com.balajeetm.mystique.core.mvc.GsonDeserialiser Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) Balajee TM 2016.
 * All rights reserved.
 * License -  @see 
 */

/*
 * Created on 9 Oct, 2016 by balajeetm
 */
package com.balajeetm.mystique.core.mvc;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map.Entry;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.balajeetm.mystique.util.gson.bean.convertor.GsonConvertor;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.NumericNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TextNode;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;

/**
 * The Class GsonDeserialiser.
 *
 * @author balajeetm
 * @param  the generic type
 */
@Component
public class GsonDeserialiser extends StdDeserializer {

	/** The gson convertor. */
	@Autowired
	GsonConvertor gsonConvertor;

	/** The Constant serialVersionUID. */
	private static final long serialVersionUID = 1L;

	/**
	 * Instantiates a new gson deserialiser.
	 */
	public GsonDeserialiser() {
		this(JsonElement.class);
	}

	/**
	 * Instantiates a new gson deserialiser.
	 *
	 * @param vc the vc
	 */
	public GsonDeserialiser(Class vc) {
		super(vc);
	}

	/* (non-Javadoc)
	 * @see com.fasterxml.jackson.databind.JsonDeserializer#deserialize(com.fasterxml.jackson.core.JsonParser, com.fasterxml.jackson.databind.DeserializationContext)
	 */
	@Override
	public T deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
		JsonNode node = p.getCodec().readTree(p);
		return deserialize(node);
	}

	/**
	 * Deserialize.
	 *
	 * @param node the node
	 * @return the json element
	 */
	@SuppressWarnings("unchecked")
	private T deserialize(JsonNode node) {
		JsonElement result = JsonNull.INSTANCE;
		if (null != node && !node.isNull()) {
			if (node.isObject()) {
				ObjectNode onode = (ObjectNode) node;
				JsonObject jsonObject = new JsonObject();
				Iterator> fields = onode.fields();
				while (fields.hasNext()) {
					Entry next = fields.next();
					jsonObject.add(next.getKey(), deserialize(next.getValue()));
				}
				result = jsonObject;
			}
			else if (node.isArray()) {
				ArrayNode anode = (ArrayNode) node;
				JsonArray jsonArray = new JsonArray();
				Iterator elements = anode.elements();
				while (elements.hasNext()) {
					jsonArray.add(deserialize(elements.next()));
				}
				result = jsonArray;
			}
			else if (node.isBoolean()) {
				result = new JsonPrimitive(node.asBoolean());
			}
			else if (node.isNumber()) {
				NumericNode nnode = (NumericNode) node;
				result = new JsonPrimitive(nnode.numberValue());
			}
			else if (node.isTextual()) {
				TextNode tnode = (TextNode) node;
				result = new JsonPrimitive(tnode.textValue());
			}
		}

		return (T) result;
	}

}