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Json Utility to transform Jsons
/*
* Copyright (c) Balajee TM 2016.
* All rights reserved.
* License - @see
*/
/*
* Created on 25 Aug, 2016 by balajeetm
*/
package com.futuresight.util.mystique.lever;
import static com.google.gson.internal.$Gson$Preconditions.checkArgument;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.xml.datatype.XMLGregorianCalendar;
import lombok.Getter;
import org.apache.commons.lang.ArrayUtils;
import org.springframework.stereotype.Component;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
/**
* The Class GsonConvertor.
*
* @author balajeetm
*/
@Component
public class GsonConvertor implements JsonConvertor {
/** The gson. */
/**
* Gets the gson.
*
* @return the gson
*/
/**
* Gets the gson.
*
* @return the gson
*/
@Getter
private Gson gson;
/**
* Gets the gson builder.
*
* @return the gson builder
*/
/**
* Gets the gson builder.
*
* @return the gson builder
*/
@Getter
private GsonBuilder gsonBuilder;
/**
* Instantiates a new gson jackson convertor.
*/
private GsonConvertor() {
gsonBuilder = new GsonBuilder();
gsonBuilder.setDateFormat(DateFormat.LONG, DateFormat.LONG);
gsonBuilder.registerTypeAdapter(Date.class, new JsonDeserializer() {
@Override
public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
Date date = null;
if (null != json && json.isJsonPrimitive()) {
date = new Date(json.getAsJsonPrimitive().getAsLong());
}
return date;
}
});
gsonBuilder.registerTypeAdapter(XMLGregorianCalendar.class, new JsonSerializer() {
@Override
public JsonElement serialize(XMLGregorianCalendar src, Type typeOfSrc, JsonSerializationContext context) {
Date date = null;
if (null != src) {
date = src.toGregorianCalendar().getTime();
}
return new JsonPrimitive(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").format(date));
}
});
updateGson();
}
/**
* Inits the.
*/
@PostConstruct
protected void init() {
Creator.INSTANCE = this;
}
/**
* Update gson.
*/
public void updateGson() {
gson = gsonBuilder.create();
}
/**
* Register type adapter.
*
* @param adapters the adapters
*/
public void registerTypeAdapter(GsonTypeAdapter... adapters) {
if (!ArrayUtils.isEmpty(adapters)) {
for (GsonTypeAdapter gsonTypeAdapter : adapters) {
gsonBuilder.registerTypeAdapter(gsonTypeAdapter.getType(), gsonTypeAdapter.getAdapter());
}
updateGson();
}
}
/**
* Gets the single instance of JsonJacksonConvertor.
*
* @return single instance of JsonJacksonConvertor
*/
public static JsonConvertor getInstance() {
return Creator.INSTANCE;
}
// Efficient Thread safe Lazy Initialization
// works only if the singleton constructor is non parameterized
/**
* The Class Creator.
*/
private static class Creator {
/** The instance. */
public static JsonConvertor INSTANCE = new GsonConvertor();
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserialize(java.lang.String, java.lang.Class)
*/
@Override
public T deserialize(String objectString, Class objectType) throws ConvertorException {
try {
return gson.fromJson(objectString, objectType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserialize(java.lang.Object, java.lang.Class)
*/
@Override
public T deserialize(Object object, Class objectType) throws ConvertorException {
try {
JsonElement jsonElement = getJsonElement(object);
return gson.fromJson(jsonElement, objectType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserialize(java.io.InputStream, java.lang.Class)
*/
@Override
public T deserialize(InputStream inputStream, Class objectType) throws ConvertorException {
try {
return gson.fromJson(new InputStreamReader(inputStream), objectType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#serialize(java.lang.Object)
*/
@Override
public String serialize(Object value) throws ConvertorException {
try {
return gson.toJson(value);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserializeGroup(java.lang.String, java.lang.Class, java.lang.Class)
*/
@Override
public T deserializeGroup(String objectString, Class groupClass, Class elementClass)
throws ConvertorException {
try {
checkArgument(groupClass != null && elementClass != null);
GsonParametrizedType parametrizedType = new GsonParametrizedType(groupClass.getName(),
elementClass.getName());
return gson.fromJson(objectString, parametrizedType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserializeGroup(java.io.InputStream, java.lang.Class, java.lang.Class)
*/
@Override
public T deserializeGroup(InputStream inputStream, Class groupClass, Class elementClass)
throws ConvertorException {
try {
checkArgument(groupClass != null && elementClass != null);
GsonParametrizedType parametrizedType = new GsonParametrizedType(groupClass.getName(),
elementClass.getName());
return gson.fromJson(new InputStreamReader(inputStream), parametrizedType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserializeList(java.io.InputStream, java.lang.Class)
*/
@Override
public List deserializeList(InputStream inputStream, Class elementClass) throws ConvertorException {
try {
checkArgument(elementClass != null);
GsonParametrizedType parametrizedType = new GsonParametrizedType(List.class.getName(),
elementClass.getName());
return gson.fromJson(new InputStreamReader(inputStream), parametrizedType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserializeList(java.lang.String, java.lang.Class)
*/
@Override
public List deserializeList(String jsonString, Class elementClass) throws ConvertorException {
try {
checkArgument(elementClass != null);
GsonParametrizedType parametrizedType = new GsonParametrizedType(List.class.getName(),
elementClass.getName());
return gson.fromJson(jsonString, parametrizedType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/* (non-Javadoc)
* @see com.futuresight.util.mystique.lever.ConvertorInterface#deserializeList(java.lang.Object, java.lang.Class)
*/
@Override
public List deserializeList(Object object, Class elementClass) throws ConvertorException {
try {
checkArgument(elementClass != null);
JsonElement jsonElement = getJsonElement(object);
GsonParametrizedType parametrizedType = new GsonParametrizedType(List.class.getName(),
elementClass.getName());
return gson.fromJson(jsonElement, parametrizedType);
}
catch (Exception e) {
throw getConvertorException(e);
}
}
/**
* Gets the convertor exception.
*
* @param e the e
* @return the convertor exception
*/
private ConvertorException getConvertorException(Exception e) {
return new ConvertorException(e);
}
/**
* Gets the json element.
*
* @param obj the obj
* @return the json element
*/
private JsonElement getJsonElement(Object obj) {
return (obj instanceof JsonElement) ? (JsonElement) obj : gson.toJsonTree(obj);
}
}