Class DefaultTypeCheckingExtension
- java.lang.Object
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- org.codehaus.groovy.transform.stc.TypeCheckingExtension
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- org.codehaus.groovy.transform.stc.DefaultTypeCheckingExtension
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public class DefaultTypeCheckingExtension extends TypeCheckingExtension
The default type checking handler is used by the standard type checker and doesn't handle any of the type checking errors by default. This just means that whenever a type checking error is detected, there's no additional information available to the type checker that could help it. The default handler is also capable of handling a collection of delegate handlers. If a list of delegates is set, then the type checker will try all the delegates until one is capable of handling an error.- Since:
- 2.1.0
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Field Summary
Fields Modifier and Type Field Description protected java.util.List<TypeCheckingExtension>handlers-
Fields inherited from class org.codehaus.groovy.transform.stc.TypeCheckingExtension
typeCheckingVisitor
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Constructor Summary
Constructors Constructor Description DefaultTypeCheckingExtension(StaticTypeCheckingVisitor typeCheckingVisitor)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidaddHandler(TypeCheckingExtension handler)voidafterMethodCall(MethodCall call)Allows the extension to perform additional tasks after the type checker actually visits a method call.voidafterVisitClass(ClassNode node)Allows the extension to perform additional tasks after the type checker actually visited a class node.voidafterVisitMethod(MethodNode node)Allows the extension to perform additional tasks after the type checker actually visited a method node.booleanbeforeMethodCall(MethodCall call)Allows the extension to perform additional tasks before the type checker actually visits a method call.booleanbeforeVisitClass(ClassNode node)Allows the extension to perform additional tasks before the type checker actually visits a class node.booleanbeforeVisitMethod(MethodNode node)Allows the extension to perform additional tasks before the type checker actually visits a method node.voidfinish()Subclasses should implement this method if they need to perform additional checks after the type checker has finished its work.java.util.List<MethodNode>handleAmbiguousMethods(java.util.List<MethodNode> nodes, Expression origin)This method is called by the type checker before throwing an "ambiguous method" error, giving the chance to the extension to select the method properly.booleanhandleIncompatibleAssignment(ClassNode lhsType, ClassNode rhsType, Expression assignmentExpression)This method is called by the type checker when an assignment is not allowed by the type checker.booleanhandleIncompatibleReturnType(ReturnStatement returnStatement, ClassNode inferredReturnType)Allows the extension to catch incompatible return types.java.util.List<MethodNode>handleMissingMethod(ClassNode receiver, java.lang.String name, ArgumentListExpression argumentList, ClassNode[] argumentTypes, MethodCall call)This method is called by the type checker when a method call cannot be resolved.booleanhandleUnresolvedAttribute(AttributeExpression aexp)This method is called by the type checker when an attribute expression cannot be resolved (for example, when an attribute doesn't exist).booleanhandleUnresolvedProperty(PropertyExpression pexp)This method is called by the type checker when a property expression cannot be resolved (for example, when a property doesn't exist).booleanhandleUnresolvedVariableExpression(VariableExpression vexp)This method is called by the type checker when a variable expression cannot be resolved.voidonMethodSelection(Expression expression, MethodNode target)Allows the extension to listen to method selection events.voidremoveHandler(TypeCheckingExtension handler)voidsetup()Subclasses should implement this method whenever they need to perform special checks before the type checker starts working.-
Methods inherited from class org.codehaus.groovy.transform.stc.TypeCheckingExtension
addStaticTypeError, buildListType, buildMapType, classNodeFor, classNodeFor, existsProperty, existsProperty, extractStaticReceiver, getArgumentTypes, getTargetMethod, getType, isStaticMethodCallOnClass, lookupClassNodeFor, parameterizedType, storeType
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Field Detail
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handlers
protected final java.util.List<TypeCheckingExtension> handlers
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Constructor Detail
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DefaultTypeCheckingExtension
public DefaultTypeCheckingExtension(StaticTypeCheckingVisitor typeCheckingVisitor)
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Method Detail
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addHandler
public void addHandler(TypeCheckingExtension handler)
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removeHandler
public void removeHandler(TypeCheckingExtension handler)
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handleUnresolvedVariableExpression
public boolean handleUnresolvedVariableExpression(VariableExpression vexp)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker when a variable expression cannot be resolved. It gives the extension a chance to resolve it for the type checker.- Overrides:
handleUnresolvedVariableExpressionin classTypeCheckingExtension- Parameters:
vexp- the unresolved variable extension- Returns:
booleanfalse if the extension doesn't handle it, true if the extension handles this variable.
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handleUnresolvedProperty
public boolean handleUnresolvedProperty(PropertyExpression pexp)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker when a property expression cannot be resolved (for example, when a property doesn't exist). It gives the extension a chance to resolve it.- Overrides:
handleUnresolvedPropertyin classTypeCheckingExtension- Parameters:
pexp- the unresolved property- Returns:
booleanfalse if this extension doesn't resolve the property, true if it resolves the property.
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handleUnresolvedAttribute
public boolean handleUnresolvedAttribute(AttributeExpression aexp)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker when an attribute expression cannot be resolved (for example, when an attribute doesn't exist). It gives the extension a chance to resolve it.- Overrides:
handleUnresolvedAttributein classTypeCheckingExtension- Parameters:
aexp- the unresolved attribute- Returns:
booleanfalse if this extension doesn't resolve the attribute, true if it resolves the attribute.
