Package com.puppycrawl.tools.checkstyle.checks.whitespace

Class OperatorWrapCheck

java.lang.Object

com.puppycrawl.tools.checkstyle.AbstractAutomaticBean

com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter

com.puppycrawl.tools.checkstyle.api.AbstractCheck

com.puppycrawl.tools.checkstyle.checks.whitespace.OperatorWrapCheck

All Implemented Interfaces:

Configurable, Contextualizable

public class OperatorWrapCheck
extends AbstractCheck

Checks the policy on how to wrap lines on operators.

See the Java Language Specification for more information about instanceof operator.

• Property option - Specify policy on how to wrap lines. Type is com.puppycrawl.tools.checkstyle.checks.whitespace.WrapOption. Default value is nl.
• Property tokens - tokens to check Type is java.lang.String[]. Validation type is tokenSet. Default value is: QUESTION, COLON, EQUAL, NOT_EQUAL, DIV, PLUS, MINUS, STAR, MOD, SR, BSR, GE, GT, SL, LE, LT, BXOR, BOR, LOR, BAND, LAND, TYPE_EXTENSION_AND, LITERAL_INSTANCEOF.

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

• line.new
• line.previous

Since:

3.0

Nested Class Summary

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

AbstractAutomaticBean.OutputStreamOptions

Field Summary

Fields

Modifier and Type	Field	Description
static String	MSG_LINE_NEW	A key is pointing to the warning message text in "messages.properties" file.
static String	MSG_LINE_PREVIOUS	A key is pointing to the warning message text in "messages.properties" file.
private WrapOption	option	Specify policy on how to wrap lines.

Constructor Summary

Constructors

Constructor	Description
OperatorWrapCheck()

Method Summary

Modifier and Type	Method	Description
private static DetailAST	adjustParens(DetailAST node, UnaryOperator<DetailAST> step)	Finds matching parentheses among siblings.
int[]	getAcceptableTokens()	The configurable token set.
int[]	getDefaultTokens()	Returns the default token a check is interested in.
private static DetailAST	getLeftNode(DetailAST node)	Returns the left neighbour of a binary operator.
int[]	getRequiredTokens()	The tokens that this check must be registered for.
private static DetailAST	getRightNode(DetailAST node)	Returns the right neighbour of a binary operator.
private static boolean	isAssignToVariable(DetailAST node)	Checks if a node is TokenTypes.ASSIGN to a variable or resource.
private static boolean	isColonFromLabel(DetailAST node)	Checks if a node is TokenTypes.COLON from a label, switch case of default.
private static boolean	isEndOfLineModeViolation(DetailAST ast)	Checks whether operator violates WrapOption.EOL mode.
private static boolean	isInPatternDefinition(DetailAST node)	Ascends AST to determine if given node is part of a pattern definition.
private static boolean	isNewLineModeViolation(DetailAST ast)	Checks whether operator violates WrapOption.NL mode.
private static boolean	isTargetNode(DetailAST node)	Filters some false tokens that this check should ignore.
void	setOption(String optionStr)	Setter to specify policy on how to wrap lines.
void	visitToken(DetailAST ast)	Called to process a token.

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

beginTree, clearViolations, destroy, finishTree, getFileContents, getFilePath, getLine, getLineCodePoints, getLines, getTabWidth, getTokenNames, getViolations, init, isCommentNodesRequired, leaveToken, 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.AbstractAutomaticBean

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_LINE_NEW

public static final String MSG_LINE_NEW

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

See Also:

Constant Field Values

MSG_LINE_PREVIOUS

public static final String MSG_LINE_PREVIOUS

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

See Also:

Constant Field Values

option

private WrapOption option

Specify policy on how to wrap lines.

Constructor Detail

OperatorWrapCheck

public OperatorWrapCheck()

Method Detail

setOption

public void setOption(String optionStr)

Setter to specify policy on how to wrap lines.

Parameters:

optionStr - string to decode option from

Throws:

IllegalArgumentException - if unable to decode

Since:

3.0

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

visitToken

public void visitToken(DetailAST ast)

Description copied from class: AbstractCheck

Called to process a token.

Overrides:

visitToken in class AbstractCheck

Parameters:

ast - the token to process

isTargetNode

private static boolean isTargetNode(DetailAST node)

Filters some false tokens that this check should ignore.

Parameters:

node - the node to check

Returns:

true for all nodes this check should validate

isNewLineModeViolation

private static boolean isNewLineModeViolation(DetailAST ast)

Checks whether operator violates WrapOption.NL mode.

Parameters:

ast - the DetailAst of an operator

Returns:

true if mode does not match

isEndOfLineModeViolation

private static boolean isEndOfLineModeViolation(DetailAST ast)

Checks whether operator violates WrapOption.EOL mode.

Parameters:

ast - the DetailAst of an operator

Returns:

true if mode does not match

isColonFromLabel

private static boolean isColonFromLabel(DetailAST node)

Checks if a node is TokenTypes.COLON from a label, switch case of default.

Parameters:

node - the node to check

Returns:

true if node matches

isAssignToVariable

private static boolean isAssignToVariable(DetailAST node)

Checks if a node is TokenTypes.ASSIGN to a variable or resource.

Parameters:

node - the node to check

Returns:

true if node matches

getLeftNode

private static DetailAST getLeftNode(DetailAST node)

Returns the left neighbour of a binary operator. This is the rightmost grandchild of the left child or sibling. For the assign operator the return value is the variable name.

Parameters:

node - the binary operator

Returns:

nearest node from left

isInPatternDefinition

private static boolean isInPatternDefinition(DetailAST node)

Ascends AST to determine if given node is part of a pattern definition.

Parameters:

node - the node to check

Returns:

true if node is in pattern definition

getRightNode

private static DetailAST getRightNode(DetailAST node)

Returns the right neighbour of a binary operator. This is the leftmost grandchild of the right child or sibling. For the ternary operator this is the node between ? and : .

Parameters:

node - the binary operator

Returns:

nearest node from right

adjustParens

private static DetailAST adjustParens(DetailAST node,
                                      UnaryOperator<DetailAST> step)

Finds matching parentheses among siblings. If the given node is not TokenTypes.LPAREN nor TokenTypes.RPAREN, the method adjusts nothing. This method is for handling case like (condition && (condition || condition2 || condition3) && condition4 && condition3)

Parameters:

node - the node to adjust

step - the node transformer, should be DetailAST.getPreviousSibling() or DetailAST.getNextSibling()

Returns:

adjusted node