Refactor primitives class
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@ -16,11 +16,7 @@
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package com.google.gson.internal;
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import java.lang.reflect.Type;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Contains static utility methods pertaining to primitive types and their
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@ -29,47 +25,13 @@ import java.util.Map;
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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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throw new UnsupportedOperationException();
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}
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/** A map from primitive types to their corresponding wrapper types. */
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private static final Map<Class<?>, Class<?>> PRIMITIVE_TO_WRAPPER_TYPE;
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/** A map from wrapper types to their corresponding primitive types. */
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private static final Map<Class<?>, Class<?>> WRAPPER_TO_PRIMITIVE_TYPE;
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// Sad that we can't use a BiMap. :(
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static {
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Map<Class<?>, Class<?>> primToWrap = new HashMap<Class<?>, Class<?>>(16);
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Map<Class<?>, Class<?>> wrapToPrim = new HashMap<Class<?>, Class<?>>(16);
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add(primToWrap, wrapToPrim, boolean.class, Boolean.class);
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add(primToWrap, wrapToPrim, byte.class, Byte.class);
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add(primToWrap, wrapToPrim, char.class, Character.class);
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add(primToWrap, wrapToPrim, double.class, Double.class);
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add(primToWrap, wrapToPrim, float.class, Float.class);
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add(primToWrap, wrapToPrim, int.class, Integer.class);
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add(primToWrap, wrapToPrim, long.class, Long.class);
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add(primToWrap, wrapToPrim, short.class, Short.class);
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add(primToWrap, wrapToPrim, void.class, Void.class);
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PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
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WRAPPER_TO_PRIMITIVE_TYPE = Collections.unmodifiableMap(wrapToPrim);
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}
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private static void add(Map<Class<?>, Class<?>> forward,
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Map<Class<?>, Class<?>> backward, Class<?> key, Class<?> value) {
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forward.put(key, value);
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backward.put(value, key);
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}
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private Primitives() {}
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/**
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* Returns true if this type is a primitive.
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*/
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public static boolean isPrimitive(Type type) {
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return PRIMITIVE_TO_WRAPPER_TYPE.containsKey(type);
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return type instanceof Class<?> && ((Class<?>) type).isPrimitive();
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}
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/**
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@ -79,8 +41,15 @@ public final class Primitives {
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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 WRAPPER_TO_PRIMITIVE_TYPE.containsKey(
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$Gson$Preconditions.checkNotNull(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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@ -92,12 +61,18 @@ public final class Primitives {
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* wrap(String.class) == String.class
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* </pre>
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*/
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@SuppressWarnings("unchecked")
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public static <T> Class<T> wrap(Class<T> type) {
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// cast is safe: long.class and Long.class are both of type Class<Long>
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@SuppressWarnings("unchecked")
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Class<T> wrapped = (Class<T>) PRIMITIVE_TO_WRAPPER_TYPE.get(
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$Gson$Preconditions.checkNotNull(type));
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return (wrapped == null) ? type : wrapped;
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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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@ -109,11 +84,17 @@ public final class Primitives {
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* unwrap(String.class) == String.class
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* </pre>
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*/
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@SuppressWarnings("unchecked")
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public static <T> Class<T> unwrap(Class<T> type) {
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// cast is safe: long.class and Long.class are both of type Class<Long>
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@SuppressWarnings("unchecked")
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Class<T> unwrapped = (Class<T>) WRAPPER_TO_PRIMITIVE_TYPE.get(
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$Gson$Preconditions.checkNotNull(type));
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return (unwrapped == null) ? type : unwrapped;
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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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