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[Java] Reduce guava TypeToken dependency
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135 changes: 135 additions & 0 deletions
135
java/fury-core/src/main/java/org/apache/fury/reflect/Primitives.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
|
|
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| package org.apache.fury.reflect; | ||
|
|
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| import java.util.Collections; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
|
|
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| /** | ||
| * Contains static utility methods pertaining to primitive types and their corresponding wrapper | ||
| * types. | ||
| */ | ||
| public final class Primitives { | ||
| private Primitives() {} | ||
|
|
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| /** A map from primitive types to their corresponding wrapper types. */ | ||
| private static final Map<Class<?>, Class<?>> PRIMITIVE_TO_WRAPPER_TYPE; | ||
|
|
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| /** A map from wrapper types to their corresponding primitive types. */ | ||
| 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 { | ||
| final Map<Class<?>, Class<?>> primToWrap = new LinkedHashMap<>(16); | ||
| final Map<Class<?>, Class<?>> wrapToPrim = new LinkedHashMap<>(16); | ||
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|
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| 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); | ||
|
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| PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap); | ||
| WRAPPER_TO_PRIMITIVE_TYPE = Collections.unmodifiableMap(wrapToPrim); | ||
| } | ||
|
|
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| private static void add( | ||
| Map<Class<?>, Class<?>> forward, | ||
| Map<Class<?>, Class<?>> backward, | ||
| Class<?> key, | ||
| Class<?> value) { | ||
| forward.put(key, value); | ||
| backward.put(value, key); | ||
| } | ||
|
|
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| /** | ||
| * Returns an immutable set of all nine primitive types (including {@code void}). Note that a | ||
| * simpler way to test whether a {@code Class} instance is a member of this set is to call {@link | ||
| * Class#isPrimitive}. | ||
| */ | ||
| public static Set<Class<?>> allPrimitiveTypes() { | ||
| return PRIMITIVE_TO_WRAPPER_TYPE.keySet(); | ||
| } | ||
|
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| /** Returns an immutable set of all nine primitive-wrapper types (including {@link Void}). */ | ||
| public static Set<Class<?>> allWrapperTypes() { | ||
| return WRAPPER_TO_PRIMITIVE_TYPE.keySet(); | ||
| } | ||
|
|
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| /** | ||
| * 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(Class<?> type) { | ||
| if (type == null) { | ||
| throw new NullPointerException(); | ||
| } | ||
| return WRAPPER_TO_PRIMITIVE_TYPE.containsKey(type); | ||
| } | ||
|
|
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| /** | ||
| * 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) { | ||
| if (type == null) { | ||
| throw new NullPointerException(); | ||
| } | ||
| // cast is safe: long.class and Long.class are both of type Class<Long> | ||
| @SuppressWarnings("unchecked") | ||
| final Class<T> wrapped = (Class<T>) PRIMITIVE_TO_WRAPPER_TYPE.get(type); | ||
| return (wrapped == null) ? type : wrapped; | ||
| } | ||
|
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| /** | ||
| * 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) { | ||
| if (type == null) { | ||
| throw new NullPointerException(); | ||
| } | ||
| // cast is safe: long.class and Long.class are both of type Class<Long> | ||
| @SuppressWarnings("unchecked") | ||
| final Class<T> unwrapped = (Class<T>) WRAPPER_TO_PRIMITIVE_TYPE.get(type); | ||
| return (unwrapped == null) ? type : unwrapped; | ||
| } | ||
| } |
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