| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * 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, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.json.internal; |
| 20 | |
| 21 | import java.lang.reflect.Method; |
| 22 | import java.lang.reflect.Type; |
| 23 | import java.util.Map; |
| 24 | |
| 25 | import com.google.common.base.Function; |
| 26 | import com.google.common.collect.MapMaker; |
| 27 | import com.google.gson.JsonDeserializationContext; |
| 28 | import com.google.gson.JsonDeserializer; |
| 29 | import com.google.gson.JsonElement; |
| 30 | import com.google.gson.JsonParseException; |
| 31 | import com.google.gson.JsonPrimitive; |
| 32 | import com.google.gson.JsonSerializationContext; |
| 33 | import com.google.gson.JsonSerializer; |
| 34 | |
| 35 | /** |
| 36 | * @author Adrian Cole |
| 37 | */ |
| 38 | @SuppressWarnings("unchecked") |
| 39 | public class EnumTypeAdapterThatReturnsFromValue<T extends Enum<T>> implements JsonSerializer<T>, JsonDeserializer<T> { |
| 40 | public JsonElement serialize(T src, Type typeOfSrc, JsonSerializationContext context) { |
| 41 | return new JsonPrimitive(src.name()); |
| 42 | } |
| 43 | |
| 44 | @SuppressWarnings("cast") |
| 45 | public T deserialize(JsonElement json, Type classOfT, JsonDeserializationContext context) throws JsonParseException { |
| 46 | try { |
| 47 | return (T) Enum.valueOf((Class<T>) classOfT, json.getAsString()); |
| 48 | } catch (IllegalArgumentException e) { |
| 49 | Method converter = classToConvert.get(classOfT); |
| 50 | if (converter != null) |
| 51 | try { |
| 52 | return (T) converter.invoke(null, json.getAsString()); |
| 53 | } catch (Exception e1) { |
| 54 | throw e; |
| 55 | } |
| 56 | else |
| 57 | throw e; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | private final static Map<Class<?>, Method> classToConvert = new MapMaker() |
| 62 | .makeComputingMap(new Function<Class<?>, Method>() { |
| 63 | |
| 64 | @Override |
| 65 | public Method apply(Class<?> from) { |
| 66 | try { |
| 67 | Method method = from.getMethod("fromValue", String.class); |
| 68 | method.setAccessible(true); |
| 69 | return method; |
| 70 | } catch (Exception e) { |
| 71 | return null; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | }); |
| 76 | |
| 77 | @Override |
| 78 | public String toString() { |
| 79 | return EnumTypeAdapterThatReturnsFromValue.class.getSimpleName(); |
| 80 | } |
| 81 | } |