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package org.hamcrest.core;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import static org.hamcrest.core.IsEqual.equalTo;
import static org.hamcrest.core.IsInstanceOf.instanceOf;
/**
* Decorates another Matcher, retaining the behaviour but allowing tests
* to be slightly more expressive.
*
* For example: assertThat(cheese, equalTo(smelly))
* vs. assertThat(cheese, is(equalTo(smelly)))
*/
public class Is<T> extends BaseMatcher<T> {
private final Matcher<T> matcher;
public Is(Matcher<T> matcher) {
this.matcher = matcher;
}
@Override
public boolean matches(Object arg) {
return matcher.matches(arg);
}
@Override
public void describeTo(Description description) {
description.appendText("is ").appendDescriptionOf(matcher);
}
@Override
public void describeMismatch(Object item, Description mismatchDescription) {
matcher.describeMismatch(item, mismatchDescription);
}
/**
* Decorates another Matcher, retaining its behaviour, but allowing tests
* to be slightly more expressive.
* For example:
* <pre>assertThat(cheese, is(equalTo(smelly)))</pre>
* instead of:
* <pre>assertThat(cheese, equalTo(smelly))</pre>
*
*/
public static <T> Matcher<T> is(Matcher<T> matcher) {
return new Is<T>(matcher);
}
/**
* A shortcut to the frequently used <code>is(equalTo(x))</code>.
* For example:
* <pre>assertThat(cheese, is(smelly))</pre>
* instead of:
* <pre>assertThat(cheese, is(equalTo(smelly)))</pre>
*
*/
public static <T> Matcher<T> is(T value) {
return is(equalTo(value));
}
/**
* A shortcut to the frequently used <code>is(instanceOf(SomeClass.class))</code>.
* For example:
* <pre>assertThat(cheese, isA(Cheddar.class))</pre>
* instead of:
* <pre>assertThat(cheese, is(instanceOf(Cheddar.class)))</pre>
*
*/
public static <T> Matcher<T> isA(Class<T> type) {
final Matcher<T> typeMatcher = instanceOf(type);
return is(typeMatcher);
}
}
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