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java.lang.Object org.hamcrest.BaseMatcher<T> org.hamcrest.core.IsNull<T>
public class IsNull<T>
Is the value null?
Constructor Summary | |
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IsNull()
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Method Summary | ||
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void |
describeTo(Description description)
Generates a description of the object. |
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boolean |
matches(Object o)
Evaluates the matcher for argument item. |
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static Matcher<Object> |
notNullValue()
A shortcut to the frequently used not(nullValue()) . |
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static
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notNullValue(Class<T> type)
A shortcut to the frequently used not(nullValue(X.class)). |
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static Matcher<Object> |
nullValue()
Creates a matcher that matches if examined object is null . |
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static
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nullValue(Class<T> type)
Creates a matcher that matches if examined object is null . |
Methods inherited from class org.hamcrest.BaseMatcher |
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_dont_implement_Matcher___instead_extend_BaseMatcher_, describeMismatch, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public IsNull()
Method Detail |
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public boolean matches(Object o)
Matcher
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.
o
- the object against which the matcher is evaluated.
true
if item matches, otherwise false
.BaseMatcher
public void describeTo(Description description)
SelfDescribing
description
- The description to be built or appended to.public static Matcher<Object> nullValue()
null
.
For example:
assertThat(cheese, is(nullValue())
public static Matcher<Object> notNullValue()
not(nullValue())
.
For example:
assertThat(cheese, is(notNullValue()))instead of:
assertThat(cheese, is(not(nullValue())))
public static <T> Matcher<T> nullValue(Class<T> type)
null
. Accepts a
single dummy argument to facilitate type inference.
For example:
assertThat(cheese, is(nullValue(Cheese.class))
type
- dummy parameter used to infer the generic type of the returned matcherpublic static <T> Matcher<T> notNullValue(Class<T> type)
not(nullValue(X.class)). Accepts a
single dummy argument to facilitate type inference.
.
For example:
assertThat(cheese, is(notNullValue(X.class)))instead of:
assertThat(cheese, is(not(nullValue(X.class))))
type
- dummy parameter used to infer the generic type of the returned matcher
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