com.puppycrawl.tools.checkstyle.checks.design

Class VisibilityModifierCheck

java.lang.Object

com.puppycrawl.tools.checkstyle.api.AutomaticBean

com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter

com.puppycrawl.tools.checkstyle.api.AbstractCheck

com.puppycrawl.tools.checkstyle.checks.design.VisibilityModifierCheck

All Implemented Interfaces:

Configurable, Contextualizable

public class VisibilityModifierCheck
extends AbstractCheck

Checks visibility of class members. Only static final, immutable or annotated by specified annotation members may be public; other class members must be private unless the property protectedAllowed or packageAllowed is set.

Public members are not flagged if the name matches the public member regular expression (contains "^serialVersionUID$" by default).

Note that Checkstyle 2 used to include "^f[A-Z][a-zA-Z0-9]*$" in the default pattern to allow names used in container-managed persistence for Enterprise JavaBeans (EJB) 1.1 with the default settings. With EJB 2.0 it is no longer necessary to have public access for persistent fields, so the default has been changed.

Rationale: Enforce encapsulation.

Check also has options making it less strict:

ignoreAnnotationCanonicalNames- the list of annotations which ignore variables in consideration. If user will provide short annotation name that type will match to any named the same type without consideration of package.

allowPublicFinalFields- which allows public final fields.

allowPublicImmutableFields- which allows immutable fields to be declared as public if defined in final class.

Field is known to be immutable if:

• It's declared as final
• Has either a primitive type or instance of class user defined to be immutable (such as String, ImmutableCollection from Guava and etc)

Classes known to be immutable are listed in immutableClassCanonicalNames by their canonical names.

Property Rationale: Forcing all fields of class to have private modifier by default is good in most cases, but in some cases it drawbacks in too much boilerplate get/set code. One of such cases are immutable classes.

Restriction: Check doesn't check if class is immutable, there's no checking if accessory methods are missing and all fields are immutable, we only check if current field is immutable or final. Under the flag allowPublicImmutableFields, the enclosing class must also be final, to encourage immutability. Under the flag allowPublicFinalFields, the final modifier on the enclosing class is optional.

Star imports are out of scope of this Check. So if one of type imported via star import collides with user specified one by its short name - there won't be Check's violation.

• Property packageAllowed - Control whether package visible members are allowed. Type is boolean. Default value is false.
• Property protectedAllowed - Control whether protected members are allowed. Type is boolean. Default value is false.
• Property publicMemberPattern - Specify pattern for public members that should be ignored. Type is java.util.regex.Pattern. Default value is "^serialVersionUID$".
• Property allowPublicFinalFields - Allow final fields to be declared as public. Type is boolean. Default value is false.
• Property allowPublicImmutableFields - Allow immutable fields to be declared as public if defined in final class. Type is boolean. Default value is false.
• Property immutableClassCanonicalNames - Specify immutable classes canonical names. Type is java.lang.String[]. Default value is java.io.File, java.lang.Boolean, java.lang.Byte, java.lang.Character, java.lang.Double, java.lang.Float, java.lang.Integer, java.lang.Long, java.lang.Short, java.lang.StackTraceElement, java.lang.String, java.math.BigDecimal, java.math.BigInteger, java.net.Inet4Address, java.net.Inet6Address, java.net.InetSocketAddress, java.net.URI, java.net.URL, java.util.Locale, java.util.UUID.
• Property ignoreAnnotationCanonicalNames - Specify the list of annotations canonical names which ignore variables in consideration. Type is java.lang.String[]. Default value is com.google.common.annotations.VisibleForTesting, org.junit.ClassRule, org.junit.Rule.