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handleIncompatibleAssignment
public boolean handleIncompatibleAssignment(ClassNode lhsType, ClassNode rhsType, Expression assignmentExpression)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker when an assignment is not allowed by the type checker. Extensions may override this method to allow such assignments where the type checker normally disallows them.- Overrides:
handleIncompatibleAssignmentin classTypeCheckingExtension- Parameters:
lhsType- the type of the left hand side of the assignment, as found by the type checkerrhsType- the type of the right hand side of the assignment, as found by the type checkerassignmentExpression- the assignment expression which triggered this call- Returns:
booleanfalse if the extension does not handle this assignment, true otherwise
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handleIncompatibleReturnType
public boolean handleIncompatibleReturnType(ReturnStatement returnStatement, ClassNode inferredReturnType)
Description copied from class:TypeCheckingExtensionAllows the extension to catch incompatible return types. This event is called whenever the type checker finds that an inferred return type is incompatible with the declared return type of a method.- Overrides:
handleIncompatibleReturnTypein classTypeCheckingExtension- Parameters:
returnStatement- the statement that triggered the errorinferredReturnType- the inferred return type for this statement- Returns:
- false if the extension doesn't handle the error, true otherwise
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handleAmbiguousMethods
public java.util.List<MethodNode> handleAmbiguousMethods(java.util.List<MethodNode> nodes, Expression origin)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker before throwing an "ambiguous method" error, giving the chance to the extension to select the method properly. This means that when this method is called, the "nodes" parameter contains at least two methods. If the returned list still contains at least two methods, then the type checker will throw an ambiguous method call error. If the returned method contains 1 element, then the type checker will not throw any error. It is invalid to return an empty list.- Overrides:
handleAmbiguousMethodsin classTypeCheckingExtension- Parameters:
nodes- the list of ambiguous methodsorigin- the expression which originated the method selection process- Returns:
- a single element list of disambiguated selection, or more elements if still ambiguous. It is not allowed to return an empty list.
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handleMissingMethod
public java.util.List<MethodNode> handleMissingMethod(ClassNode receiver, java.lang.String name, ArgumentListExpression argumentList, ClassNode[] argumentTypes, MethodCall call)
Description copied from class:TypeCheckingExtensionThis method is called by the type checker when a method call cannot be resolved. Extensions may override this method to handle missing methods and prevent the type checker from throwing an error.- Overrides:
handleMissingMethodin classTypeCheckingExtension- Parameters:
receiver- the type of the receivername- the name of the called methodargumentList- the list of arguments of the callargumentTypes- the types of the arguments of the callcall- the method call itself, if needed- Returns:
- an empty list if the extension cannot resolve the method, or a list of potential methods if the extension finds candidates. This method must not return null.
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afterVisitMethod
public void afterVisitMethod(MethodNode node)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks after the type checker actually visited a method node. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
afterVisitMethodin classTypeCheckingExtension- Parameters:
node- a method node
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beforeVisitMethod
public boolean beforeVisitMethod(MethodNode node)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks before the type checker actually visits a method node. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
beforeVisitMethodin classTypeCheckingExtension- Parameters:
node- a method node- Returns:
- false if the type checker should visit the node, or true if this extension replaces what the type checker would do with the method.
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afterVisitClass
public void afterVisitClass(ClassNode node)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks after the type checker actually visited a class node. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
afterVisitClassin classTypeCheckingExtension- Parameters:
node- a class node
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beforeVisitClass
public boolean beforeVisitClass(ClassNode node)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks before the type checker actually visits a class node. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
beforeVisitClassin classTypeCheckingExtension- Parameters:
node- a class node- Returns:
- false if the type checker should visit the node, or true if this extension replaces what the type checker would do with the class.
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afterMethodCall
public void afterMethodCall(MethodCall call)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks after the type checker actually visits a method call. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
afterMethodCallin classTypeCheckingExtension- Parameters:
call- a method call, either aMethodCallExpression,StaticMethodCallExpression, orConstructorCallExpression
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beforeMethodCall
public boolean beforeMethodCall(MethodCall call)
Description copied from class:TypeCheckingExtensionAllows the extension to perform additional tasks before the type checker actually visits a method call. Compared to a custom visitor, this method ensures that the node being visited is a node which would have been visited by the type checker. This is in particular important for nodes which are marked withTypeCheckingMode.SKIP.- Overrides:
beforeMethodCallin classTypeCheckingExtension- Parameters:
call- a method call, either aMethodCallExpression,StaticMethodCallExpression, orConstructorCallExpression- Returns:
- false if the type checker should visit the node, or true if this extension replaces what the type checker would do with the method call.
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onMethodSelection
public void onMethodSelection(Expression expression, MethodNode target)
Description copied from class:TypeCheckingExtensionAllows the extension to listen to method selection events. Given an expression, which may be a method call expression, a static method call expression, a pre/postfix expression, ..., if a corresponding method is found, this method is called.- Overrides:
onMethodSelectionin classTypeCheckingExtension- Parameters:
expression- the expression for which a corresponding method has been foundtarget- the method which has been chosen by the type checker
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setup
public void setup()
Description copied from class:TypeCheckingExtensionSubclasses should implement this method whenever they need to perform special checks before the type checker starts working.- Overrides:
setupin classTypeCheckingExtension
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finish
public void finish()
Description copied from class:TypeCheckingExtensionSubclasses should implement this method if they need to perform additional checks after the type checker has finished its work. This is particularly useful for situations where you need multiple passes. Some checks in that case may be deferred to the end, using this method.- Overrides:
finishin classTypeCheckingExtension
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