org.hamcrest.collection

Class IsEmptyCollection<E>

java.lang.Object

org.hamcrest.BaseMatcher<T>

org.hamcrest.TypeSafeMatcher<java.util.Collection<? extends E>>

org.hamcrest.collection.IsEmptyCollection<E>

All Implemented Interfaces:

Matcher<java.util.Collection<? extends E>>, SelfDescribing

public class IsEmptyCollection<E>
extends TypeSafeMatcher<java.util.Collection<? extends E>>

Tests if collection is empty.

Constructor Summary

Constructors

Constructor and Description
IsEmptyCollection()

Method Summary

Modifier and Type	Method and Description
void	describeMismatchSafely(java.util.Collection<? extends E> item, Description mismatchDescription) Subclasses should override this.
void	describeTo(Description description) Generates a description of the object.
static <E> Matcher<java.util.Collection<? extends E>>	empty() Creates a matcher for Collections matching examined collections whose isEmpty method returns true.
static <E> Matcher<java.util.Collection<E>>	emptyCollectionOf(java.lang.Class<E> unusedToForceReturnType) Creates a matcher for Collections matching examined collections whose isEmpty method returns true.
boolean	matchesSafely(java.util.Collection<? extends E> item) Subclasses should implement this.

Methods inherited from class org.hamcrest.TypeSafeMatcher

describeMismatch, matches

Methods inherited from class org.hamcrest.BaseMatcher

_dont_implement_Matcher___instead_extend_BaseMatcher_, isNotNull, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IsEmptyCollection

public IsEmptyCollection()

Method Detail

matchesSafely

public boolean matchesSafely(java.util.Collection<? extends E> item)

Description copied from class: TypeSafeMatcher

Subclasses should implement this. The item will already have been checked for the specific type and will never be null.

Specified by:

matchesSafely in class TypeSafeMatcher<java.util.Collection<? extends E>>

describeMismatchSafely

public void describeMismatchSafely(java.util.Collection<? extends E> item,
                                   Description mismatchDescription)

Description copied from class: TypeSafeMatcher

Subclasses should override this. The item will already have been checked for the specific type and will never be null.

Overrides:

describeMismatchSafely in class TypeSafeMatcher<java.util.Collection<? extends E>>

describeTo

public void describeTo(Description description)

Description copied from interface: SelfDescribing

Generates a description of the object. The description may be part of a a description of a larger object of which this is just a component, so it should be worded appropriately.

Parameters:

description - The description to be built or appended to.

empty

public static <E> Matcher<java.util.Collection<? extends E>> empty()

Creates a matcher for Collections matching examined collections whose isEmpty method returns true. For example:

assertThat(new ArrayList<String>(), is(empty()))

emptyCollectionOf

public static <E> Matcher<java.util.Collection<E>> emptyCollectionOf(java.lang.Class<E> unusedToForceReturnType)

Creates a matcher for Collections matching examined collections whose isEmpty method returns true. For example:

assertThat(new ArrayList<String>(), is(emptyCollectionOf(String.class)))

Parameters:

unusedToForceReturnType - the type of the collection's content