下面列出了怎么用com.google.gson.annotations.JsonAdapter的API类实例代码及写法,或者点击链接到github查看源代码。
@SuppressWarnings("unchecked") // Casts guarded by conditionals.
static TypeAdapter<?> getTypeAdapter(ConstructorConstructor constructorConstructor, Gson gson,
TypeToken<?> fieldType, JsonAdapter annotation) {
Class<?> value = annotation.value();
if (TypeAdapter.class.isAssignableFrom(value)) {
Class<TypeAdapter<?>> typeAdapter = (Class<TypeAdapter<?>>) value;
return constructorConstructor.get(TypeToken.get(typeAdapter)).construct();
}
if (TypeAdapterFactory.class.isAssignableFrom(value)) {
Class<TypeAdapterFactory> typeAdapterFactory = (Class<TypeAdapterFactory>) value;
return constructorConstructor.get(TypeToken.get(typeAdapterFactory))
.construct()
.create(gson, fieldType);
}
throw new IllegalArgumentException(
"@JsonAdapter value must be TypeAdapter or TypeAdapterFactory reference.");
}
@SuppressWarnings("unchecked")
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> targetType) {
Class<? super T> rawType = targetType.getRawType();
JsonAdapter annotation = rawType.getAnnotation(JsonAdapter.class);
if (annotation == null) {
return null;
}
return (TypeAdapter<T>) getTypeAdapter(constructorConstructor, gson, targetType, annotation);
}
@SuppressWarnings({ "unchecked", "rawtypes" }) // Casts guarded by conditionals.
TypeAdapter<?> getTypeAdapter(ConstructorConstructor constructorConstructor, Gson gson,
TypeToken<?> type, JsonAdapter annotation) {
Object instance = constructorConstructor.get(TypeToken.get(annotation.value())).construct();
TypeAdapter<?> typeAdapter;
if (instance instanceof TypeAdapter) {
typeAdapter = (TypeAdapter<?>) instance;
} else if (instance instanceof TypeAdapterFactory) {
typeAdapter = ((TypeAdapterFactory) instance).create(gson, type);
} else if (instance instanceof JsonSerializer || instance instanceof JsonDeserializer) {
JsonSerializer<?> serializer = instance instanceof JsonSerializer
? (JsonSerializer) instance
: null;
JsonDeserializer<?> deserializer = instance instanceof JsonDeserializer
? (JsonDeserializer) instance
: null;
typeAdapter = new TreeTypeAdapter(serializer, deserializer, gson, type, null);
} else {
throw new IllegalArgumentException("Invalid attempt to bind an instance of "
+ instance.getClass().getName() + " as a @JsonAdapter for " + type.toString()
+ ". @JsonAdapter value must be a TypeAdapter, TypeAdapterFactory,"
+ " JsonSerializer or JsonDeserializer.");
}
if (typeAdapter != null && annotation.nullSafe()) {
typeAdapter = typeAdapter.nullSafe();
}
return typeAdapter;
}
@SuppressWarnings("unchecked")
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> targetType) {
JsonAdapter annotation = targetType.getRawType().getAnnotation(JsonAdapter.class);
if (annotation == null) {
return null;
}
return (TypeAdapter<T>) getTypeAdapter(constructorConstructor, gson, targetType, annotation);
}
private TypeAdapter<?> getFieldAdapter(Gson gson, Field field, TypeToken<?> fieldType) {
JsonAdapter annotation = field.getAnnotation(JsonAdapter.class);
if (annotation != null) {
TypeAdapter<?> adapter = getTypeAdapter(constructorConstructor, gson, fieldType, annotation);
if (adapter != null) return adapter;
}
return gson.getAdapter(fieldType);
}