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Finds unused classes of a project

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package de.is24.guava;

import javax.annotation.Nonnull;

/**
 * A NonNullFunction basically is a {@link com.google.common.base.Function} that
 * neither accepts null nor is it allowed to return null.
 *
 * @since 2.0.0
 */
public interface NonNullFunction {

    /**
     * Returns the result of applying this function to the given input.
     *
     * @since 2.0.0
     */
    @Nonnull
    T apply(@Nonnull F input);

}