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author | Tom Powell <zifnab@zifnab06.net> | 2015-10-08 21:40:00 -0700 |
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committer | Tom Powell <zifnab@zifnab06.net> | 2015-10-08 21:40:00 -0700 |
commit | 4bc2ec0628f74bc24c3820951f4ca2c91e516f7a (patch) | |
tree | 3b0061fa2a6be32d1fdab9a63495aacf2bdc705c /gson/src/main/java/com/google/gson/internal/Primitives.java | |
parent | ca8ca14e5e1904db81f4f68445b94040293d83e8 (diff) | |
parent | 5d414d68ea79cc01bdd574656099a08228b82aa2 (diff) | |
download | android_external_gson-4bc2ec0628f74bc24c3820951f4ca2c91e516f7a.tar.gz android_external_gson-4bc2ec0628f74bc24c3820951f4ca2c91e516f7a.tar.bz2 android_external_gson-4bc2ec0628f74bc24c3820951f4ca2c91e516f7a.zip |
Merge tag 'gson-2.4' into cm-13.0HEADreplicant-6.0-0004-transitionreplicant-6.0-0004-rc6replicant-6.0-0004-rc5-transitionreplicant-6.0-0004-rc5replicant-6.0-0004-rc4replicant-6.0-0004-rc3replicant-6.0-0004-rc2replicant-6.0-0004-rc1replicant-6.0-0004replicant-6.0-0003replicant-6.0-0002replicant-6.0-0001staging/lineage-15.1stable/cm-13.0-ZNH5Ystable/cm-13.0-ZNH2KBstable/cm-13.0-ZNH2Kstable/cm-13.0-ZNH0Ecm-14.1cm-14.0cm-13.0
[maven-release-plugin] copy for tag gson-2.4
Change-Id: Id89b6397c7e9152eaab6f4753826708330d7373c
Diffstat (limited to 'gson/src/main/java/com/google/gson/internal/Primitives.java')
-rw-r--r-- | gson/src/main/java/com/google/gson/internal/Primitives.java | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/gson/src/main/java/com/google/gson/internal/Primitives.java b/gson/src/main/java/com/google/gson/internal/Primitives.java new file mode 100644 index 00000000..a98f6242 --- /dev/null +++ b/gson/src/main/java/com/google/gson/internal/Primitives.java @@ -0,0 +1,119 @@ +/* + * 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; +import java.util.Collections; +import java.util.HashMap; +import java.util.Map; + +/** + * Contains static utility methods pertaining to primitive types and their + * corresponding wrapper types. + * + * @author Kevin Bourrillion + */ +public final class Primitives { + private Primitives() { + throw new UnsupportedOperationException(); + } + + /** A map from primitive types to their corresponding wrapper types. */ + private static final Map<Class<?>, Class<?>> PRIMITIVE_TO_WRAPPER_TYPE; + + /** A map from wrapper types to their corresponding primitive types. */ + private static final Map<Class<?>, Class<?>> WRAPPER_TO_PRIMITIVE_TYPE; + + // Sad that we can't use a BiMap. :( + + static { + Map<Class<?>, Class<?>> primToWrap = new HashMap<Class<?>, Class<?>>(16); + Map<Class<?>, Class<?>> wrapToPrim = new HashMap<Class<?>, Class<?>>(16); + + add(primToWrap, wrapToPrim, boolean.class, Boolean.class); + add(primToWrap, wrapToPrim, byte.class, Byte.class); + add(primToWrap, wrapToPrim, char.class, Character.class); + add(primToWrap, wrapToPrim, double.class, Double.class); + add(primToWrap, wrapToPrim, float.class, Float.class); + add(primToWrap, wrapToPrim, int.class, Integer.class); + add(primToWrap, wrapToPrim, long.class, Long.class); + add(primToWrap, wrapToPrim, short.class, Short.class); + add(primToWrap, wrapToPrim, void.class, Void.class); + + PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap); + WRAPPER_TO_PRIMITIVE_TYPE = Collections.unmodifiableMap(wrapToPrim); + } + + private static void add(Map<Class<?>, Class<?>> forward, + Map<Class<?>, Class<?>> backward, Class<?> key, Class<?> value) { + forward.put(key, value); + backward.put(value, key); + } + + /** + * Returns true if this type is a primitive. + */ + public static boolean isPrimitive(Type type) { + return PRIMITIVE_TO_WRAPPER_TYPE.containsKey(type); + } + + /** + * 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 WRAPPER_TO_PRIMITIVE_TYPE.containsKey( + $Gson$Preconditions.checkNotNull(type)); + } + + /** + * Returns the corresponding wrapper type of {@code type} if it is a primitive + * type; otherwise returns {@code type} itself. Idempotent. + * <pre> + * wrap(int.class) == Integer.class + * wrap(Integer.class) == Integer.class + * wrap(String.class) == String.class + * </pre> + */ + public static <T> Class<T> wrap(Class<T> type) { + // cast is safe: long.class and Long.class are both of type Class<Long> + @SuppressWarnings("unchecked") + Class<T> wrapped = (Class<T>) PRIMITIVE_TO_WRAPPER_TYPE.get( + $Gson$Preconditions.checkNotNull(type)); + return (wrapped == null) ? type : wrapped; + } + + /** + * Returns the corresponding primitive type of {@code type} if it is a + * wrapper type; otherwise returns {@code type} itself. Idempotent. + * <pre> + * unwrap(Integer.class) == int.class + * unwrap(int.class) == int.class + * unwrap(String.class) == String.class + * </pre> + */ + public static <T> Class<T> unwrap(Class<T> type) { + // cast is safe: long.class and Long.class are both of type Class<Long> + @SuppressWarnings("unchecked") + Class<T> unwrapped = (Class<T>) WRAPPER_TO_PRIMITIVE_TYPE.get( + $Gson$Preconditions.checkNotNull(type)); + return (unwrapped == null) ? type : unwrapped; + } +} |