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/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.util;

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

@SuppressWarnings("unchecked")
public final class Primitives {

    private static final Map, Class> PRIMITIVE_TYPES = new HashMap<>();
    private static final Map, Object> PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES =
            new HashMap<>();

    /**
     * Returns the primitive type of the given class.
     * 
     * The passed class can be any class : boolean.class, Integer.class
     * in witch case this method will return boolean.class, even SomeObject.class
     * in which case null will be returned.
     *
     * @param clazz The class from which primitive type has to be retrieved
     * @param    The type
     * @return The primitive type if relevant, otherwise null
     */
    public static  Class primitiveTypeOf(Class clazz) {
        if (clazz.isPrimitive()) {
            return clazz;
        }
        return (Class) PRIMITIVE_TYPES.get(clazz);
    }

    /**
     * Indicates if the given class is primitive type or a primitive wrapper.
     *
     * @param type The type to check
     * @return true if primitive or wrapper, false otherwise.
     */
    public static boolean isPrimitiveOrWrapper(Class type) {
        return PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.containsKey(type);
    }

    public static boolean isAssignableFromWrapper(Class valueClass, Class referenceType) {
        if (isPrimitiveOrWrapper(valueClass) && isPrimitiveOrWrapper(referenceType)) {
            return Primitives.primitiveTypeOf(valueClass)
                    .isAssignableFrom(Primitives.primitiveTypeOf(referenceType));
        }
        return false;
    }

    /**
     * Returns the boxed default value for a primitive or a primitive wrapper.
     *
     * @param primitiveOrWrapperType The type to lookup the default value
     * @return The boxed default values as defined in Java Language Specification,
     *         null if the type is neither a primitive nor a wrapper
     */
    public static  T defaultValue(Class primitiveOrWrapperType) {
        return (T) PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.get(primitiveOrWrapperType);
    }

    static {
        PRIMITIVE_TYPES.put(Boolean.class, Boolean.TYPE);
        PRIMITIVE_TYPES.put(Character.class, Character.TYPE);
        PRIMITIVE_TYPES.put(Byte.class, Byte.TYPE);
        PRIMITIVE_TYPES.put(Short.class, Short.TYPE);
        PRIMITIVE_TYPES.put(Integer.class, Integer.TYPE);
        PRIMITIVE_TYPES.put(Long.class, Long.TYPE);
        PRIMITIVE_TYPES.put(Float.class, Float.TYPE);
        PRIMITIVE_TYPES.put(Double.class, Double.TYPE);
    }

    static {
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Boolean.class, false);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Character.class, '\u0000');
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Byte.class, (byte) 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Short.class, (short) 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Integer.class, 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Long.class, 0L);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Float.class, 0F);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(Double.class, 0D);

        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(boolean.class, false);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(char.class, '\u0000');
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(byte.class, (byte) 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(short.class, (short) 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(int.class, 0);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(long.class, 0L);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(float.class, 0F);
        PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.put(double.class, 0D);
    }

    private Primitives() {}
}