org.graalvm.polyglot

Class TypeLiteral<T>

java.lang.Object

org.graalvm.polyglot.TypeLiteral<T>

public abstract class TypeLiteral<T>
extends Object

Represents a generic type T. Java doesn't yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval of the type information even at runtime.

For example, to create a type literal for List<String>, you can create an empty anonymous inner class:

TypeLiteral<List<String>> list = new TypeLiteral<List<String>>() {};

Since:

19.0

See Also:

Value.as(TypeLiteral)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TypeLiteral() Constructs a new type literal.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
Class<T>	getRawType() Returns the raw class type of the literal.
Type	getType() Returns the type literal including generic type information.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TypeLiteral

protected TypeLiteral()

Constructs a new type literal. Derives represented class from type parameter.

Clients create an empty anonymous subclass. Doing so embeds the type parameter in the anonymous class's type hierarchy so we can reconstitute it at runtime despite erasure.

Since:

19.0

Method Detail

getType

public final Type getType()

Returns the type literal including generic type information.

Since:

19.0

getRawType

public final Class<T> getRawType()

Returns the raw class type of the literal.

Since:

19.0

equals

public final boolean equals(Object obj)

Overrides:

equals in class Object

Since:

19.0

hashCode

public final int hashCode()

Overrides:

hashCode in class Object

Since:

19.0

toString

public final String toString()

Overrides:

toString in class Object

Since:

19.0