org.assertj.core.util
Class Collections

java.lang.Object
  org.assertj.core.util.Collections

public final class Collections
extends Object

Utility methods related to Collections.

Author:

Yvonne Wang, Alex Ruiz, Joel Costigliola

Method Summary

static <T> Collection<T>	duplicatesFrom(Collection<T> c) Returns any duplicate elements from the given Collection.
static String	format(Collection<?> c) Returns the String standard representation of the given Collection, or null if the given Collection is null.
static String	format(Collection<?> c, String start, String end) Returns the String standard representation of the given Collection, or null if the given Collection is null.
static String	format(Representation p, Collection<?> c) Returns the String representation of the given Collection, or null if the given Collection is null.
static String	format(Representation p, Collection<?> c, String start, String end) Returns the String representation of the given Collection, or null if the given Collection is null.
static boolean	isNullOrEmpty(Collection<?> c) Indicates whether the given Collection is null or empty.
static <T> List<T>	nonNullElementsIn(Collection<T> c) Returns all the non-null elements in the given Collection.

Methods inherited from class java.lang.Object

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

Method Detail

duplicatesFrom

public static <T> Collection<T> duplicatesFrom(Collection<T> c)

Returns any duplicate elements from the given Collection.

Type Parameters:

T - the generic type of the given Collection.

Parameters:

c - the given Collection that might have duplicate elements.

Returns:

a Collection containing the duplicate elements of the given one. If no duplicates are found, an empty Collection is returned.

isNullOrEmpty

public static boolean isNullOrEmpty(Collection<?> c)

Indicates whether the given Collection is null or empty.

Parameters:

c - the given Collection.

Returns:

true if the given Collection is null or empty, otherwise false.

format

public static String format(Collection<?> c)

Returns the String standard representation of the given Collection, or null if the given Collection is null.

Parameters:

c - the Collection to format.

Returns:

the String representation of the given Collection.

format

public static String format(Representation p,
                            Collection<?> c)

Returns the String representation of the given Collection, or null if the given Collection is null.

Parameters:

p -

c - the Collection to format.

Returns:

the String representation of the given Collection.

format

public static String format(Collection<?> c,
                            String start,
                            String end)

Returns the String standard representation of the given Collection, or null if the given Collection is null.

Parameters:

c - the Collection to format.

Returns:

the String representation of the given Collection.

format

public static String format(Representation p,
                            Collection<?> c,
                            String start,
                            String end)

Returns the String representation of the given Collection, or null if the given Collection is null.

Parameters:

p -

c - the Collection to format.

Returns:

the String representation of the given Collection.

nonNullElementsIn

public static <T> List<T> nonNullElementsIn(Collection<T> c)

Returns all the non-null elements in the given Collection.

Type Parameters:

T - the type of elements of the Collection.

Parameters:

c - the given Collection.

Returns:

all the non-null elements in the given Collection. An empty list is returned if the given Collection is null.

Since:

1.1.3