To configure the check:

 <module name="VisibilityModifier"/>
 

To configure the check so that it allows package visible members:

 <module name="VisibilityModifier">
   <property name="packageAllowed" value="true"/>
 </module>
 

To configure the check so that it allows no public members:

 <module name="VisibilityModifier">
   <property name="publicMemberPattern" value="^$"/>
 </module>
 

To configure the Check so that it allows public immutable fields (mostly for immutable classes):

 <module name="VisibilityModifier">
   <property name="allowPublicImmutableFields" value="true"/>
 </module>
 

Example of allowed public immutable fields:

 public class ImmutableClass
 {
   public final ImmutableSet<String> includes; // No warning
   public final ImmutableSet<String> excludes; // No warning
   public final java.lang.String notes; // No warning
   public final BigDecimal value; // No warning

   public ImmutableClass(Collection<String> includes, Collection<String> excludes,
                BigDecimal value, String notes)
   {
     this.includes = ImmutableSet.copyOf(includes);
     this.excludes = ImmutableSet.copyOf(excludes);
     this.value = value;
     this.notes = notes;
   }
 }
 

To configure the Check in order to allow user specified immutable class names:

 <module name="VisibilityModifier">
   <property name="allowPublicImmutableFields" value="true"/>
   <property name="immutableClassCanonicalNames" value="
   com.google.common.collect.ImmutableSet"/>
 </module>
 

Example of allowed public immutable fields:

 public class ImmutableClass
 {
   public final ImmutableSet<String> includes; // No warning
   public final ImmutableSet<String> excludes; // No warning
   public final java.lang.String notes; // Warning here because
                                        //'java.lang.String' wasn't specified as allowed class
   public final int someValue; // No warning

   public ImmutableClass(Collection<String> includes, Collection<String> excludes,
                String notes, int someValue)
   {
     this.includes = ImmutableSet.copyOf(includes);
     this.excludes = ImmutableSet.copyOf(excludes);
     this.value = value;
     this.notes = notes;
     this.someValue = someValue;
   }
 }
 

Note, if allowPublicImmutableFields is set to true, the check will also check whether generic type parameters are immutable. If at least one generic type parameter is mutable, there will be a violation.

 <module name="VisibilityModifier">
   <property name="allowPublicImmutableFields" value="true"/>
   <property name="immutableClassCanonicalNames"
     value="com.google.common.collect.ImmutableSet, com.google.common.collect.ImmutableMap,
       java.lang.String"/>
 </module>
 

Example of how the check works:

 public final class Test {
   public final String s;
   public final ImmutableSet<String> names;
   public final ImmutableSet<Object> objects; // violation (Object class is mutable)
   public final ImmutableMap<String, Object> links; // violation (Object class is mutable)

   public Test() {
     s = "Hello!";
     names = ImmutableSet.of();
     objects = ImmutableSet.of();
     links = ImmutableMap.of();
   }
 }
 

To configure the Check passing fields annotated with @com.annotation.CustomAnnotation:

 <module name="VisibilityModifier">
   <property name="ignoreAnnotationCanonicalNames" value=
   "com.annotation.CustomAnnotation"/>
 </module>
 

Example of allowed field:

 class SomeClass
 {
   @com.annotation.CustomAnnotation
   String annotatedString; // no warning
   @CustomAnnotation
   String shortCustomAnnotated; // no warning
 }
 

To configure the Check passing fields annotated with @org.junit.Rule, @org.junit.ClassRule and @com.google.common.annotations.VisibleForTesting annotations:

 <module name="VisibilityModifier"/>
 

Example of allowed fields:

 class SomeClass
 {
   @org.junit.Rule
   public TemporaryFolder publicJUnitRule = new TemporaryFolder(); // no warning
   @org.junit.ClassRule
   public static TemporaryFolder publicJUnitClassRule = new TemporaryFolder(); // no warning
   @com.google.common.annotations.VisibleForTesting
   public String testString = ""; // no warning
 }
 

To configure the Check passing fields annotated with short annotation name:

 <module name="VisibilityModifier">
   <property name="ignoreAnnotationCanonicalNames"
   value="CustomAnnotation"/>
 </module>
 

Example of allowed fields:

 class SomeClass
 {
   @CustomAnnotation
   String customAnnotated; // no warning
   @com.annotation.CustomAnnotation
   String customAnnotated1; // no warning
   @mypackage.annotation.CustomAnnotation
   String customAnnotatedAnotherPackage; // another package but short name matches
                                         // so no violation
 }
 

To understand the difference between allowPublicImmutableFields and allowPublicFinalFields options, please, study the following examples.

