Class MethodMap
java.lang.Object
org.codehaus.plexus.util.introspection.MethodMap
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- $Id$
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
simple distinguishable exception, used when we run across ambiguous overloading -
Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int
private static final int
Keep track of all methods with the same name.private static final int
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
Add a method to a list of methods by name.Find a method.Return a list of methods with the same name.private static LinkedList<Method>
getApplicables
(List<Method> methods, Class[] classes) Returns all methods that are applicable to actual argument types.private static Method
getMostSpecific
(List<Method> methods, Class[] classes) private static boolean
isApplicable
(Method method, Class[] classes) Returns true if the supplied method is applicable to actual argument types.private static boolean
isMethodInvocationConvertible
(Class formal, Class actual) Determines whether a type represented by a class object is convertible to another type represented by a class object using a method invocation conversion, treating object types of primitive types as if they were primitive types (that is, a Boolean actual parameter type matches boolean primitive formal type).private static boolean
isStrictMethodInvocationConvertible
(Class formal, Class actual) Determines whether a type represented by a class object is convertible to another type represented by a class object using a method invocation conversion, without matching object and primitive types.private static int
moreSpecific
(Class[] c1, Class[] c2) Determines which method signature (represented by a class array) is more specific.
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Field Details
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MORE_SPECIFIC
private static final int MORE_SPECIFIC- See Also:
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LESS_SPECIFIC
private static final int LESS_SPECIFIC- See Also:
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INCOMPARABLE
private static final int INCOMPARABLE- See Also:
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methodByNameMap
Keep track of all methods with the same name.
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Constructor Details
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MethodMap
public MethodMap()
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Method Details
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add
Add a method to a list of methods by name. For a particular class we are keeping track of all the methods with the same name.- Parameters:
method
- The method
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get
Return a list of methods with the same name.- Parameters:
key
- The name of the method.- Returns:
- List list of methods
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find
Find a method. Attempts to find the most specific applicable method using the algorithm described in the JLS section 15.12.2 (with the exception that it can't distinguish a primitive type argument from an object type argument, since in reflection primitive type arguments are represented by their object counterparts, so for an argument of type (say) java.lang.Integer, it will not be able to decide between a method that takes int and a method that takes java.lang.Integer as a parameter.
This turns out to be a relatively rare case where this is needed - however, functionality like this is needed.
- Parameters:
methodName
- name of methodargs
- the actual arguments with which the method is called- Returns:
- the most specific applicable method, or null if no method is applicable.
- Throws:
MethodMap.AmbiguousException
- if there is more than one maximally specific applicable method
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getMostSpecific
private static Method getMostSpecific(List<Method> methods, Class[] classes) throws MethodMap.AmbiguousException - Throws:
MethodMap.AmbiguousException
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moreSpecific
Determines which method signature (represented by a class array) is more specific. This defines a partial ordering on the method signatures.- Parameters:
c1
- first signature to comparec2
- second signature to compare- Returns:
- MORE_SPECIFIC if c1 is more specific than c2, LESS_SPECIFIC if c1 is less specific than c2, INCOMPARABLE if they are incomparable.
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getApplicables
Returns all methods that are applicable to actual argument types.- Parameters:
methods
- list of all candidate methodsclasses
- the actual types of the arguments- Returns:
- a list that contains only applicable methods (number of formal and actual arguments matches, and argument types are assignable to formal types through a method invocation conversion).
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isApplicable
Returns true if the supplied method is applicable to actual argument types.- Parameters:
method
- The method to check for applicabilityclasses
- The arguments- Returns:
- true if the method applies to the parameter types
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isMethodInvocationConvertible
Determines whether a type represented by a class object is convertible to another type represented by a class object using a method invocation conversion, treating object types of primitive types as if they were primitive types (that is, a Boolean actual parameter type matches boolean primitive formal type). This behavior is because this method is used to determine applicable methods for an actual parameter list, and primitive types are represented by their object duals in reflective method calls.- Parameters:
formal
- the formal parameter type to which the actual parameter type should be convertibleactual
- the actual parameter type.- Returns:
- true if either formal type is assignable from actual type, or formal is a primitive type and actual is its corresponding object type or an object type of a primitive type that can be converted to the formal type.
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isStrictMethodInvocationConvertible
Determines whether a type represented by a class object is convertible to another type represented by a class object using a method invocation conversion, without matching object and primitive types. This method is used to determine the more specific type when comparing signatures of methods.- Parameters:
formal
- the formal parameter type to which the actual parameter type should be convertibleactual
- the actual parameter type.- Returns:
- true if either formal type is assignable from actual type, or formal and actual are both primitive types and actual can be subject to widening conversion to formal.
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