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FeatureMatcher factory method for java 8 users #203

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FeatureMatcher factory method for java 8 users #203

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14 changes: 14 additions & 0 deletions hamcrest-core/src/main/java/org/hamcrest/FeatureMatcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -51,4 +51,18 @@ public final void describeTo(Description description) {
description.appendText(featureDescription).appendText(" ")
.appendDescriptionOf(subMatcher);
}

public static <T, U> FeatureMatcher<T, U> ofFunction(final Mapper<T, U> mapper, Matcher<? super U> matcher, String featureDescription, String featureName) {
return new FeatureMatcher<T, U>(matcher, featureDescription, featureName) {
@Override
protected U featureValueOf(T actual) {
return mapper.map(actual);
}
};
}

// TODO java 8 @FunctionalInterface
public interface Mapper<T, U> {
U map(T t);
}
}