public static String toJson(
Object target,
Type targetType,
boolean isSerializeNulls,
Double version,
String datePattern,
boolean excludesFieldsWithoutExpose) {
if (target == null) return EMPTY_JSON;
GsonBuilder builder = new GsonBuilder();
if (isSerializeNulls) builder.serializeNulls();
if (version != null) builder.setVersion(version.doubleValue());
if (TextUtils.isEmpty(datePattern)) datePattern = DEFAULT_DATE_PATTERN;
builder.setDateFormat(datePattern);
if (excludesFieldsWithoutExpose) builder.excludeFieldsWithoutExposeAnnotation();
String result = EMPTY;
Gson gson = builder.create();
try {
if (targetType != null) {
result = gson.toJson(target, targetType);
} else {
result = gson.toJson(target);
}
} catch (Exception ex) {
if (target instanceof Collection
|| target instanceof Iterator
|| target instanceof Enumeration
|| target.getClass().isArray()) {
result = EMPTY_JSON_ARRAY;
} else result = EMPTY_JSON;
}
return result;
}
public static void init() {
if (gson == null) {
GsonBuilder gsonB = new GsonBuilder();
gsonB
.excludeFieldsWithoutExposeAnnotation(); // only fields marked with @Expose will only be
// considered
gsonB.registerTypeAdapter(Exception.class, ExceptionTypeAdapter.FACTORY);
gsonB.registerTypeAdapter(UUID.class, UUIDTypeAdapter.FACTORY);
gsonB.registerTypeAdapter(
JsonRequest.class, JsonRequestDefaultToStringDataDeserializer.FACTORY);
gsonB.setDateFormat("d MMM yyyy"); // "1 Jan 2012" based on java.text.DateFormat
gson = gsonB.create();
}
}
@Provides
@Singleton
Gson provideGson() {
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.excludeFieldsWithoutExposeAnnotation();
// gsonBuilder.setExclusionStrategies(new ExclusionStrategy() {
// @Override
// public boolean shouldSkipField(FieldAttributes f) {
// return f.getDeclaredClass().equals(ModelAdapter.class);
// }
//
// @Override
// public boolean shouldSkipClass(Class<?> clazz) {
// return false;
// }
// });
gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
return gsonBuilder.create();
}
public static Gson withExpose() {
GsonBuilder builder = new GsonBuilder();
builder.excludeFieldsWithoutExposeAnnotation();
return builder.create();
}