1) To configure the check to use only 'allowPublicImmutableFields' option:

 <module name="VisibilityModifier">
   <property name="allowPublicImmutableFields" value="true"/>
 </module>
 

Code example:

 public class InputPublicImmutable {
   public final int someIntValue; // violation
   public final ImmutableSet<String> includes; // violation
   public final java.lang.String notes; // violation
   public final BigDecimal value; // violation
   public final List list; // violation

   public InputPublicImmutable(Collection<String> includes,
         BigDecimal value, String notes, int someValue, List l) {
     this.includes = ImmutableSet.copyOf(includes);
     this.value = value;
     this.notes = notes;
     this.someIntValue = someValue;
     this.list = l;
   }
 }
 

2) To configure the check to use only 'allowPublicFinalFields' option:

 <module name="VisibilityModifier">
   <property name="allowPublicFinalFields" value="true"/>
 </module>
 

Code example:

 public class InputPublicImmutable {
   public final int someIntValue;
   public final ImmutableSet<String> includes;
   public final java.lang.String notes;
   public final BigDecimal value;
   public final List list;

   public InputPublicImmutable(Collection<String> includes,
         BigDecimal value, String notes, int someValue, List l) {
     this.includes = ImmutableSet.copyOf(includes);
     this.value = value;
     this.notes = notes;
     this.someIntValue = someValue;
     this.list = l;
   }
 }
 

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

• variable.notPrivate

Since:

3.0

Nested Class Summary

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

AutomaticBean.OutputStreamOptions

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	allowPublicFinalFields Allow final fields to be declared as public.
private boolean	allowPublicImmutableFields Allow immutable fields to be declared as public if defined in final class.
private static java.util.List<java.lang.String>	DEFAULT_IGNORE_ANNOTATIONS Default ignore annotations canonical names.
private static java.util.List<java.lang.String>	DEFAULT_IMMUTABLE_TYPES Default immutable types canonical names.
private static java.lang.String[]	EXPLICIT_MODS Contains explicit access modifiers.
private static java.lang.String	FINAL_KEYWORD Name for 'final' keyword.
private java.util.List<java.lang.String>	ignoreAnnotationCanonicalNames Specify the list of annotations canonical names which ignore variables in consideration.
private java.util.List<java.lang.String>	ignoreAnnotationShortNames List of ignore annotations short names.
private java.util.List<java.lang.String>	immutableClassCanonicalNames Specify immutable classes canonical names.
private java.util.List<java.lang.String>	immutableClassShortNames List of immutable classes short names.
static java.lang.String	MSG_KEY A key is pointing to the warning message text in "messages.properties" file.
private static java.lang.String	PACKAGE_ACCESS_MODIFIER Name for implicit 'package' access modifier.
private boolean	packageAllowed Control whether package visible members are allowed.
private static java.lang.String	PRIVATE_ACCESS_MODIFIER Name for 'private' access modifier.
private static java.lang.String	PROTECTED_ACCESS_MODIFIER Name for 'protected' access modifier.
private boolean	protectedAllowed Control whether protected members are allowed.
private static java.lang.String	PUBLIC_ACCESS_MODIFIER Name for 'public' access modifier.
private java.util.regex.Pattern	publicMemberPattern Specify pattern for public members that should be ignored.
private static java.lang.String	STATIC_KEYWORD Name for 'static' keyword.

