com.puppycrawl.tools.checkstyle.checks.design

Class InterfaceIsTypeCheck

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.design.InterfaceIsTypeCheck

All Implemented Interfaces:

Configurable, Contextualizable

public final class InterfaceIsTypeCheck
extends Check

Implements Bloch, Effective Java, Item 17 - Use Interfaces only to define types.

An interface should describe a type, it is therefore inappropriate to define an interface that does not contain any methods but only constants.

The check can be configured to also disallow marker interfaces like java.io.Serializable, that do not contain methods or constants at all.

Author:

lkuehne

Constructor Summary

Constructors

Constructor and Description
InterfaceIsTypeCheck()

Method Summary

Methods

Modifier and Type	Method and Description
int[]	getDefaultTokens() Returns the default token a check is interested in.
int[]	getRequiredTokens() The tokens that this check must be registered for.
void	setAllowMarkerInterfaces(boolean flag) Controls whether marker interfaces like Serializable are allowed.
void	visitToken(DetailAST ast) Called to process a token.

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

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

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

getCustomMessages, getId, getMessageBundle, getSeverity, getSeverityLevel, 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

InterfaceIsTypeCheck

public InterfaceIsTypeCheck()

Method Detail

getDefaultTokens

public int[] getDefaultTokens()

Description copied from class: Check

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

getRequiredTokens

public int[] getRequiredTokens()

Description copied from class: Check

The tokens that this check must be registered for.

Overrides:

getRequiredTokens in class Check

Returns:

the token set this must be registered for.

See Also:

TokenTypes

visitToken

public void visitToken(DetailAST ast)

Description copied from class: Check

Called to process a token.

Overrides:

visitToken in class Check

Parameters:

ast - the token to process

setAllowMarkerInterfaces

public void setAllowMarkerInterfaces(boolean flag)

Controls whether marker interfaces like Serializable are allowed.

Parameters:

flag - whether to allow marker interfaces or not