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jMonkeyEngine is a 3-D game engine for adventurous Java developers

There is a newer version: 3.7.0-stable

package com.jme3.anim.util;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;


/**
 * This is a guava method used in {@link com.jme3.anim.tween.Tweens} class.
 * Maybe we should just add guava as a dependency in the engine...
 * //TODO do something about this.
 */
public class Primitives {

    /**
     * A map from primitive types to their corresponding wrapper types.
     */
    private static final Map, Class> PRIMITIVE_TO_WRAPPER_TYPE;

    static {
        Map, Class> primToWrap = new HashMap<>(16);

        primToWrap.put(boolean.class, Boolean.class);
        primToWrap.put(byte.class, Byte.class);
        primToWrap.put(char.class, Character.class);
        primToWrap.put(double.class, Double.class);
        primToWrap.put(float.class, Float.class);
        primToWrap.put(int.class, Integer.class);
        primToWrap.put(long.class, Long.class);
        primToWrap.put(short.class, Short.class);
        primToWrap.put(void.class, Void.class);

        PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
    }

    /**
     * A private constructor to inhibit instantiation of this class.
     */
    private Primitives() {
    }

    /**
     * Returns the corresponding wrapper type of {@code type} if it is a primitive type; otherwise
     * returns {@code type} itself. Idempotent.
     *
     *      *     wrap(int.class) == Integer.class
     *     wrap(Integer.class) == Integer.class
     *     wrap(String.class) == String.class
     * 
     *
     * @param  type
     * @param type the type to be boxed (not null)
     * @return the boxed type
     */
    public static  Class wrap(Class type) {
        if (type == null) {
            throw new IllegalArgumentException("type is null");
        }

        // cast is safe: long.class and Long.class are both of type Class
        @SuppressWarnings("unchecked")
        Class wrapped = (Class) PRIMITIVE_TO_WRAPPER_TYPE.get(type);
        return (wrapped == null) ? type : wrapped;
    }
}