Constructor Summary

Constructors

Constructor and Description
VisibilityModifierCheck()

Method Summary

Modifier and Type	Method and Description
private boolean	areImmutableTypeArguments(java.util.List<java.lang.String> typeArgsClassNames) Checks whether all of generic type arguments are immutable.
void	beginTree(DetailAST rootAst) Called before the starting to process a tree.
private DetailAST	findMatchingAnnotation(DetailAST variableDef) Checks whether the AST is annotated with an annotation containing the passed in regular expression and return the AST representing that annotation.
int[]	getAcceptableTokens() The configurable token set.
private static java.lang.String	getCanonicalName(DetailAST type) Gets canonical type's name from given TYPE node.
private static java.lang.String	getClassShortName(java.lang.String canonicalClassName) Gets the short class name from given canonical name.
private static java.util.List<java.lang.String>	getClassShortNames(java.util.List<java.lang.String> canonicalClassNames) Gets the list with short names classes.
int[]	getDefaultTokens() Returns the default token a check is interested in.
private static DetailAST	getGenericTypeArgs(DetailAST type, boolean isCanonicalName) Returns generic type arguments token.
private static java.util.Set<java.lang.String>	getModifiers(DetailAST defAST) Returns the set of modifier Strings for a VARIABLE_DEF or CLASS_DEF AST.
private static DetailAST	getNextSubTreeNode(DetailAST currentNodeAst, DetailAST subTreeRootAst) Gets the next node of a syntactical tree (child of a current node or sibling of a current node, or sibling of a parent of a current node).
int[]	getRequiredTokens() The tokens that this check must be registered for.
private static java.util.List<java.lang.String>	getTypeArgsClassNames(DetailAST typeArgs) Returns a list of type parameters class names.
private static java.lang.String	getTypeName(DetailAST type, boolean isCanonicalName) Gets the name of type from given ast TYPE node.
private static java.lang.String	getVisibilityScope(DetailAST variableDef) Returns the visibility scope for the variable.
private boolean	hasIgnoreAnnotation(DetailAST variableDef) Checks if variable def has ignore annotation.
private boolean	hasProperAccessModifier(DetailAST variableDef, java.lang.String variableName) Checks if current variable has proper access modifier according to Check's options.
private boolean	isAllowedPublicField(DetailAST variableDef) Checks whether the variable satisfies the public field check.
private static boolean	isAnonymousClassVariable(DetailAST variableDef) Checks if current variable definition is definition of an anonymous class.
private static boolean	isCanonicalName(DetailAST type) Checks whether type definition is in canonical form.
private static boolean	isFinalField(DetailAST variableDef) Checks whether current field is final.
private boolean	isIgnoredPublicMember(java.lang.String variableName, java.lang.String variableScope) Checks whether variable belongs to public members that should be ignored.
private boolean	isImmutableField(DetailAST variableDef) Checks if current field is immutable: has final modifier and either a primitive type or instance of class known to be immutable (such as String, ImmutableCollection from Guava and etc).
private boolean	isImmutableFieldDefinedInFinalClass(DetailAST variableDef) Checks whether immutable field is defined in final class.
private static boolean	isPrimitive(DetailAST type) Checks if current type is primitive type (int, short, float, boolean, double, etc.).
private static boolean	isStarImport(DetailAST importAst) Checks if current import is star import.
private static boolean	isStaticFinalVariable(DetailAST variableDef) Checks whether variable has static final modifiers.
void	setAllowPublicFinalFields(boolean allow) Setter to allow final fields to be declared as public.
void	setAllowPublicImmutableFields(boolean allow) Setter to allow immutable fields to be declared as public if defined in final class.
void	setIgnoreAnnotationCanonicalNames(java.lang.String... annotationNames) Setter to specify the list of annotations canonical names which ignore variables in consideration.
void	setImmutableClassCanonicalNames(java.lang.String... classNames) Setter to specify immutable classes canonical names.
void	setPackageAllowed(boolean packageAllowed) Setter to control whether package visible members are allowed.
void	setProtectedAllowed(boolean protectedAllowed) Setter to control whether protected members are allowed.
void	setPublicMemberPattern(java.util.regex.Pattern pattern) Setter to specify pattern for public members that should be ignored.
private void	visitImport(DetailAST importAst) Checks imported type.
void	visitToken(DetailAST ast) Called to process a token.
private void	visitVariableDef(DetailAST variableDef) Checks access modifier of given variable.

