overrides:
leaveToken
in classAbstractCheck
- Parameters:
ast
- the token leaving
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checkNestedIdent
private void checkNestedIdent(DetailAST ast)
Check if nested ident is parameter.- Parameters:
ast
- parent of node of ident
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visitMethodDef
private void visitMethodDef(DetailAST ast)
Creates new set of parameters and store old one in stack.- Parameters:
ast
- a method to process.
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visitLambda
private void visitLambda(DetailAST lambdaAst)
Creates new set of parameters and store old one in stack.- Parameters:
lambdaAst
- node of typeTokenTypes.LAMBDA
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visitMethodParameters
private void visitMethodParameters(DetailAST ast)
Creates new parameter set for given method.- Parameters:
ast
- a method for process.
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visitLambdaParameters
private void visitLambdaParameters(DetailAST ast)
Creates new parameter set for given lambda expression.- Parameters:
ast
- a lambda expression parameter to process
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visitParameters
private void visitParameters(DetailAST parametersAst)
Visits parameter list and adds parameter names to the set.- Parameters:
parametersAst
- ast node of typeTokenTypes.PARAMETERS
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