com.google.gson.internal.Primitives Maven / Gradle / Ivy
/*
* 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;
}
}