com.espertech.esper.util

Class CollectionUtil

java.lang.Object

com.espertech.esper.util.CollectionUtil

public class CollectionUtil
extends Object

Utility for handling collection or array tasks.

Field Summary

Fields

Modifier and Type	Field and Description
static Set<MultiKey<EventBean>>	EMPTY_ROW_SET
static SortedMap	EMPTY_SORTED_MAP
static String[]	EMPTY_STRING_ARRAY
static EventBean[]	EVENTBEANARRAY_EMPTY
static Iterable<EventBean>	NULL_EVENT_ITERABLE
static Iterator<EventBean>	NULL_EVENT_ITERATOR
static Set<EventBean>	SINGLE_NULL_ROW_EVENT_SET
static StopCallback	STOP_CALLBACK_NONE

Constructor Summary

Constructors

Constructor and Description
CollectionUtil()

Method Summary

Modifier and Type	Method and Description
static Object	addArrays(Object first, Object second)
static EventBean[]	addArrayWithSetSemantics(EventBean[] arrayOne, EventBean[] arrayTwo)
static void	addEventByKeyLazyListMapBack(Object sortKey, EventBean eventBean, Map<Object,Object> eventMap)
static void	addEventByKeyLazyListMapFront(Object key, EventBean bean, Map<Object,Object> eventMap)
static int[]	addValue(int[] ints, int i)
static Object	arrayExpandAddElements(Object array, Collection elementsToAdd)
static Object	arrayExpandAddElements(Object array, Object[] elementsToAdd)
static Object	arrayExpandAddSingle(Object array, Object elementsToAdd)
static Object	arrayShrinkRemoveSingle(Object array, int index)
static Collection	arrayToCollectionAllowNull(Object array)
static CodegenExpression	arrayToCollectionAllowNullCodegen(Class arrayType, CodegenExpression array, CodegenContext context)
static boolean	compare(String[] otherIndexProps, String[] thisIndexProps)
static String[]	copySortArray(String[] values)
static int	findItem(String[] items, String item)
static Comparator<Object>	getComparator(ExprNode[] sortCriteria, ExprEvaluator[] sortCriteriaEvaluators, boolean isSortUsingCollator, boolean[] isDescendingValues)
static int[]	intArray(Collection<Integer> set) Returns an array of integer values from the set of integer values
static boolean	isAllNullArray(Object array)
static boolean	isAnySet(boolean[] array)
static Collection	iterableToCollection(Iterable iterable) NOTE: Code-generation-invoked method, method name and parameter order matters
static Map<String,Object>	populateNameValueMap(Object... values)
static boolean	removeEventByKeyLazyListMap(Object key, EventBean bean, Map<Object,Object> eventMap)
static <T> int	searchArray(T[] array, T item)
static boolean	sortCompare(String[] valuesOne, String[] valuesTwo)
static String[]	toArray(Collection<String> strings)
static String	toString(Collection<Integer> stack, String delimiterChars)
static <T> String	toString(Collection<T> collection) Returns a list of the elements invoking toString on non-null elements.
static String	toStringArray(Object[] received)
static <K,V> Map<K,V>	twoEntryMap(K k1, V v1, K k2, V v2)

Methods inherited from class java.lang.Object

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

Field Detail

NULL_EVENT_ITERATOR

public static final Iterator<EventBean> NULL_EVENT_ITERATOR

NULL_EVENT_ITERABLE

public static final Iterable<EventBean> NULL_EVENT_ITERABLE

EMPTY_SORTED_MAP

public static final SortedMap EMPTY_SORTED_MAP

EMPTY_ROW_SET

public static final Set<MultiKey<EventBean>> EMPTY_ROW_SET

EVENTBEANARRAY_EMPTY

public static final EventBean[] EVENTBEANARRAY_EMPTY

SINGLE_NULL_ROW_EVENT_SET

public static final Set<EventBean> SINGLE_NULL_ROW_EVENT_SET

EMPTY_STRING_ARRAY

public static final String[] EMPTY_STRING_ARRAY

STOP_CALLBACK_NONE

public static final StopCallback STOP_CALLBACK_NONE

Constructor Detail

CollectionUtil

public CollectionUtil()

Method Detail

getComparator

public static Comparator<Object> getComparator(ExprNode[] sortCriteria,
                                               ExprEvaluator[] sortCriteriaEvaluators,
                                               boolean isSortUsingCollator,
                                               boolean[] isDescendingValues)

toString

public static String toString(Collection<Integer> stack,
                              String delimiterChars)

arrayExpandAddElements

public static Object arrayExpandAddElements(Object array,
                                            Object[] elementsToAdd)

arrayShrinkRemoveSingle

public static Object arrayShrinkRemoveSingle(Object array,
                                             int index)

arrayExpandAddElements

public static Object arrayExpandAddElements(Object array,
                                            Collection elementsToAdd)

arrayExpandAddSingle

public static Object arrayExpandAddSingle(Object array,
                                          Object elementsToAdd)

addValue

public static int[] addValue(int[] ints,
                             int i)

findItem

public static int findItem(String[] items,
                           String item)

intArray

public static int[] intArray(Collection<Integer> set)

Returns an array of integer values from the set of integer values

Parameters:

set - to return array for

Returns:

array

copySortArray

public static String[] copySortArray(String[] values)

sortCompare

public static boolean sortCompare(String[] valuesOne,
                                  String[] valuesTwo)

toString

public static <T> String toString(Collection<T> collection)

Returns a list of the elements invoking toString on non-null elements.

Type Parameters:

T - type

Parameters:

collection - to render

Returns:

comma-separate list of values (no escape)

compare

public static boolean compare(String[] otherIndexProps,
                              String[] thisIndexProps)

isAllNullArray

public static boolean isAllNullArray(Object array)

toStringArray

public static String toStringArray(Object[] received)

populateNameValueMap

public static Map<String,Object> populateNameValueMap(Object... values)

addArrays

public static Object addArrays(Object first,
                               Object second)

addArrayWithSetSemantics

public static EventBean[] addArrayWithSetSemantics(EventBean[] arrayOne,
                                                   EventBean[] arrayTwo)

toArray

public static String[] toArray(Collection<String> strings)

searchArray

public static <T> int searchArray(T[] array,
                                  T item)

removeEventByKeyLazyListMap

public static boolean removeEventByKeyLazyListMap(Object key,
                                                  EventBean bean,
                                                  Map<Object,Object> eventMap)

addEventByKeyLazyListMapBack

public static void addEventByKeyLazyListMapBack(Object sortKey,
                                                EventBean eventBean,
                                                Map<Object,Object> eventMap)

addEventByKeyLazyListMapFront

public static void addEventByKeyLazyListMapFront(Object key,
                                                 EventBean bean,
                                                 Map<Object,Object> eventMap)

isAnySet

public static boolean isAnySet(boolean[] array)

twoEntryMap

public static <K,V> Map<K,V> twoEntryMap(K k1,
                                         V v1,
                                         K k2,
                                         V v2)

arrayToCollectionAllowNull

public static Collection arrayToCollectionAllowNull(Object array)

arrayToCollectionAllowNullCodegen

public static CodegenExpression arrayToCollectionAllowNullCodegen(Class arrayType,
                                                                  CodegenExpression array,
                                                                  CodegenContext context)

iterableToCollection

public static Collection iterableToCollection(Iterable iterable)

NOTE: Code-generation-invoked method, method name and parameter order matters

Parameters:

iterable - iterable

Returns:

collection