Class SuppressionCommentFilter
- java.lang.Object
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- com.puppycrawl.tools.checkstyle.api.AutomaticBean
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- com.puppycrawl.tools.checkstyle.filters.SuppressionCommentFilter
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- All Implemented Interfaces:
Configurable
,Contextualizable
,TreeWalkerFilter
public class SuppressionCommentFilter extends AutomaticBean implements TreeWalkerFilter
Filter
SuppressionCommentFilter
uses pairs of comments to suppress audit events.Rationale: Sometimes there are legitimate reasons for violating a check. When this is a matter of the code in question and not personal preference, the best place to override the policy is in the code itself. Semi-structured comments can be associated with the check. This is sometimes superior to a separate suppressions file, which must be kept up-to-date as the source file is edited.
Note that the suppression comment should be put before the violation. You can use more than one suppression comment each on separate line.
Attention: This filter may only be specified within the TreeWalker module (
<module name="TreeWalker"/>
) and only applies to checks which are also defined within this module. To filter non-TreeWalker checks likeRegexpSingleline
, a SuppressWithPlainTextCommentFilter or similar filter must be used.offCommentFormat
andonCommentFormat
must have equal paren counts.SuppressionCommentFilter can suppress Checks that have Treewalker as parent module.
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Property
offCommentFormat
- Specify comment pattern to trigger filter to begin suppression. Type isjava.util.regex.Pattern
. Default value is"CHECKSTYLE:OFF"
. -
Property
onCommentFormat
- Specify comment pattern to trigger filter to end suppression. Type isjava.util.regex.Pattern
. Default value is"CHECKSTYLE:ON"
. -
Property
checkFormat
- Specify check pattern to suppress. Type isjava.lang.String
. Default value is".*"
. -
Property
messageFormat
- Specify message pattern to suppress. Type isjava.lang.String
. Default value isnull
. -
Property
idFormat
- Specify check ID pattern to suppress. Type isjava.lang.String
. Default value isnull
. -
Property
checkCPP
- Control whether to check C++ style comments (//
). Type isboolean
. Default value istrue
. -
Property
checkC
- Control whether to check C style comments (/* ... */
). Type isboolean
. Default value istrue
.
To configure a filter to suppress audit events between a comment containing
CHECKSTYLE:OFF
and a comment containingCHECKSTYLE:ON
:<module name="TreeWalker"> ... <module name="SuppressionCommentFilter"/> ... </module>
To configure a filter to suppress audit events between a comment containing line
BEGIN GENERATED CODE
and a comment containing lineEND GENERATED CODE
:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="BEGIN GENERATED CODE"/> <property name="onCommentFormat" value="END GENERATED CODE"/> </module>
//BEGIN GENERATED CODE @Override public boolean equals(Object obj) { ... } // No violation events will be reported @Override public int hashCode() { ... } // No violation events will be reported //END GENERATED CODE . . .
To configure a filter so that
// stop constant check
and// resume constant check
marks legitimate constant names:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="stop constant check"/> <property name="onCommentFormat" value="resume constant check"/> <property name="checkFormat" value="ConstantNameCheck"/> </module>
//stop constant check public static final int someConstant; // won't warn here //resume constant check public static final int someConstant; // will warn here as constant's name doesn't match the // pattern "^[A-Z][A-Z0-9]*$"
To configure a filter so that
UNUSED OFF: <i>var</i>
andUNUSED ON: <i>var</i>
marks a variable or parameter known not to be used by the code by matching the variable name in the message:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="UNUSED OFF\: (\w+)"/> <property name="onCommentFormat" value="UNUSED ON\: (\w+)"/> <property name="checkFormat" value="Unused"/> <property name="messageFormat" value="^Unused \w+ '$1'.$"/> </module>
private static void foo(int a, int b) // UNUSED OFF: b { System.out.println(a); } private static void foo1(int a, int b) // UNUSED ON: b { System.out.println(a); }
To configure a filter so that name of suppressed check mentioned in comment
CSOFF: <i>regexp</i>
andCSON: <i>regexp</i>
mark a matching check:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="CSOFF\: ([\w\|]+)"/> <property name="onCommentFormat" value="CSON\: ([\w\|]+)"/> <property name="checkFormat" value="$1"/> </module>
public static final int lowerCaseConstant; // CSOFF: ConstantNameCheck public static final int lowerCaseConstant1; // CSON: ConstantNameCheck
To configure a filter to suppress all audit events between a comment containing
CHECKSTYLE_OFF: ALMOST_ALL
and a comment containingCHECKSTYLE_OFF: ALMOST_ALL
except for the EqualsHashCode check:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="CHECKSTYLE_OFF: ALMOST_ALL"/> <property name="onCommentFormat" value="CHECKSTYLE_ON: ALMOST_ALL"/> <property name="checkFormat" value="^((?!(EqualsHashCode)).)*$"/> </module>
public static final int array []; // CHECKSTYLE_OFF: ALMOST_ALL private String [] strArray; private int array1 []; // CHECKSTYLE_ON: ALMOST_ALL
To configure a filter to suppress Check's violation message which matches specified message in messageFormat (so suppression will be not only by Check's name, but by message text additionally, as the same Check could report different by message format violations) between a comment containing
stop
and comment containingresume
:<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="stop"/> <property name="onCommentFormat" value="resume"/> <property name="checkFormat" value="IllegalTypeCheck"/> <property name="messageFormat" value="^Declaring variables, return values or parameters of type 'GregorianCalendar' is not allowed.$"/> </module>
Code before filter above is applied with Check's audit events:
... // Warning below: Declaring variables, return values or parameters of type 'GregorianCalendar' // is not allowed. GregorianCalendar calendar; // Warning below here: Declaring variables, return values or parameters of type 'HashSet' // is not allowed. HashSet hashSet; ...
