org.python.util
Class Generic

java.lang.Object
  org.python.util.Generic

public class Generic
extends Object

Static methods to make instances of collections with their generic types inferred from what they're being assigned to. The idea is stolen from Sets, Lists and Maps from Google Collections.

Field Summary

static int	CHM_CONCURRENCY_LEVEL
static int	CHM_INITIAL_CAPACITY Our default ConcurrentHashMap sizes.
static float	CHM_LOAD_FACTOR

Constructor Summary

Generic()

Method Summary

static <K,V> ConcurrentMap<K,V>	concurrentMap() Makes a ConcurrentMap using generic types inferred from whatever this is being assigned to.
static <E> Set<E>	concurrentSet() Makes a Set, ensuring safe concurrent operations, using generic types inferred from whatever this is being assigned to.
static <T> List<T>	list() Makes a List with its generic type inferred from whatever it's being assigned to.
static <T,U extends T> List<T>	list(U... contents) Makes a List with its generic type inferred from whatever it's being assigned to filled with the items in contents.
static <K,V> Map<K,V>	map() Makes a Map using generic types inferred from whatever this is being assigned to.
static <E> Set<E>	newSetFromMap(Map<E,Boolean> map) Return a Set backed by the specified Map with the same ordering, concurrency and performance characteristics.
static <E> Set<E>	set() Makes a Set using the generic type inferred from whatever this is being assigned to.
static <T,U extends T> Set<T>	set(U... contents) Makes a Set using the generic type inferred from whatever this is being assigned to filled with the items in contents.

Methods inherited from class java.lang.Object

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

Field Detail

CHM_INITIAL_CAPACITY

public static final int CHM_INITIAL_CAPACITY

Our default ConcurrentHashMap sizes. Only concurreny level differs from ConcurrentHashMap's defaults: it's significantly lower to reduce allocation cost.

See Also:

Constant Field Values

CHM_LOAD_FACTOR

public static final float CHM_LOAD_FACTOR

See Also:

Constant Field Values

CHM_CONCURRENCY_LEVEL

public static final int CHM_CONCURRENCY_LEVEL

See Also:

Constant Field Values

Constructor Detail

Generic

public Generic()

Method Detail

list

public static <T> List<T> list()

Makes a List with its generic type inferred from whatever it's being assigned to.

list

public static <T,U extends T> List<T> list(U... contents)

Makes a List with its generic type inferred from whatever it's being assigned to filled with the items in contents.

map

public static <K,V> Map<K,V> map()

Makes a Map using generic types inferred from whatever this is being assigned to.

concurrentMap

public static <K,V> ConcurrentMap<K,V> concurrentMap()

Makes a ConcurrentMap using generic types inferred from whatever this is being assigned to.

set

public static <E> Set<E> set()

Makes a Set using the generic type inferred from whatever this is being assigned to.

set

public static <T,U extends T> Set<T> set(U... contents)

Makes a Set using the generic type inferred from whatever this is being assigned to filled with the items in contents.

concurrentSet

public static <E> Set<E> concurrentSet()

Makes a Set, ensuring safe concurrent operations, using generic types inferred from whatever this is being assigned to.

newSetFromMap

public static <E> Set<E> newSetFromMap(Map<E,Boolean> map)

Return a Set backed by the specified Map with the same ordering, concurrency and performance characteristics. The specified Map must be empty at the time this method is invoked. Note that this method is based on Java 6's Collections.newSetFromMap, and will be removed in a future version of Jython (likely 2.6) that will rely on Java 6.

Parameters:

map - the backing Map

Returns:

a Set backed by the Map

Throws:

IllegalArgumentException - if Map is not empty