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package org.hamcrest.core;
import static org.hamcrest.core.IsInstanceOf.instanceOf;
import static org.hamcrest.core.IsEqual.equalTo;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
/**
* Decorates another Matcher, retaining the behavior but allowing tests
* to be slightly more expressive.
*
* eg. 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;
}
public boolean matches(Object arg) {
return matcher.matches(arg);
}
public void describeTo(Description description) {
description.appendText("is ").appendDescriptionOf(matcher);
}
/**
* Decorates another Matcher, retaining the behavior but allowing tests
* to be slightly more expressive.
*
* eg. assertThat(cheese, equalTo(smelly))
* vs assertThat(cheese, is(equalTo(smelly)))
*/
@Factory
public static <T> Matcher<T> is(Matcher<T> matcher) {
return new Is<T>(matcher);
}
/**
* This is a shortcut to the frequently used is(equalTo(x)).
*
* eg. assertThat(cheese, is(equalTo(smelly)))
* vs assertThat(cheese, is(smelly))
*/
@Factory
public static <T> Matcher<T> is(T value) {
return is(equalTo(value));
}
/**
* This is a shortcut to the frequently used is(instanceOf(SomeClass.class)).
*
* eg. assertThat(cheese, is(instanceOf(Cheddar.class)))
* vs assertThat(cheese, is(Cheddar.class))
*/
@Factory
public static Matcher<Object> is(Class<?> type) {
return is(instanceOf(type));
}
}
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