com.google.common.primitives
Class Primitives

java.lang.Object
  com.google.common.primitives.Primitives

public final class Primitives
extends Object

Contains static utility methods pertaining to primitive types and their corresponding wrapper types.

Since:

2009.09.15 tentative

Author:

Kevin Bourrillion

Field Summary

static Map<Class<?>,Class<?>>	PRIMITIVE_TO_WRAPPER_TYPE A map from primitive types to their corresponding wrapper types.
static Set<Class<?>>	PRIMITIVE_TYPES All nine primitive types (including void).
static Map<Class<?>,Class<?>>	WRAPPER_TO_PRIMITIVE_TYPE A map from wrapper types to their corresponding primitive types.
static Set<Class<?>>	WRAPPER_TYPES All nine wrapper types (including Void).

Method Summary

static boolean	isWrapperType(Class<?> type) Returns true if type is one of the nine primitive-wrapper types, such as Integer.
static <T> Class<T>	unwrap(Class<T> type) Returns the corresponding primitive type of type if it is a wrapper type; otherwise returns type itself.
static <T> Class<T>	wrap(Class<T> type) Returns the corresponding wrapper type of type if it is a primitive type; otherwise returns type itself.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PRIMITIVE_TO_WRAPPER_TYPE

public static final Map<Class<?>,Class<?>> PRIMITIVE_TO_WRAPPER_TYPE

A map from primitive types to their corresponding wrapper types.

WRAPPER_TO_PRIMITIVE_TYPE

public static final Map<Class<?>,Class<?>> WRAPPER_TO_PRIMITIVE_TYPE

A map from wrapper types to their corresponding primitive types.

PRIMITIVE_TYPES

public static final Set<Class<?>> PRIMITIVE_TYPES

All nine primitive types (including void).

WRAPPER_TYPES

public static final Set<Class<?>> WRAPPER_TYPES

All nine wrapper types (including Void).

Method Detail

isWrapperType

public static boolean isWrapperType(Class<?> type)

Returns true if type is one of the nine primitive-wrapper types, such as Integer.

See Also:

Class.isPrimitive()

wrap

public static <T> Class<T> wrap(Class<T> type)

Returns the corresponding wrapper type of type if it is a primitive type; otherwise returns type itself. Idempotent.

     wrap(int.class) == Integer.class
     wrap(Integer.class) == Integer.class
     wrap(String.class) == String.class
 

unwrap

public static <T> Class<T> unwrap(Class<T> type)

Returns the corresponding primitive type of type if it is a wrapper type; otherwise returns type itself. Idempotent.

     unwrap(Integer.class) == int.class
     unwrap(int.class) == int.class
     unwrap(String.class) == String.class