| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.json.internal; |
| 20 | |
| 21 | import java.lang.reflect.Method; |
| 22 | import java.lang.reflect.Type; |
| 23 | import java.util.concurrent.ExecutionException; |
| 24 | |
| 25 | import com.google.common.cache.Cache; |
| 26 | import com.google.common.cache.CacheBuilder; |
| 27 | import com.google.common.cache.CacheLoader; |
| 28 | import com.google.gson.JsonDeserializationContext; |
| 29 | import com.google.gson.JsonDeserializer; |
| 30 | import com.google.gson.JsonElement; |
| 31 | import com.google.gson.JsonParseException; |
| 32 | import com.google.gson.JsonPrimitive; |
| 33 | import com.google.gson.JsonSerializationContext; |
| 34 | import com.google.gson.JsonSerializer; |
| 35 | |
| 36 | /** |
| 37 | * @author Adrian Cole |
| 38 | */ |
| 39 | @SuppressWarnings("unchecked") |
| 40 | public class EnumTypeAdapterThatReturnsFromValue<T extends Enum<T>> implements JsonSerializer<T>, JsonDeserializer<T> { |
| 41 | public JsonElement serialize(T src, Type typeOfSrc, JsonSerializationContext context) { |
| 42 | return new JsonPrimitive(src.name()); |
| 43 | } |
| 44 | |
| 45 | @SuppressWarnings("cast") |
| 46 | public T deserialize(JsonElement json, Type classOfT, JsonDeserializationContext context) throws JsonParseException { |
| 47 | try { |
| 48 | return (T) Enum.valueOf((Class<T>) classOfT, json.getAsString()); |
| 49 | } catch (IllegalArgumentException e) { |
| 50 | try { |
| 51 | Method converter = classToConvert.get((Class<?>) classOfT); |
| 52 | return (T) converter.invoke(null, json.getAsString()); |
| 53 | } catch (Exception e1) { |
| 54 | throw e; |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | private final static Cache<Class<?>, Method> classToConvert = CacheBuilder.newBuilder() |
| 60 | .build(new CacheLoader<Class<?>, Method>() { |
| 61 | |
| 62 | @Override |
| 63 | public Method load(Class<?> from) throws ExecutionException { |
| 64 | try { |
| 65 | Method method = from.getMethod("fromValue", String.class); |
| 66 | method.setAccessible(true); |
| 67 | return method; |
| 68 | } catch (Exception e) { |
| 69 | throw new ExecutionException(e); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | }); |
| 74 | |
| 75 | @Override |
| 76 | public String toString() { |
| 77 | return EnumTypeAdapterThatReturnsFromValue.class.getSimpleName(); |
| 78 | } |
| 79 | } |