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Enums utilities.

There is a newer version: 0.9.0

package cdc.util.enums;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import cdc.util.lang.Introspection;

/**
 * Specialization of {@link AbstractSynthesisMask} to nullable enum values.
 * 
 * WARNING: The class can not be specialized.
 *
 * @author Damien Carbonne
 *
 * @param  The enum type.
 */
public final class NullableEnumSynthesisMask> extends AbstractSynthesisMask, E> {
    private static final Map>, SynthesisMaskSupport> MAP = new HashMap<>();

    private NullableEnumSynthesisMask(SynthesisMaskSupport, E> support,
                                      Map map) {
        super(support,
              map);
    }

    private static > SynthesisMaskSupport, E> newSupport(Class enumClass) {
        final Class> maskClass = Introspection.uncheckedCast(NullableEnumSynthesisMask.class);
        final Creator, E> creator = NullableEnumSynthesisMask::new;
        return support(maskClass,
                       creator,
                       enumClass,
                       Nullable.TRUE);
    }

    /**
     * Retrieves or creates the support associated to a class.
     *
     * @param  The enum type.
     * @param enumClass The enum class.
     * @return The support associated to {@code enumClass}.
     */
    public static > SynthesisMaskSupport, E> support(Class enumClass) {
        final SynthesisMaskSupport tmp;
        tmp = MAP.computeIfAbsent(enumClass, k -> newSupport(enumClass));

        @SuppressWarnings("unchecked")
        final SynthesisMaskSupport, E> result = (SynthesisMaskSupport, E>) tmp;
        return result;
    }

    /**
     * @return A set of all classes for which a support has been created.
     */
    public static Set>> getEnumClasses() {
        return MAP.keySet();
    }
}