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

clearViolations, destroy, finishTree, getFileContents, 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.api.AutomaticBean

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_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

DEFAULT_IMMUTABLE_TYPES

private static final java.util.List<java.lang.String> DEFAULT_IMMUTABLE_TYPES

Default immutable types canonical names.

DEFAULT_IGNORE_ANNOTATIONS

private static final java.util.List<java.lang.String> DEFAULT_IGNORE_ANNOTATIONS

Default ignore annotations canonical names.

PUBLIC_ACCESS_MODIFIER

private static final java.lang.String PUBLIC_ACCESS_MODIFIER

Name for 'public' access modifier.

See Also:

Constant Field Values

PRIVATE_ACCESS_MODIFIER

private static final java.lang.String PRIVATE_ACCESS_MODIFIER

Name for 'private' access modifier.

See Also:

Constant Field Values

PROTECTED_ACCESS_MODIFIER

private static final java.lang.String PROTECTED_ACCESS_MODIFIER

Name for 'protected' access modifier.

See Also:

Constant Field Values

PACKAGE_ACCESS_MODIFIER

private static final java.lang.String PACKAGE_ACCESS_MODIFIER

Name for implicit 'package' access modifier.

See Also:

Constant Field Values

STATIC_KEYWORD

private static final java.lang.String STATIC_KEYWORD

Name for 'static' keyword.

See Also:

Constant Field Values

FINAL_KEYWORD

private static final java.lang.String FINAL_KEYWORD

Name for 'final' keyword.

See Also:

Constant Field Values

EXPLICIT_MODS

private static final java.lang.String[] EXPLICIT_MODS

Contains explicit access modifiers.

publicMemberPattern

private java.util.regex.Pattern publicMemberPattern

Specify pattern for public members that should be ignored.

ignoreAnnotationShortNames

private final java.util.List<java.lang.String> ignoreAnnotationShortNames

List of ignore annotations short names.

immutableClassShortNames

private final java.util.List<java.lang.String> immutableClassShortNames

List of immutable classes short names.

ignoreAnnotationCanonicalNames

private java.util.List<java.lang.String> ignoreAnnotationCanonicalNames

Specify the list of annotations canonical names which ignore variables in consideration.

protectedAllowed

private boolean protectedAllowed

Control whether protected members are allowed.

packageAllowed

private boolean packageAllowed

Control whether package visible members are allowed.

allowPublicImmutableFields

private boolean allowPublicImmutableFields

Allow immutable fields to be declared as public if defined in final class.

allowPublicFinalFields

private boolean allowPublicFinalFields

Allow final fields to be declared as public.

immutableClassCanonicalNames

private java.util.List<java.lang.String> immutableClassCanonicalNames

Specify immutable classes canonical names.

Constructor Detail

VisibilityModifierCheck

public VisibilityModifierCheck()

Method Detail

setIgnoreAnnotationCanonicalNames

public void setIgnoreAnnotationCanonicalNames(java.lang.String... annotationNames)

Setter to specify the list of annotations canonical names which ignore variables in consideration.

Parameters:

annotationNames - array of ignore annotations canonical names.

setProtectedAllowed

public void setProtectedAllowed(boolean protectedAllowed)

Setter to control whether protected members are allowed.

Parameters:

protectedAllowed - whether protected members are allowed

setPackageAllowed

public void setPackageAllowed(boolean packageAllowed)

Setter to control whether package visible members are allowed.

Parameters:

packageAllowed - whether package visible members are allowed

setPublicMemberPattern

public void setPublicMemberPattern(java.util.regex.Pattern pattern)

Setter to specify pattern for public members that should be ignored.

