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This is the full Active Objects library, if you don't know which one to use, you probably want this one.

There is a newer version: 6.1.1

package net.java.ao.schema;

import java.util.Locale;

public enum Case {
    UPPER {
        @Override
        public String apply(String s) {
            return nullSafe(s).toUpperCase(Locale.ENGLISH);
        }
    },
    LOWER {
        @Override
        public String apply(String s) {
            return nullSafe(s).toLowerCase(Locale.ENGLISH);
        }
    };

    public abstract String apply(String tableName);

    private static String nullSafe(String s) {
        return s != null ? s : "";
    }
}