178 lines
5.8 KiB
Java
178 lines
5.8 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import com.google.gson.internal.$Gson$Types;
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import com.google.gson.internal.Primitives;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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/**
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* This class contains some test fixtures for Parameterized types. These classes should ideally
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* belong either in the common or functional package, but they are placed here because they need
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* access to package protected elements of com.google.gson.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public class ParameterizedTypeFixtures {
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public static class MyParameterizedType<T> {
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public final T value;
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public MyParameterizedType(T value) {
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this.value = value;
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}
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public T getValue() {
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return value;
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}
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public String getExpectedJson() {
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String valueAsJson = getExpectedJson(value);
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return String.format("{\"value\":%s}", valueAsJson);
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}
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private String getExpectedJson(Object obj) {
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Class<?> clazz = obj.getClass();
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if (Primitives.isWrapperType(Primitives.wrap(clazz))) {
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return obj.toString();
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} else if (obj.getClass().equals(String.class)) {
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return "\"" + obj.toString() + "\"";
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} else {
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// Try invoking a getExpectedJson() method if it exists
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try {
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Method method = clazz.getMethod("getExpectedJson");
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Object results = method.invoke(obj);
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return (String) results;
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} catch (SecurityException e) {
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throw new RuntimeException(e);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException(e);
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} catch (IllegalArgumentException e) {
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throw new RuntimeException(e);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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} catch (InvocationTargetException e) {
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throw new RuntimeException(e);
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}
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}
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}
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@Override
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public int hashCode() {
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return value == null ? 0 : value.hashCode();
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}
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@SuppressWarnings("unchecked")
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null) {
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return false;
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}
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if (getClass() != obj.getClass()) {
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return false;
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}
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MyParameterizedType<T> other = (MyParameterizedType<T>) obj;
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if (value == null) {
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if (other.value != null) {
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return false;
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}
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} else if (!value.equals(other.value)) {
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return false;
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}
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return true;
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}
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}
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public static class MyParameterizedTypeInstanceCreator<T>
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implements InstanceCreator<MyParameterizedType<T>>{
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private final T instanceOfT;
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/**
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* Caution the specified instance is reused by the instance creator for each call.
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* This means that the fields of the same objects will be overwritten by Gson.
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* This is usually fine in tests since there we deserialize just once, but quite
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* dangerous in practice.
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*
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* @param instanceOfT
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*/
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public MyParameterizedTypeInstanceCreator(T instanceOfT) {
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this.instanceOfT = instanceOfT;
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}
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@Override public MyParameterizedType<T> createInstance(Type type) {
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return new MyParameterizedType<>(instanceOfT);
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}
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}
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public static final class MyParameterizedTypeAdapter<T>
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implements JsonSerializer<MyParameterizedType<T>>, JsonDeserializer<MyParameterizedType<T>> {
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@SuppressWarnings("unchecked")
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public static<T> String getExpectedJson(MyParameterizedType<T> obj) {
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Class<T> clazz = (Class<T>) obj.value.getClass();
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boolean addQuotes = !clazz.isArray() && !Primitives.unwrap(clazz).isPrimitive();
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StringBuilder sb = new StringBuilder("{\"");
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sb.append(obj.value.getClass().getSimpleName()).append("\":");
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if (addQuotes) {
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sb.append("\"");
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}
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sb.append(obj.value.toString());
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if (addQuotes) {
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sb.append("\"");
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}
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sb.append("}");
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return sb.toString();
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}
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@Override public JsonElement serialize(MyParameterizedType<T> src, Type classOfSrc,
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JsonSerializationContext context) {
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JsonObject json = new JsonObject();
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T value = src.getValue();
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json.add(value.getClass().getSimpleName(), context.serialize(value));
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return json;
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}
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@SuppressWarnings("unchecked")
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@Override public MyParameterizedType<T> deserialize(JsonElement json, Type typeOfT,
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JsonDeserializationContext context) throws JsonParseException {
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Type genericClass = ((ParameterizedType) typeOfT).getActualTypeArguments()[0];
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Class<?> rawType = $Gson$Types.getRawType(genericClass);
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String className = rawType.getSimpleName();
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JsonElement jsonElement = json.getAsJsonObject().get(className);
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T value;
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if (genericClass == Integer.class) {
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value = (T) Integer.valueOf(jsonElement.getAsInt());
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} else if (genericClass == String.class) {
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value = (T) jsonElement.getAsString();
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} else {
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value = (T) jsonElement;
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}
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if (Primitives.isPrimitive(genericClass)) {
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PrimitiveTypeAdapter typeAdapter = new PrimitiveTypeAdapter();
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value = (T) typeAdapter.adaptType(value, rawType);
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}
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return new MyParameterizedType<>(value);
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}
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}
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}
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