com.programix.collections
Class CollectionsTools

java.lang.Object
  com.programix.collections.CollectionsTools

public class CollectionsTools
extends Object

Utility methods for working with the Collections API. Unless otherwise stated, these methods are not thread-safe.

Author:

Paul Hyde

See Also:

ReverseComparator, ComparableComparator, NullFirstComparator, NullLastComparator

Field Summary

static Comparator	NULL_FIRST_COMPARABLE_ASC This Comparator sorts Comparable objects in their normal ordering, but with any null's that may be present sorted to the top.
static Comparator	NULL_FIRST_COMPARABLE_DESC This Comparator sorts Comparable objects in their reverse ordering, but with any null's that may be present sorted to the top.
static Comparator	NULL_LAST_COMPARABLE_ASC This Comparator sorts Comparable objects in their normal ordering, but with any null's that may be present sorted to the bottom.
static Comparator	NULL_LAST_COMPARABLE_DESC This Comparator sorts Comparable objects in their reverse ordering, but with any null's that may be present sorted to the bottom.

Method Summary

static boolean	isEmpty(Collection collection) Returns true if the passed reference is null or if the size of the collection is 0.
static boolean	isNotEmpty(Collection collection) Returns true if the passed reference is not null and the size of the collection greater than 0.
static char[]	toCharArray(Collection charList) Converts a Collection holding instances of Character into a char[].
static int[]	toIntArray(Collection integerList) Converts a collection of Number to an int[].
static String[]	toStringArray(Collection strings)

Methods inherited from class java.lang.Object

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

Field Detail

NULL_FIRST_COMPARABLE_ASC

public static final Comparator NULL_FIRST_COMPARABLE_ASC

This Comparator sorts Comparable objects in their normal ordering, but with any null's that may be present sorted to the top.

See Also:

NullFirstComparator, NullLastComparator, ReverseComparator, ComparableComparator

NULL_FIRST_COMPARABLE_DESC

public static final Comparator NULL_FIRST_COMPARABLE_DESC

This Comparator sorts Comparable objects in their reverse ordering, but with any null's that may be present sorted to the top.

See Also:

NullFirstComparator, NullLastComparator, ReverseComparator, ComparableComparator

NULL_LAST_COMPARABLE_ASC

public static final Comparator NULL_LAST_COMPARABLE_ASC

This Comparator sorts Comparable objects in their normal ordering, but with any null's that may be present sorted to the bottom.

See Also:

NullFirstComparator, NullLastComparator, ReverseComparator, ComparableComparator

NULL_LAST_COMPARABLE_DESC

public static final Comparator NULL_LAST_COMPARABLE_DESC

This Comparator sorts Comparable objects in their reverse ordering, but with any null's that may be present sorted to the bottom.

See Also:

NullFirstComparator, NullLastComparator, ReverseComparator, ComparableComparator

Method Detail

toStringArray

public static String[] toStringArray(Collection strings)

toIntArray

public static int[] toIntArray(Collection integerList)

Converts a collection of Number to an int[].

toCharArray

public static char[] toCharArray(Collection charList)

Converts a Collection holding instances of Character into a char[].

isEmpty

public static boolean isEmpty(Collection collection)

Returns true if the passed reference is null or if the size of the collection is 0.

isNotEmpty

public static boolean isNotEmpty(Collection collection)

Returns true if the passed reference is not null and the size of the collection greater than 0.