cz.cuni.amis.utils.collections
Class MyCollections

java.lang.Object
  cz.cuni.amis.utils.collections.MyCollections

public class MyCollections
extends Object

Nested Class Summary

static interface

MyCollections.IToString

Field Summary

static MyCollections.IToString

TO_STRING

Constructor Summary

MyCollections()

Method Summary

static <T> List<T>	asList(Collection<T> objects)
static <T> List<T>	asList(Collection<T> objects, IFilter filter)
static <T> List<T>	asList(Collection<T> objects, ObjectFilter filter)
static <T> List<T>	asList(T[] objects)
static <T> List<T>	asList(T[] objects, IFilter filter)
static <T> List<T>	asList(T[] objects, ObjectFilter filter)
static <T> List<T>	getFiltered(Collection<T> col, IFilter filter) Returns new list that contains only objects from 'col' that are IFilter.isAccepted(Object).
static <T> T[]	getFiltered(T[] array, IFilter filter) Returns new array that contains only objects from 'array' that are IFilter.isAccepted(Object).
static <T> T	getRandom(Collection<T> col) Returns random element from the collection.
static <T> T	getRandom(List<T> list) Returns random element from the list.
static <T> T	getRandom(T[] array) Returns random element from the array.
static <T> T	getRandomFiltered(Collection<T> col, IFilter filter) Returns random element from the collection that is IFilter.isAccepted(Object) by the 'filter'.
static <T> T	getRandomFiltered(T[] array, IFilter filter) Returns random element from the array that is IFilter.isAccepted(Object) by the 'filter'.
static <T> void	toCollection(T[] array, Collection<T> col) Moves data from 'array' to 'col'.
static <T> void	toList(T[] objects, List<T> list) Adds 'objects' to 'list'.
static <T> void	toList(T[] objects, List<T> list, IFilter filter) Adds 'objects' that satisfies 'filter' to 'list'.
static <T> void	toList(T[] objects, List<T> list, ObjectFilter filter) Adds 'objects' that satisfies 'filter' to 'list'.
static String	toString(Object objToString, String[] prefixes, String[] postfixes, String[] separators, MyCollections.IToString toString)
static String	toString(Object obj, String prefix, String postfix, String separator)
static String	toString(Object obj, String prefix, String postfix, String separator, MyCollections.IToString toString)

Methods inherited from class java.lang.Object

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

Field Detail

TO_STRING

public static final MyCollections.IToString TO_STRING

Constructor Detail

MyCollections

public MyCollections()

Method Detail

getFiltered

public static <T> List<T> getFiltered(Collection<T> col,
                                      IFilter filter)

Returns new list that contains only objects from 'col' that are IFilter.isAccepted(Object).

Type Parameters:

T -

Parameters:

col -

filter -

Returns:

getFiltered

public static <T> T[] getFiltered(T[] array,
                                  IFilter filter)

Returns new array that contains only objects from 'array' that are IFilter.isAccepted(Object).

Type Parameters:

T -

Parameters:

col -

filter -

Returns:

getRandom

public static <T> T getRandom(Collection<T> col)

Returns random element from the collection.

WARNING: O(n) time complexity in the worst case scenario!

Type Parameters:

T -

Parameters:

col -

Returns:

getRandom

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

Returns random element from the list.

O(1) time complexity.

Type Parameters:

T -

Parameters:

list -

Returns:

getRandom

public static <T> T getRandom(T[] array)

Returns random element from the array.

Type Parameters:

T -

Parameters:

array -

Returns:

getRandomFiltered

public static <T> T getRandomFiltered(Collection<T> col,
                                      IFilter filter)

Returns random element from the collection that is IFilter.isAccepted(Object) by the 'filter'.

WARNING: O(n) time complexity in the worst case scenario!

Type Parameters:

T -

Parameters:

col -

filter - if null, performs getRandom(Collection)

Returns:

getRandomFiltered

public static <T> T getRandomFiltered(T[] array,
                                      IFilter filter)

Returns random element from the array that is IFilter.isAccepted(Object) by the 'filter'.

Type Parameters:

T -

Parameters:

array -

Returns:

toList

public static <T> void toList(T[] objects,
                              List<T> list)

Adds 'objects' to 'list'.

Type Parameters:

T -

Parameters:

objects -

list -

toList

public static <T> void toList(T[] objects,
                              List<T> list,
                              ObjectFilter filter)

Adds 'objects' that satisfies 'filter' to 'list'.

Type Parameters:

T -

Parameters:

objects -

list -

filter -

toList

public static <T> void toList(T[] objects,
                              List<T> list,
                              IFilter filter)

Adds 'objects' that satisfies 'filter' to 'list'.

Type Parameters:

T -

Parameters:

objects -

list -

filter -

asList

public static <T> List<T> asList(T[] objects)

asList

public static <T> List<T> asList(Collection<T> objects)

asList

public static <T> List<T> asList(T[] objects,
                                 ObjectFilter filter)

asList

public static <T> List<T> asList(Collection<T> objects,
                                 ObjectFilter filter)

asList

public static <T> List<T> asList(T[] objects,
                                 IFilter filter)

asList

public static <T> List<T> asList(Collection<T> objects,
                                 IFilter filter)

toString

public static String toString(Object objToString,
                              String[] prefixes,
                              String[] postfixes,
                              String[] separators,
                              MyCollections.IToString toString)

toString

public static String toString(Object obj,
                              String prefix,
                              String postfix,
                              String separator)

toString

public static String toString(Object obj,
                              String prefix,
                              String postfix,
                              String separator,
                              MyCollections.IToString toString)

toCollection

public static <T> void toCollection(T[] array,
                                    Collection<T> col)

Moves data from 'array' to 'col'. NPE shielded.

Parameters:

array -

col -