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/* Copyright (c) 2000-2006 hamcrest.org
*/
package org.hamcrest.core;
import static org.hamcrest.core.IsEqual.equalTo;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.Factory;
import org.hamcrest.BaseMatcher;
/**
* Calculates the logical negation of a matcher.
*/
public class IsNot<T> extends BaseMatcher<T> {
private final Matcher<T> matcher;
public IsNot(Matcher<T> matcher) {
this.matcher = matcher;
}
public boolean matches(Object arg) {
return !matcher.matches(arg);
}
public void describeTo(Description description) {
description.appendText("not ").appendDescriptionOf(matcher);
}
/**
* Inverts the rule.
*/
@Factory
public static <T> Matcher<T> not(Matcher<T> matcher) {
return new IsNot<T>(matcher);
}
/**
* This is a shortcut to the frequently used not(equalTo(x)).
*
* eg. assertThat(cheese, is(not(equalTo(smelly))))
* vs assertThat(cheese, is(not(smelly)))
*/
@Factory
public static <T> Matcher<T> not(T value) {
return not(equalTo(value));
}
}
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