Class CollectionTestOps

java.lang.Object

org.soliscode.test.util.CollectionTestOps

public final class CollectionTestOps
extends Object

This class consists exclusively of static methods that operate on or return collections.

The methods of this class all throw a NullPointerException if the iterables or class objects provided to them are null.

Since:

1.0.0

Author:

evanbergstrom

Method Summary

Modifier and Type	Method	Description
static Class<?>	getGenericParameter(@NotNull Object o, int parameter)	Gets the class of the a generic parameter form an instance of the generic class.
static <E> List<E>	listOf(E e1, E e2, E e3)
static <E> Collection<E>	preventNulls(Collection<E> c)	Creates a collection backed by the provided collection that does not accept null values as elements.
static <E> List<E>	preventNulls(List<E> c)	Creates a collection backed by the provided collection that does not accept null values as elements.
static <E> Collection<E>	removeAllByIdentity(Collection<E> c, Collection<?> e)	Removed all the elements in a collection that have the same identity as the elements in another collection.
static String	toCSVString(Collection<?> collection)

Methods inherited from class java.lang.Object

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

Method Details

removeAllByIdentity

public static <E> Collection<E> removeAllByIdentity(Collection<E> c,
 Collection<?> e)

Removed all the elements in a collection that have the same identity as the elements in another collection.

Type Parameters:

E - the element type.

Parameters:

c - the collection to remove the elements from

e - the collection of elements to remove.

Returns:

the collection without the removed elements.

preventNulls

public static <E> Collection<E> preventNulls(Collection<E> c)

Creates a collection backed by the provided collection that does not accept null values as elements.

Type Parameters:

E - The element type of the collection

Parameters:

c - The collection.

Returns:

A collection that does not accept null values.

preventNulls

public static <E> List<E> preventNulls(List<E> c)

Creates a collection backed by the provided collection that does not accept null values as elements.

Type Parameters:

E - The element type of the collection

Parameters:

c - The collection.

Returns:

A collection that does not accept null values.

listOf

public static <E> List<E> listOf(E e1,
 E e2,
 E e3)

getGenericParameter

public static Class<?> getGenericParameter(@NotNull
 @NotNull Object o,
 int parameter)

Gets the class of the a generic parameter form an instance of the generic class.

Parameters:

o - an instance of a generic class.

parameter - the index of the generic parameter to get the class for.

Returns:

the class object fo the generic parameter.

toCSVString

public static String toCSVString(Collection<?> collection)