org.wandora.utils

Class GripCollections

java.lang.Object

org.wandora.utils.GripCollections

public class GripCollections
extends java.lang.Object

This class provides some methods that make it easier to create and convert between collections, arrays and maps.

Author:

olli

Constructor Summary

Constructors

Constructor and Description
GripCollections() Creates a new instance of GripCollections

Method Summary

Modifier and Type	Method and Description
static <K,V> java.util.Map<K,V>	addArrayToMap(java.util.Map<K,V> map, java.lang.Object[] items) Adds items from the specified array to the map.
static <T,C extends java.util.Collection<? super T>> C	arrayToCollection(C c, T[] array) Fills the given Collection with the elements of the given array and returns the Collection.
static <T> java.util.Vector<T>	arrayToCollection(T[] array) Creates a Vector from the T[] array.
static boolean	collectionsOverlap(java.util.Collection a, java.util.Collection b) Checks if there is at least one common element in the two specified collections.
static <T> T[]	collectionToArray(java.util.Collection<? extends T> c, java.lang.Class<T> cls) Creates a new T[] array where T is the same class as cls parameter and fills it with elements of the given collection and then returns it.
static <T,C extends java.util.Collection<? super T>> C	newCollection(C c, T... objs) Fills the given Collection with the other parameters and returns the Collection.
static <T> java.util.HashSet<T>	newHashSet(T... objs) Creates a new HashSet, fills it with the parameters and returns it.
static <T> java.util.Vector<T>	newVector(T... objs) Creates a new Vector, fills it with the parameters and returns it.

Methods inherited from class java.lang.Object

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

Constructor Detail

GripCollections

public GripCollections()

Creates a new instance of GripCollections

Method Detail

arrayToCollection

public static <T> java.util.Vector<T> arrayToCollection(T[] array)

Creates a Vector from the T[] array.

arrayToCollection

public static <T,C extends java.util.Collection<? super T>> C arrayToCollection(C c,
                                                                                T[] array)

Fills the given Collection with the elements of the given array and returns the Collection.

newCollection

public static <T,C extends java.util.Collection<? super T>> C newCollection(C c,
                                                                            T... objs)

Fills the given Collection with the other parameters and returns the Collection.

newVector

public static <T> java.util.Vector<T> newVector(T... objs)

Creates a new Vector, fills it with the parameters and returns it.

newHashSet

public static <T> java.util.HashSet<T> newHashSet(T... objs)

Creates a new HashSet, fills it with the parameters and returns it.

collectionToArray

public static <T> T[] collectionToArray(java.util.Collection<? extends T> c,
                                        java.lang.Class<T> cls)

Creates a new T[] array where T is the same class as cls parameter and fills it with elements of the given collection and then returns it.

addArrayToMap

public static <K,V> java.util.Map<K,V> addArrayToMap(java.util.Map<K,V> map,
                                                     java.lang.Object[] items)

Adds items from the specified array to the map. Items with even index are used as keys of the items following them in the array.

collectionsOverlap

public static boolean collectionsOverlap(java.util.Collection a,
                                         java.util.Collection b)

Checks if there is at least one common element in the two specified collections.