org.jboss.msc.value
Class Values

java.lang.Object
  org.jboss.msc.value.Values

public final class Values
extends Object

Value utility methods.

Author:

David M. Lloyd

Field Summary

static List<Value<?>>	EMPTY_LIST The empty value list.
static List<? extends Value<Class<?>>>	EMPTY_TYPE_LIST The empty value type list.

Method Summary

static <T> Value<T>	asSuperclass(Value<? extends T> value) Safely re-cast a value as its superclass.
static <T> Value<T>	cached(Value<T> value) Get a cached value for some opaque value.
static <T> List<Value<? extends T>>	emptyList() The empty value list.
static <T> Value<List<T>>	emptyListValue() A value which yields the empty list.
static Object[]	getValues(Iterable<? extends Value<?>> i) Get an object array from the result of an iterable series of values.
static <T> T[]	getValues(Iterable<? extends Value<? extends T>> i, Class<T> clazz) Get a typed object array from the result of an iterable series of values.
static <T> T[]	getValues(Iterable<? extends Value<? extends T>> i, T[] array) Get a typed object array from the result of an iterable series of values.
static <T> Value<T>	immediateValue(T value) Get an immediate value.
static <T> List<Value<? extends T>>	immediateValues(List<T> values)
static <T> List<Value<? extends T>>	immediateValues(T... values)
static ThreadLocalValue<Object>	injectedValue() The special value representing the value of an injection operation.
static <T> Value<T>	nullValue() Get the null value.
static ThreadLocalValue<Object>	thisValue() The special value representing this (the object being invoked upon).

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_LIST

public static final List<Value<?>> EMPTY_LIST

The empty value list.

EMPTY_TYPE_LIST

public static final List<? extends Value<Class<?>>> EMPTY_TYPE_LIST

The empty value type list.

Method Detail

getValues

public static Object[] getValues(Iterable<? extends Value<?>> i)

Get an object array from the result of an iterable series of values.

Parameters:

i - the iterable series

Returns:

the values array

getValues

public static <T> T[] getValues(Iterable<? extends Value<? extends T>> i,
                                Class<T> clazz)

Get a typed object array from the result of an iterable series of values.

Parameters:

i - the iterable series

clazz - the resultant array type

Returns:

the values array

getValues

public static <T> T[] getValues(Iterable<? extends Value<? extends T>> i,
                                T[] array)

Get a typed object array from the result of an iterable series of values.

Parameters:

i - the iterable series

array - the array to populate

Returns:

the values array

nullValue

public static <T> Value<T> nullValue()

Get the null value.

Type Parameters:

T - the value type

Returns:

a value which always yields null

cached

public static <T> Value<T> cached(Value<T> value)

Get a cached value for some opaque value. If the value is already cached, it is returned as-is.

Type Parameters:

T - the value type

Parameters:

value - the value to wrap

Returns:

a cached value

emptyList

public static <T> List<Value<? extends T>> emptyList()

The empty value list.

Type Parameters:

T - the value type

Returns:

the empty value list

immediateValue

public static <T> Value<T> immediateValue(T value)

Get an immediate value.

Type Parameters:

T - the value type

Parameters:

value - the value to return

Returns:

the immediate value

emptyListValue

public static <T> Value<List<T>> emptyListValue()

A value which yields the empty list.

Type Parameters:

T - the list member type

Returns:

the empty list value

immediateValues

public static <T> List<Value<? extends T>> immediateValues(List<T> values)

immediateValues

public static <T> List<Value<? extends T>> immediateValues(T... values)

asSuperclass

public static <T> Value<T> asSuperclass(Value<? extends T> value)

Safely re-cast a value as its superclass.

Type Parameters:

T - the value type

Parameters:

value - the value to re-cast

Returns:

the value

thisValue

public static ThreadLocalValue<Object> thisValue()

The special value representing this (the object being invoked upon).

Returns:

the value for this

injectedValue

public static ThreadLocalValue<Object> injectedValue()

The special value representing the value of an injection operation.

Returns:

the target value