101 lines
3.4 KiB
Java
101 lines
3.4 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal;
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import java.lang.reflect.Type;
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/**
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* Contains static utility methods pertaining to primitive types and their corresponding wrapper
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* types.
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*
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* @author Kevin Bourrillion
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*/
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public final class Primitives {
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private Primitives() {}
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/** Returns true if this type is a primitive. */
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public static boolean isPrimitive(Type type) {
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return type instanceof Class<?> && ((Class<?>) type).isPrimitive();
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}
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/**
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* Returns {@code true} if {@code type} is one of the nine primitive-wrapper types, such as {@link
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* Integer}.
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*
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* @see Class#isPrimitive
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*/
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public static boolean isWrapperType(Type type) {
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return type == Integer.class
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|| type == Float.class
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|| type == Byte.class
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|| type == Double.class
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|| type == Long.class
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|| type == Character.class
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|| type == Boolean.class
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|| type == Short.class
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|| type == Void.class;
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}
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/**
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* Returns the corresponding wrapper type of {@code type} if it is a primitive type; otherwise
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* returns {@code type} itself. Idempotent.
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*
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* <pre>
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* wrap(int.class) == Integer.class
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* wrap(Integer.class) == Integer.class
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* wrap(String.class) == String.class
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* </pre>
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*/
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@SuppressWarnings({"unchecked", "MissingBraces"})
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public static <T> Class<T> wrap(Class<T> type) {
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if (type == int.class) return (Class<T>) Integer.class;
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if (type == float.class) return (Class<T>) Float.class;
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if (type == byte.class) return (Class<T>) Byte.class;
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if (type == double.class) return (Class<T>) Double.class;
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if (type == long.class) return (Class<T>) Long.class;
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if (type == char.class) return (Class<T>) Character.class;
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if (type == boolean.class) return (Class<T>) Boolean.class;
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if (type == short.class) return (Class<T>) Short.class;
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if (type == void.class) return (Class<T>) Void.class;
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return type;
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}
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/**
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* Returns the corresponding primitive type of {@code type} if it is a wrapper type; otherwise
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* returns {@code type} itself. Idempotent.
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*
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* <pre>
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* unwrap(Integer.class) == int.class
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* unwrap(int.class) == int.class
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* unwrap(String.class) == String.class
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* </pre>
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*/
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@SuppressWarnings({"unchecked", "MissingBraces"})
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public static <T> Class<T> unwrap(Class<T> type) {
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if (type == Integer.class) return (Class<T>) int.class;
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if (type == Float.class) return (Class<T>) float.class;
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if (type == Byte.class) return (Class<T>) byte.class;
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if (type == Double.class) return (Class<T>) double.class;
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if (type == Long.class) return (Class<T>) long.class;
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if (type == Character.class) return (Class<T>) char.class;
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if (type == Boolean.class) return (Class<T>) boolean.class;
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if (type == Short.class) return (Class<T>) short.class;
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if (type == Void.class) return (Class<T>) void.class;
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return type;
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}
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}
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