Code after filter is applied:
... //stop GregorianCalendar calendar; // No warning here as it is suppressed by filter. HashSet hashSet; // Warning above here: Declaring variables, return values or parameters of type 'HashSet' //is not allowed. //resume ...
It is possible to specify an ID of checks, so that it can be leveraged by the SuppressionCommentFilter to skip validations. The following examples show how to skip validations near code that is surrounded with
// CSOFF <ID> (reason)
and// CSON <ID>
, where ID is the ID of checks you want to suppress.Examples of Checkstyle checks configuration:
<module name="RegexpSinglelineJava"> <property name="id" value="ignore"/> <property name="format" value="^.*@Ignore\s*$"/> <property name="message" value="@Ignore should have a reason."/> </module> <module name="RegexpSinglelineJava"> <property name="id" value="systemout"/> <property name="format" value="^.*System\.(out|err).*$"/> <property name="message" value="Don't use System.out/err, use SLF4J instead."/> </module>
Example of SuppressionCommentFilter configuration (checkFormat which is set to '$1' points that ID of the checks is in the first group of offCommentFormat and onCommentFormat regular expressions):
<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="CSOFF (\w+) \(\w+\)"/> <property name="onCommentFormat" value="CSON (\w+)"/> <property name="idFormat" value="$1"/> </module>
// CSOFF ignore (test has not been implemented yet) @Ignore // should NOT fail RegexpSinglelineJava @Test public void testMethod() { } // CSON ignore // CSOFF systemout (debug) public static void foo() { System.out.println("Debug info."); // should NOT fail RegexpSinglelineJava } // CSON systemout
Example of how to configure the check to suppress more than one checks.
<module name="SuppressionCommentFilter"> <property name="offCommentFormat" value="@cs-\: ([\w\|]+)"/> <property name="checkFormat" value="$1"/> </module>
// @cs-: ClassDataAbstractionCoupling // @cs-: MagicNumber @Service // no violations from ClassDataAbstractionCoupling here @Transactional public class UserService { private int value = 10022; // no violations from MagicNumber here }
Parent is
com.puppycrawl.tools.checkstyle.TreeWalker
- Since:
- 3.5
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
SuppressionCommentFilter.TagType
Enum to be used for switching checkstyle reporting for tags.-
Nested classes/interfaces inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean
AutomaticBean.OutputStreamOptions
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Constructor Summary
Constructors Constructor Description SuppressionCommentFilter()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
accept(TreeWalkerAuditEvent event)
Determines whether or not a filteredTreeWalkerAuditEvent
is accepted.protected void
finishLocalSetup()
Provides a hook to finish the part of this component's setup that was not handled by the bean introspection.void
setCheckC(boolean checkC)
Setter to control whether to check C style comments (/* ... */
).void
setCheckCPP(boolean checkCpp)
Setter to control whether to check C++ style comments (//
).void
setCheckFormat(java.lang.String format)
Setter to specify check pattern to suppress.void
setFileContents(FileContents fileContents)
Set the FileContents for this filter.void
setIdFormat(java.lang.String format)
Setter to specify check ID pattern to suppress.void
setMessageFormat(java.lang.String format)
Setter to specify message pattern to suppress.void
setOffCommentFormat(java.util.regex.Pattern pattern)
Setter to specify comment pattern to trigger filter to begin suppression.void
setOnCommentFormat(java.util.regex.Pattern pattern)
Setter to specify comment pattern to trigger filter to end suppression.-
Methods inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean
configure, contextualize, getConfiguration, setupChild
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Method Detail
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setOffCommentFormat
public final void setOffCommentFormat(java.util.regex.Pattern pattern)
Setter to specify comment pattern to trigger filter to begin suppression.- Parameters:
pattern
- a pattern.
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setOnCommentFormat
public final void setOnCommentFormat(java.util.regex.Pattern pattern)
Setter to specify comment pattern to trigger filter to end suppression.- Parameters:
pattern
- a pattern.
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setFileContents
public void setFileContents(FileContents fileContents)
Set the FileContents for this filter.- Parameters:
fileContents
- the FileContents for this filter.
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setCheckFormat
public final void setCheckFormat(java.lang.String format)
Setter to specify check pattern to suppress.- Parameters:
format
- aString
value
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setMessageFormat
public void setMessageFormat(java.lang.String format)
Setter to specify message pattern to suppress.- Parameters:
format
- aString
value
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setIdFormat
public void setIdFormat(java.lang.String format)
Setter to specify check ID pattern to suppress.- Parameters:
format
- aString
value
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setCheckCPP
public void setCheckCPP(boolean checkCpp)
Setter to control whether to check C++ style comments (//
).- Parameters:
checkCpp
-true
if C++ comments are checked.
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setCheckC
public void setCheckC(boolean checkC)
Setter to control whether to check C style comments (/* ... */
).- Parameters:
checkC
-true
if C comments are checked.
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finishLocalSetup
protected void finishLocalSetup()
Description copied from class:AutomaticBean
Provides a hook to finish the part of this component's setup that was not handled by the bean introspection.The default implementation does nothing.
- Specified by:
finishLocalSetup
in classAutomaticBean
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accept
public boolean accept(TreeWalkerAuditEvent event)
Description copied from interface:TreeWalkerFilter
Determines whether or not a filteredTreeWalkerAuditEvent
is accepted.- Specified by:
accept
in interfaceTreeWalkerFilter
- Parameters:
event
- the TreeWalkerAuditEvent to filter.- Returns:
- true if the event is accepted.
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