public class

ParameterizedTypeImpl

extends Object
implements ParameterizedType
java.lang.Object
   ↳ sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl

Class Overview

Implementing class for ParameterizedType interface.

Summary

Public Methods
boolean equals(Object o)
Indicates whether some other object is "equal to" this one.
Type[] getActualTypeArguments()
Returns an array of Type objects representing the actual type arguments to this type.
Type getOwnerType()
Returns a Type object representing the type that this type is a member of.
Class<?> getRawType()
Returns the Type object representing the class or interface that declared this type.
int hashCode()
Returns a hash code value for the object.
static ParameterizedTypeImpl make(Class<?> rawType, Type[] actualTypeArguments, Type ownerType)
Static factory.
String toString()
Returns a string representation of the object.
[Expand]
Inherited Methods
From class java.lang.Object
From interface java.lang.reflect.ParameterizedType

Public Methods

public boolean equals (Object o)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Parameters
o the reference object with which to compare.
Returns
  • true if this object is the same as the obj argument; false otherwise.

public Type[] getActualTypeArguments ()

Returns an array of Type objects representing the actual type arguments to this type.

Note that in some cases, the returned array be empty. This can occur if this type represents a non-parameterized type nested within a parameterized type.

Returns
  • an array of Type objects representing the actual type arguments to this type
Throws
if any of the actual type arguments refers to a non-existent type declaration
if any of the actual type parameters refer to a parameterized type that cannot be instantiated for any reason

public Type getOwnerType ()

Returns a Type object representing the type that this type is a member of. For example, if this type is O.I, return a representation of O.

If this type is a top-level type, null is returned.

Returns
  • a Type object representing the type that this type is a member of. If this type is a top-level type, null is returned
Throws
if the owner type refers to a non-existent type declaration
if the owner type refers to a parameterized type that cannot be instantiated for any reason

public Class<?> getRawType ()

Returns the Type object representing the class or interface that declared this type.

Returns
  • the Type object representing the class or interface that declared this type

public int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

Returns
  • a hash code value for this object.

public static ParameterizedTypeImpl make (Class<?> rawType, Type[] actualTypeArguments, Type ownerType)

Static factory. Given a (generic) class, actual type arguments and an owner type, creates a parameterized type. This class can be instantiated with a a raw type that does not represent a generic type, provided the list of actual type arguments is empty. If the ownerType argument is null, the declaring class of the raw type is used as the owner type.

This method throws a MalformedParameterizedTypeException under the following circumstances: If the number of actual type arguments (i.e., the size of the array typeArgs) does not correspond to the number of formal type arguments. If any of the actual type arguments is not an instance of the bounds on the corresponding formal.

Parameters
rawType the Class representing the generic type declaration being instantiated
actualTypeArguments - a (possibly empty) array of types representing the actual type arguments to the parameterized type
ownerType - the enclosing type, if known.
Returns
  • An instance of ParameterizedType
Throws
MalformedParameterizedTypeException - if the instantiation is invalid

public String toString ()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of: 

 getClass().getName() + '@' + Integer.toHexString(hashCode())

Returns
  • a string representation of the object.