jna-master/contrib/platform/src/com/sun/jna/platform/EnumConverter.java
/*
 * Copyright 2014 Martin Steiger
 *
 * The contents of this file is dual-licensed under 2
 * alternative Open Source/Free licenses: LGPL 2.1 or later and
 * Apache License 2.0. (starting with JNA version 4.0.0).
 *
 * You can freely decide which license you want to apply to
 * the project.
 *
 * You may obtain a copy of the LGPL License at:
 *
 * http://www.gnu.org/licenses/licenses.html
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "LGPL2.1".
 *
 * You may obtain a copy of the Apache License at:
 *
 * http://www.apache.org/licenses/
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "AL2.0".
 */

package com.sun.jna.platform;

import com.sun.jna.FromNativeContext;
import com.sun.jna.ToNativeContext;
import com.sun.jna.TypeConverter;

/**
 * A {@link TypeConverter} that maps an integer enum value to
 * an actual Java enum.
 * @param <T> the enum type
 * @author Martin Steiger
 */
public class EnumConverter<T extends Enum<T>> implements TypeConverter {

    private final Class<T> clazz;

    /**
     * @param clazz the enum class
     */
    public EnumConverter(Class<T> clazz)
    {
        this.clazz = clazz;
    }

    @Override
    public T fromNative(Object input, FromNativeContext context) {
        Integer i = (Integer) input;

        T[] vals = clazz.getEnumConstants();
        return vals[i];
    }

    @Override
    public Integer toNative(Object input, ToNativeContext context) {
        T t = clazz.cast(input);

        return Integer.valueOf(t.ordinal());
    }

    @Override
    public Class<Integer> nativeType() {
        return Integer.class;
    }
}


