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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;
/**
* 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;
}
@Override
public boolean matches(Object arg) {
return !matcher.matches(arg);
}
@Override
public void describeTo(Description description) {
description.appendText("not ").appendDescriptionOf(matcher);
}
/**
* Creates a matcher that wraps an existing matcher, but inverts the logic by which
* it will match.
* For example:
* <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>
*
* @param matcher
* the matcher whose sense should be inverted
*/
public static <T> Matcher<T> not(Matcher<T> matcher) {
return new IsNot<T>(matcher);
}
/**
* A shortcut to the frequently used <code>not(equalTo(x))</code>.
* For example:
* <pre>assertThat(cheese, is(not(smelly)))</pre>
* instead of:
* <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>
*
* @param value
* the value that any examined object should <b>not</b> equal
*/
public static <T> Matcher<T> not(T value) {
return not(equalTo(value));
}
}
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