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/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.gson.internal;

import java.lang.reflect.Type;

/**
 * Contains static utility methods pertaining to primitive types and their
 * corresponding wrapper types.
 *
 * @author Kevin Bourrillion
 */
public final class Primitives {
  private Primitives() {}

  /**
   * Returns true if this type is a primitive.
   */
  public static boolean isPrimitive(Type type) {
    return type instanceof Class && ((Class) type).isPrimitive();
  }

  /**
   * Returns {@code true} if {@code type} is one of the nine
   * primitive-wrapper types, such as {@link Integer}.
   *
   * @see Class#isPrimitive
   */
  public static boolean isWrapperType(Type type) {
    return type == Integer.class
        || type == Float.class
        || type == Byte.class
        || type == Double.class
        || type == Long.class
        || type == Character.class
        || type == Boolean.class
        || type == Short.class
        || type == Void.class;
  }

  /**
   * 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
   * 
   */
  @SuppressWarnings("unchecked")
  public static  Class wrap(Class type) {
    if (type == int.class) return (Class) Integer.class;
    if (type == float.class) return (Class) Float.class;
    if (type == byte.class) return (Class) Byte.class;
    if (type == double.class) return (Class) Double.class;
    if (type == long.class) return (Class) Long.class;
    if (type == char.class) return (Class) Character.class;
    if (type == boolean.class) return (Class) Boolean.class;
    if (type == short.class) return (Class) Short.class;
    if (type == void.class) return (Class) Void.class;
    return type;
  }

  /**
   * Returns the corresponding primitive type of {@code type} if it is a
   * wrapper type; otherwise returns {@code type} itself. Idempotent.
   *    *     unwrap(Integer.class) == int.class
   *     unwrap(int.class) == int.class
   *     unwrap(String.class) == String.class
   * 
   */
  @SuppressWarnings("unchecked")
  public static  Class unwrap(Class type) {
    if (type == Integer.class) return (Class) int.class;
    if (type == Float.class) return (Class) float.class;
    if (type == Byte.class) return (Class) byte.class;
    if (type == Double.class) return (Class) double.class;
    if (type == Long.class) return (Class) long.class;
    if (type == Character.class) return (Class) char.class;
    if (type == Boolean.class) return (Class) boolean.class;
    if (type == Short.class) return (Class) short.class;
    if (type == Void.class) return (Class) void.class;
    return type;
  }
}