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The ultimate Java library for building Chatbots on the Facebook Messenger Platform
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package com.github.messenger4j.internal.gson;


import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.time.Instant;
import java.util.Optional;

/**
 * @author Max Grabenhorst
 * @since 1.0.0
 */
public final class GsonUtil {

    private GsonUtil() {
    }

    private static Optional getProperty(JsonObject jsonObject, Constants... propertyPath) {
        JsonObject internalValue = jsonObject;
        for (int i = 0; i <= propertyPath.length - 2; i++) {
            final JsonElement property = internalValue.get(propertyPath[i].value());
            if (property == null || !property.isJsonObject()) {
                return Optional.empty();
            }
            internalValue = property.getAsJsonObject();
        }
        final JsonElement property = internalValue.get(propertyPath[propertyPath.length - 1].value());
        return property == null || property.isJsonNull() ? Optional.empty() : Optional.of(property);
    }

    public static boolean hasProperty(JsonObject jsonObject, Constants... propertyPath) {
        return getProperty(jsonObject, propertyPath).isPresent();
    }

    public static Optional getPropertyAsString(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsString);
    }

    public static Optional getPropertyAsBoolean(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsBoolean);
    }

    public static Optional getPropertyAsInt(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsInt);
    }

    public static Optional getPropertyAsLong(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsLong);
    }

    public static Optional getPropertyAsInstant(JsonObject jsonObject, Constants... propertyPath) {
        final Optional longValue = getPropertyAsLong(jsonObject, propertyPath);
        return longValue.map(Instant::ofEpochMilli);
    }

    public static Optional getPropertyAsDouble(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsDouble);
    }

    public static Optional getPropertyAsFloat(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsFloat);
    }

    public static Optional getPropertyAsJsonArray(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsJsonArray);
    }

    public static Optional getPropertyAsJsonObject(JsonObject jsonObject, Constants... propertyPath) {
        final Optional jsonElement = getProperty(jsonObject, propertyPath);
        return jsonElement.map(JsonElement::getAsJsonObject);
    }

    /**
     * @author Max Grabenhorst
     * @since 1.0.0
     */
    public enum Constants {

        PROP_OBJECT("object"),
        PROP_ENTRY("entry"),
        PROP_MESSAGING("messaging"),
        PROP_SENDER("sender"),
        PROP_RECIPIENT("recipient"),
        PROP_ID("id"),
        PROP_TIMESTAMP("timestamp"),
        PROP_OPTIN("optin"),
        PROP_MESSAGE("message"),
        PROP_MID("mid"),
        PROP_IS_ECHO("is_echo"),
        PROP_QUICK_REPLY("quick_reply"),
        PROP_TEXT("text"),
        PROP_ATTACHMENTS("attachments"),
        PROP_PAYLOAD("payload"),
        PROP_TYPE("type"),
        PROP_URL("url"),
        PROP_COORDINATES("coordinates"),
        PROP_LAT("lat"),
        PROP_LONG("long"),
        PROP_REF("ref"),
        PROP_USER_REF("user_ref"),
        PROP_APP_ID("app_id"),
        PROP_METADATA("metadata"),
        PROP_POSTBACK("postback"),
        PROP_ACCOUNT_LINKING("account_linking"),
        PROP_STATUS("status"),
        PROP_AUTHORIZATION_CODE("authorization_code"),
        PROP_READ("read"),
        PROP_WATERMARK("watermark"),
        PROP_DELIVERY("delivery"),
        PROP_MIDS("mids"),
        PROP_RECIPIENT_ID("recipient_id"),
        PROP_MESSAGE_ID("message_id"),
        PROP_ATTACHMENT_ID("attachment_id"),
        PROP_ERROR("error"),
        PROP_CODE("code"),
        PROP_FB_TRACE_ID("fbtrace_id"),
        PROP_RESULT("result"),
        PROP_FIRST_NAME("first_name"),
        PROP_LAST_NAME("last_name"),
        PROP_PROFILE_PIC("profile_pic"),
        PROP_LOCALE("locale"),
        PROP_TIMEZONE("timezone"),
        PROP_GENDER("gender"),
        PROP_TITLE("title"),
        PROP_REFERRAL("referral"),
        PROP_SOURCE("source"),
        PROP_AD_ID("ad_id"),
        PROP_IS_PAYMENT_ENABLED("is_payment_enabled"),
        PROP_LAST_AD_REFERRAL("last_ad_referral"),
        PROP_NLP("nlp"),
        PROP_ENTITIES("entities"),
        PROP_PRIOR_MESSAGE("prior_message"),
        PROP_IDENTIFIER("identifier"),
        PROP_GAME_PLAY("game_play"),
        PROP_GAME_ID("game_id"),
        PROP_PLAYER_ID("player_id"),
        PROP_CONTEXT_TYPE("context_type"),
        PROP_CONTEXT_ID("context_id"),
        PROP_SCORE("score");

        private final String value;

        Constants(String value) {
            this.value = value;
        }

        String value() {
            return value;
        }
    }
}