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PSL Commons is a package of Java utility classes for well know frameworks/libraries: guava, apache commons, guice, jersey, spring ect.

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package com.github.moleksyuk.psl.commons.guava.functions.string;

import com.google.common.base.Function;

/**
 * Function that transforms each item of {@code Iterable}
 * into a upper case using {@link String#toUpperCase()}.
 *
 * @author Mykhailo Oleksiuk
 */
public final class ToUpperCase implements Function {

    @Override
    public String apply(String input) {
        return input == null ? null : input.toUpperCase();
    }
}