Parameters:

pattern - pattern for public members to ignore.

setAllowPublicImmutableFields

public void setAllowPublicImmutableFields(boolean allow)

Setter to allow immutable fields to be declared as public if defined in final class.

Parameters:

allow - user's value.

setAllowPublicFinalFields

public void setAllowPublicFinalFields(boolean allow)

Setter to allow final fields to be declared as public.

Parameters:

allow - user's value.

setImmutableClassCanonicalNames

public void setImmutableClassCanonicalNames(java.lang.String... classNames)

Setter to specify immutable classes canonical names.

Parameters:

classNames - array of immutable types canonical names.

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

beginTree

public void beginTree(DetailAST rootAst)

Description copied from class: AbstractCheck

Called before the starting to process a tree. Ideal place to initialize information that is to be collected whilst processing a tree.

Overrides:

beginTree in class AbstractCheck

Parameters:

rootAst - the root of the tree

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

isAnonymousClassVariable

private static boolean isAnonymousClassVariable(DetailAST variableDef)

Checks if current variable definition is definition of an anonymous class.

Parameters:

variableDef - VARIABLE_DEF

Returns:

true if current variable definition is definition of an anonymous class.

visitVariableDef

private void visitVariableDef(DetailAST variableDef)

Checks access modifier of given variable. If it is not proper according to Check - puts violation on it.

Parameters:

variableDef - variable to check.

hasIgnoreAnnotation

private boolean hasIgnoreAnnotation(DetailAST variableDef)

Checks if variable def has ignore annotation.

Parameters:

variableDef - VARIABLE_DEF

Returns:

true if variable def has ignore annotation.

visitImport

private void visitImport(DetailAST importAst)

Checks imported type. If type's canonical name was not specified in immutableClassCanonicalNames, but it's short name collides with one from immutableClassShortNames - removes it from the last one.

Parameters:

importAst - Import

isStarImport

private static boolean isStarImport(DetailAST importAst)

Checks if current import is star import. E.g.:

import java.util.*;

Parameters:

importAst - Import

Returns:

true if it is star import

hasProperAccessModifier

private boolean hasProperAccessModifier(DetailAST variableDef,
                                        java.lang.String variableName)

Checks if current variable has proper access modifier according to Check's options.

Parameters:

variableDef - Variable definition node.

variableName - Variable's name.

Returns:

true if variable has proper access modifier.

isStaticFinalVariable

private static boolean isStaticFinalVariable(DetailAST variableDef)

Checks whether variable has static final modifiers.

Parameters:

variableDef - Variable definition node.

Returns:

true of variable has static final modifiers.

isIgnoredPublicMember

private boolean isIgnoredPublicMember(java.lang.String variableName,
                                      java.lang.String variableScope)

Checks whether variable belongs to public members that should be ignored.

Parameters:

variableName - Variable's name.

variableScope - Variable's scope.

Returns:

true if variable belongs to public members that should be ignored.

isAllowedPublicField

private boolean isAllowedPublicField(DetailAST variableDef)

Checks whether the variable satisfies the public field check.

Parameters:

variableDef - Variable definition node.

Returns:

true if allowed.

isImmutableFieldDefinedInFinalClass

private boolean isImmutableFieldDefinedInFinalClass(DetailAST variableDef)

Checks whether immutable field is defined in final class.

Parameters:

variableDef - Variable definition node.

Returns:

true if immutable field is defined in final class.

getModifiers

private static java.util.Set<java.lang.String> getModifiers(DetailAST defAST)

Returns the set of modifier Strings for a VARIABLE_DEF or CLASS_DEF AST.

Parameters:

defAST - AST for a variable or class definition.

Returns:

the set of modifier Strings for defAST.

getVisibilityScope

private static java.lang.String getVisibilityScope(DetailAST variableDef)

Returns the visibility scope for the variable.

Parameters:

variableDef - Variable definition node.

