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EasyPost Java Client Library for the EasyPost Shipping API
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package com.easypost.model;

import com.easypost.net.EasyPostResource;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;

import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class EventDeserializer implements JsonDeserializer {

    @SuppressWarnings ("rawtypes")
    private static final Map OBJECT_MAP = new HashMap();

    static {
        OBJECT_MAP.put("Address", Address.class);
        OBJECT_MAP.put("Batch", Batch.class);
        OBJECT_MAP.put("CustomsInfo", CustomsInfo.class);
        OBJECT_MAP.put("CustomsItem", CustomsItem.class);
        OBJECT_MAP.put("Event", Event.class);
        OBJECT_MAP.put("Fee", Fee.class);
        OBJECT_MAP.put("Parcel", Parcel.class);
        OBJECT_MAP.put("PostageLabel", PostageLabel.class);
        OBJECT_MAP.put("Rate", Rate.class);
        OBJECT_MAP.put("Refund", Refund.class);
        OBJECT_MAP.put("ScanForm", ScanForm.class);
        OBJECT_MAP.put("Shipment", Shipment.class);
        OBJECT_MAP.put("TimeInTransit", TimeInTransit.class);
        OBJECT_MAP.put("Tracker", Tracker.class);
        OBJECT_MAP.put("TrackingDetail", TrackingDetail.class);
        OBJECT_MAP.put("Webhook", Webhook.class);
    }

    /**
     * Deserialize a JSON primitive into a Java object.
     *
     * @param element The JSON primitive to deserialize.
     * @return The deserialized Java object.
     */
    private Object deserializeJsonPrimitive(final JsonPrimitive element) {
        if (element.isBoolean()) {
            return element.getAsBoolean();
        } else if (element.isNumber()) {
            return element.getAsNumber();
        } else {
            return element.getAsString();
        }
    }

    /**
     * Deserialize a JSON array into a Java object.
     *
     * @param arr The JSON array to deserialize.
     * @return The deserialized Java object.
     */
    private Object[] deserializeJsonArray(final JsonArray arr) {
        Object[] elems = new Object[arr.size()];
        Iterator elemIter = arr.iterator();
        int i = 0;
        while (elemIter.hasNext()) {
            JsonElement elem = elemIter.next();
            elems[i++] = deserializeJsonElement(elem);
        }
        return elems;
    }

    /**
     * Deserialize a JSON object into a Java object.
     *
     * @param element The JSON object to deserialize.
     * @return The deserialized Java object.
     */
    private Object deserializeJsonElement(final JsonElement element) {
        if (element.isJsonNull()) {
            return null;
        } else if (element.isJsonObject()) {
            Map valueMap = new HashMap();
            populateMapFromJSONObject(valueMap, element.getAsJsonObject());
            return valueMap;
        } else if (element.isJsonPrimitive()) {
            return deserializeJsonPrimitive(element.getAsJsonPrimitive());
        } else if (element.isJsonArray()) {
            return deserializeJsonArray(element.getAsJsonArray());
        } else {
            System.err.printf("Unknown JSON element type for element %s. Please email us at %s.%n", element,
                    EasyPostResource.EASYPOST_SUPPORT_EMAIL);
            return null;
        }
    }

    /**
     * Populate a map from a JSON object.
     *
     * @param objMap     The map to populate.
     * @param jsonObject The JSON object to populate the map from.
     */
    private void populateMapFromJSONObject(final Map objMap, final JsonObject jsonObject) {
        for (Map.Entry entry : jsonObject.entrySet()) {
            String key = entry.getKey();
            JsonElement element = entry.getValue();
            objMap.put(key, deserializeJsonElement(element));
        }
    }

    /**
     * Deserialize a JSON object into a Java object.
     *
     * @param json    The JSON object to deserialize.
     * @param typeOfT The type of the Java object to deserialize into.
     * @param context The deserialization context.
     * @return The deserialized Java object.
     * @throws JsonParseException if the JSON object is not a valid Event.
     */
    @SuppressWarnings ("unchecked")
    public Event deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
            throws JsonParseException {
        Event event = new Event();

        JsonObject jsonObject = json.getAsJsonObject();
        for (Map.Entry entry : jsonObject.entrySet()) {
            String key = entry.getKey();
            JsonElement element = entry.getValue();
            if ("previous_attributes".equals(key) && !element.isJsonNull()) {
                Map previousAttributes = new HashMap();
                populateMapFromJSONObject(previousAttributes, element.getAsJsonObject());
                event.setPreviousAttributes(previousAttributes);
            } else if ("result".equals(key)) {
                String type = element.getAsJsonObject().get("object").getAsString();
                Class cl = OBJECT_MAP.get(type);
                EasyPostResource result = EasyPostResource.GSON.fromJson(entry.getValue(), cl);
                event.setResult(result);
            }
        }
        event.setId(jsonObject.get("id").getAsString());
        event.setDescription(jsonObject.get("description").getAsString());
        event.setMode(jsonObject.get("mode").getAsString());

        return event;
    }
}