Package com.puppycrawl.tools.checkstyle.checks.indentation

Class LambdaHandler

java.lang.Object

com.puppycrawl.tools.checkstyle.checks.indentation.AbstractExpressionHandler

com.puppycrawl.tools.checkstyle.checks.indentation.LambdaHandler

public class LambdaHandler
extends AbstractExpressionHandler

Handler for lambda expressions.

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	isLambdaCorrectlyIndented	Checks whether the lambda is correctly indented, this variable get its value from checking the lambda handler's indentation, and it is being used in aligning the lambda's children.

Constructor Summary

Constructors

Constructor	Description
LambdaHandler(IndentationCheck indentCheck, DetailAST ast, AbstractExpressionHandler parent)	Construct an instance of this handler with the given indentation check, abstract syntax tree, and parent handler.

Method Summary

Modifier and Type	Method	Description
void	checkIndentation()	Check the indentation of the expression we are handling.
private void	checkLineWrappedLambda(boolean isSwitchRuleLambda, int mainAstColumnNo)	This method checks a line wrapped lambda, whether it is a lambda expression or switch rule lambda.
private void	checkSingleStatementSwitchRuleIndentation(boolean isLambdaFirstInLine)	Checks the indentation of statements inside a single-statement switch rule when the statement is not on the same line as the lambda operator (->).
protected IndentLevel	getIndentImpl()	Compute the indentation amount for this handler.
IndentLevel	getSuggestedChildIndent(AbstractExpressionHandler child)	Indentation level suggested for a child element.
private boolean	isNonAcceptableIndent(int astColumnNo, IndentLevel level)	Checks that given indent is acceptable or not.
private boolean	isSameLineAsSwitch(DetailAST node)	Checks if the current LAMBDA node is placed on the same line as the given SWITCH_LITERAL node.

Methods inherited from class com.puppycrawl.tools.checkstyle.checks.indentation.AbstractExpressionHandler

checkChildren, checkExpressionSubtree, checkLeftParen, checkModifiers, checkRightParen, checkWrappingIndentation, checkWrappingIndentation, expandedTabsColumnNo, findSubtreeAst, getBasicOffset, getBraceAdjustment, getFirstAstNode, getFirstLine, getFirstToken, getIndent, getIndentCheck, getLineStart, getLineStart, getMainAst, getParent, isOnStartOfLine, logError, logError, shouldIncreaseIndent

Methods inherited from class java.lang.Object

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

Field Details

isLambdaCorrectlyIndented

private boolean isLambdaCorrectlyIndented

Checks whether the lambda is correctly indented, this variable get its value from checking the lambda handler's indentation, and it is being used in aligning the lambda's children. A true value depicts lambda is correctly aligned without giving any errors. This is updated to false where there is any Indentation error log.

Constructor Details

LambdaHandler

public LambdaHandler(IndentationCheck indentCheck,
 DetailAST ast,
 AbstractExpressionHandler parent)

Construct an instance of this handler with the given indentation check, abstract syntax tree, and parent handler.

Parameters:

indentCheck - the indentation check

ast - the abstract syntax tree

parent - the parent handler

Method Details

getSuggestedChildIndent

public IndentLevel getSuggestedChildIndent(AbstractExpressionHandler child)

Description copied from class: AbstractExpressionHandler

Indentation level suggested for a child element. Children don't have to respect this, but most do.

Overrides:

getSuggestedChildIndent in class AbstractExpressionHandler

Parameters:

child - child AST (so suggestion level can differ based on child type)

Returns:

suggested indentation for child

getIndentImpl

protected IndentLevel getIndentImpl()

Compute the indentation amount for this handler..

Overrides:

getIndentImpl in class AbstractExpressionHandler

Returns:

the expected indentation amount

checkIndentation

public void checkIndentation()

Description copied from class: AbstractExpressionHandler

Check the indentation of the expression we are handling.

Specified by:

checkIndentation in class AbstractExpressionHandler

isNonAcceptableIndent

private boolean isNonAcceptableIndent(int astColumnNo,
 IndentLevel level)

Checks that given indent is acceptable or not.

Parameters:

astColumnNo - indent value to check

level - indent level

Returns:

true if indent is not acceptable

checkLineWrappedLambda

private void checkLineWrappedLambda(boolean isSwitchRuleLambda,
 int mainAstColumnNo)

This method checks a line wrapped lambda, whether it is a lambda expression or switch rule lambda.

Parameters:

isSwitchRuleLambda - if mainAst is a switch rule lambda

mainAstColumnNo - the column number of the lambda we are checking

checkSingleStatementSwitchRuleIndentation

private void checkSingleStatementSwitchRuleIndentation(boolean isLambdaFirstInLine)

Checks the indentation of statements inside a single-statement switch rule when the statement is not on the same line as the lambda operator (->). This applies to single-statement switch rules without curly braces {}. Example:

 case ONE ->
     1;
 

Parameters:

isLambdaFirstInLine - if -> is the first element on the line

isSameLineAsSwitch

private boolean isSameLineAsSwitch(DetailAST node)

Checks if the current LAMBDA node is placed on the same line as the given SWITCH_LITERAL node.

Parameters:

node - the SWITCH_LITERAL node to compare with

Returns:

true if the current LAMBDA node is on the same line as the given SWITCH_LITERAL node