Returns:

one of "public", "private", "protected", "package"

isImmutableField

private boolean isImmutableField(DetailAST variableDef)

Checks if current field is immutable: has final modifier and either a primitive type or instance of class known to be immutable (such as String, ImmutableCollection from Guava and etc). Classes known to be immutable are listed in immutableClassCanonicalNames

Parameters:

variableDef - Field in consideration.

Returns:

true if field is immutable.

isCanonicalName

private static boolean isCanonicalName(DetailAST type)

Checks whether type definition is in canonical form.

Parameters:

type - type definition token.

Returns:

true if type definition is in canonical form.

getGenericTypeArgs

private static DetailAST getGenericTypeArgs(DetailAST type,
                                            boolean isCanonicalName)

Returns generic type arguments token.

Parameters:

type - type token.

isCanonicalName - whether type name is in canonical form.

Returns:

generic type arguments token.

getTypeArgsClassNames

private static java.util.List<java.lang.String> getTypeArgsClassNames(DetailAST typeArgs)

Returns a list of type parameters class names.

Parameters:

typeArgs - type arguments token.

Returns:

a list of type parameters class names.

areImmutableTypeArguments

private boolean areImmutableTypeArguments(java.util.List<java.lang.String> typeArgsClassNames)

Checks whether all of generic type arguments are immutable. If at least one argument is mutable, we assume that the whole list of type arguments is mutable.

Parameters:

typeArgsClassNames - type arguments class names.

Returns:

true if all of generic type arguments are immutable.

isFinalField

private static boolean isFinalField(DetailAST variableDef)

Checks whether current field is final.

Parameters:

variableDef - field in consideration.

Returns:

true if current field is final.

getTypeName

private static java.lang.String getTypeName(DetailAST type,
                                            boolean isCanonicalName)

Gets the name of type from given ast TYPE node. If type is specified via its canonical name - canonical name will be returned, else - short type's name.

Parameters:

type - TYPE node.

isCanonicalName - is given name canonical.

Returns:

String representation of given type's name.

isPrimitive

private static boolean isPrimitive(DetailAST type)

Checks if current type is primitive type (int, short, float, boolean, double, etc.). As primitive types have special tokens for each one, such as: LITERAL_INT, LITERAL_BOOLEAN, etc. So, if type's identifier differs from IDENT token - it's a primitive type.

Parameters:

type - Ast TYPE node.

Returns:

true if current type is primitive type.

getCanonicalName

private static java.lang.String getCanonicalName(DetailAST type)

Gets canonical type's name from given TYPE node.

Parameters:

type - DetailAST TYPE node.

Returns:

canonical type's name

getNextSubTreeNode

private static DetailAST getNextSubTreeNode(DetailAST currentNodeAst,
                                            DetailAST subTreeRootAst)

Gets the next node of a syntactical tree (child of a current node or sibling of a current node, or sibling of a parent of a current node).

Parameters:

currentNodeAst - Current node in considering

subTreeRootAst - SubTree root

Returns:

Current node after bypassing, if current node reached the root of a subtree method returns null

getClassShortNames

private static java.util.List<java.lang.String> getClassShortNames(java.util.List<java.lang.String> canonicalClassNames)

Gets the list with short names classes. These names are taken from array of classes canonical names.

Parameters:

canonicalClassNames - canonical class names.

Returns:

the list of short names of classes.

getClassShortName

private static java.lang.String getClassShortName(java.lang.String canonicalClassName)

Gets the short class name from given canonical name.

Parameters:

canonicalClassName - canonical class name.

Returns:

short name of class.

findMatchingAnnotation

private DetailAST findMatchingAnnotation(DetailAST variableDef)

Checks whether the AST is annotated with an annotation containing the passed in regular expression and return the AST representing that annotation.

This method will not look for imports or package statements to detect the passed in annotation.

To check if an AST contains a passed in annotation taking into account fully-qualified names (ex: java.lang.Override, Override) this method will need to be called twice. Once for each name given.

Parameters:

variableDef - variable def node.

Returns:

the AST representing the first such annotation or null if no such annotation was found