org.hamcrest.core
Class IsNull<T>

java.lang.Object
  org.hamcrest.BaseMatcher<T>
      org.hamcrest.core.IsNull<T>

All Implemented Interfaces:

Matcher<T>, SelfDescribing

public class IsNull<T>
extends BaseMatcher<T>

Is the value null?

Constructor Summary

IsNull()

Method Summary

void	describeTo(Description description) Generates a description of the object.
boolean	matches(Object o) Evaluates the matcher for argument item.
static <T> Matcher<T>	notNullValue() Matches if value is not null.
static <T> Matcher<T>	notNullValue(Class<T> type) Matches if value is not null.
static <T> Matcher<T>	nullValue() Matches if value is null.
static <T> Matcher<T>	nullValue(Class<T> type) Matches if value is null.

Methods inherited from class org.hamcrest.BaseMatcher

_dont_implement_Matcher___instead_extend_BaseMatcher_, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNull

public IsNull()

Method Detail

matches

public boolean matches(Object o)

Description copied from interface: Matcher

Evaluates the matcher for argument item.

This method matches against Object, instead of the generic type T. This is because the caller of the Matcher does not know at runtime what the type is (because of type erasure with Java generics). It is down to the implementations to check the correct type.

Parameters:

o - the object against which the matcher is evaluated.

Returns:

true if item matches, otherwise false.

See Also:

BaseMatcher

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.

nullValue

public static <T> Matcher<T> nullValue()

Matches if value is null.

notNullValue

public static <T> Matcher<T> notNullValue()

Matches if value is not null.

nullValue

public static <T> Matcher<T> nullValue(Class<T> type)

Matches if value is null. With type inference.

notNullValue

public static <T> Matcher<T> notNullValue(Class<T> type)

Matches if value is not null. With type inference.