Class IllegalThrowsCheck
- 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.IllegalThrowsCheck
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- All Implemented Interfaces:
Configurable
,Contextualizable
public final class IllegalThrowsCheck extends AbstractCheck
Checks that specified types are not declared to be thrown. Declaring that a method throws
java.lang.Error
orjava.lang.RuntimeException
is almost never acceptable.-
Property
illegalClassNames
- Specify throw class names to reject. Type isjava.lang.String[]
. Default value isError, RuntimeException, Throwable, java.lang.Error, java.lang.RuntimeException, java.lang.Throwable
. -
Property
ignoredMethodNames
- Specify names of methods to ignore. Type isjava.lang.String[]
. Default value isfinalize
. -
Property
ignoreOverriddenMethods
- allow to ignore checking overridden methods (marked withOverride
orjava.lang.Override
annotation). Type isboolean
. Default value istrue
.
To configure the check:
<module name="IllegalThrows"/>
Example:
public class Test { public void func1() throws RuntimeException {} // violation public void func2() throws Exception {} // ok public void func3() throws Error {} // violation public void func4() throws Throwable {} // violation public void func5() throws NullPointerException {} // ok @Override public void toString() throws Error {} // ok }
To configure the check rejecting throws NullPointerException from methods:
<module name="IllegalThrows"> <property name="illegalClassNames" value="NullPointerException"/> </module>
Example:
public class Test { public void func1() throws RuntimeException {} // ok public void func2() throws Exception {} // ok public void func3() throws Error {} // ok public void func4() throws Throwable {} // ok public void func5() throws NullPointerException {} // violation @Override public void toString() throws Error {} // ok }
To configure the check ignoring method named "func1()":
<module name="IllegalThrows"> <property name="ignoredMethodNames" value="func1"/> </module>
Example:
public class Test { public void func1() throws RuntimeException {} // ok public void func2() throws Exception {} // ok public void func3() throws Error {} // violation public void func4() throws Throwable {} // violation public void func5() throws NullPointerException {} // ok @Override public void toString() throws Error {} // ok }
To configure the check to warn on overridden methods:
<module name="IllegalThrows"> <property name="ignoreOverriddenMethods" value="false"/> </module>
Example:
public class Test { public void func1() throws RuntimeException {} // violation public void func2() throws Exception {} // ok public void func3() throws Error {} // violation public void func4() throws Throwable {} // violation public void func5() throws NullPointerException {} // ok @Override public void toString() throws Error {} // violation }
Parent is
com.puppycrawl.tools.checkstyle.TreeWalker
Violation Message Keys:
-
illegal.throw
- Since:
- 4.0
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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 private java.util.Set<java.lang.String>
ignoredMethodNames
Specify names of methods to ignore.private boolean
ignoreOverriddenMethods
Allow to ignore checking overridden methods (marked withOverride
orjava.lang.Override
annotation).private java.util.Set<java.lang.String>
illegalClassNames
Specify throw class names to reject.static java.lang.String
MSG_KEY
A key is pointing to the warning message text in "messages.properties" file.
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Constructor Summary
Constructors Constructor Description IllegalThrowsCheck()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.private boolean
isIgnorableMethod(DetailAST methodDef)
Checks if current method is ignorable due to Check's properties.void
setIgnoredMethodNames(java.lang.String... methodNames)
Setter to specify names of methods to ignore.void
setIgnoreOverriddenMethods(boolean ignoreOverriddenMethods)
Setter to allow to ignore checking overridden methods (marked withOverride
orjava.lang.Override
annotation).void
setIllegalClassNames(java.lang.String... classNames)
Setter to specify throw class names to reject.private boolean
shouldIgnoreMethod(java.lang.String name)
Check if the method is specified in the ignore method list.void
visitToken(DetailAST detailAST)
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
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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 java.lang.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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ignoredMethodNames
private final java.util.Set<java.lang.String> ignoredMethodNames
Specify names of methods to ignore.
-
illegalClassNames
private final java.util.Set<java.lang.String> illegalClassNames
Specify throw class names to reject.
-
ignoreOverriddenMethods
private boolean ignoreOverriddenMethods
Allow to ignore checking overridden methods (marked withOverride
orjava.lang.Override
annotation).
-
-
Constructor Detail
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IllegalThrowsCheck
public IllegalThrowsCheck()
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Method Detail
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setIllegalClassNames
public void setIllegalClassNames(java.lang.String... classNames)
Setter to specify throw class names to reject.- Parameters:
classNames
- array of illegal exception classes
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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
-
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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visitToken
public void visitToken(DetailAST detailAST)
Description copied from class:AbstractCheck
Called to process a token.- Overrides:
visitToken
in classAbstractCheck
- Parameters:
detailAST
- the token to process
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isIgnorableMethod
private boolean isIgnorableMethod(DetailAST methodDef)
Checks if current method is ignorable due to Check's properties.- Parameters:
methodDef
-METHOD_DEF
- Returns:
- true if method is ignorable.
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shouldIgnoreMethod
private boolean shouldIgnoreMethod(java.lang.String name)
Check if the method is specified in the ignore method list.- Parameters:
name
- the name to check- Returns:
- whether the method with the passed name should be ignored
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setIgnoredMethodNames
public void setIgnoredMethodNames(java.lang.String... methodNames)
Setter to specify names of methods to ignore.- Parameters:
methodNames
- array of ignored method names
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setIgnoreOverriddenMethods
public void setIgnoreOverriddenMethods(boolean ignoreOverriddenMethods)
Setter to allow to ignore checking overridden methods (marked withOverride
orjava.lang.Override
annotation).- Parameters:
ignoreOverriddenMethods
- Check's property.
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