com.hybris.mobile.utility.JsonUtils.java Source code

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Here is the source code for com.hybris.mobile.utility.JsonUtils.java

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/*******************************************************************************
 * [y] hybris Platform
 *  
 *   Copyright (c) 2000-2013 hybris AG
 *   All rights reserved.
 *  
 *   This software is the confidential and proprietary information of hybris
 *   ("Confidential Information"). You shall not disclose such Confidential
 *   Information and shall use it only in accordance with the terms of the
 *   license agreement you entered into with hybris.
 ******************************************************************************/
package com.hybris.mobile.utility;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;
import com.hybris.mobile.model.Facet;
import com.hybris.mobile.model.GenericNameCode;
import com.hybris.mobile.model.GenericValue;
import com.hybris.mobile.model.cart.CartDeliveryAddress;
import com.hybris.mobile.model.cart.CartDeliveryMode;
import com.hybris.mobile.model.cart.CartEntry;
import com.hybris.mobile.model.cart.CartPaymentInfo;

public final class JsonUtils {

    private static final Gson gson = new Gson();

    /**
     * Return true if the json has the property
     * 
     * @param json
     * @param property
     * @return
     */
    public static boolean has(String json, String property) {
        JsonParser parser = new JsonParser();
        JsonObject jsonObject = parser.parse(json).getAsJsonObject();

        return jsonObject.get(property) != null && StringUtils.isNotBlank(jsonObject.get(property).getAsString());
    }

    /**
     * Get the java object associated to the JSON string
     * 
     * @param json
     * @param className
     * @return
     */
    public static <T> T fromJson(String json, Class<T> className) {
        return gson.fromJson(json, className);
    }

    /**
     * Get the java object associated to the JSON string within the property name
     * 
     * @param json
     * @param property
     * @param className
     * @return
     */
    public static <T> T fromJson(String json, String property, Class<T> className) {
        JsonParser parser = new JsonParser();
        JsonObject jsonObject = parser.parse(json).getAsJsonObject();

        if (jsonObject != null && jsonObject.get(property) != null) {
            return gson.fromJson(jsonObject.get(property), className);
        } else {
            return null;
        }

    }

    /**
     * Get the java object List associated to the JSON string
     * 
     * @param json
     * @param className
     * @return
     */
    public static <T> List<T> fromJsonList(String json, Class<T> className) {

        // TODO - find a way so parameterize the TypeToken directly with the class specified as className
        Type listType = getAssociatedTypeFromClass(className);

        if (listType != null) {
            return gson.fromJson(json, listType);
        } else {
            return new ArrayList<T>();
        }

    }

    /**
     * Get the java object List associated to the JSON string within the property name
     * 
     * @param json
     * @param property
     * @param className
     * @return
     */
    public static <T> List<T> fromJsonList(String json, String property, Class<T> className) {
        JsonParser parser = new JsonParser();
        JsonObject jsonObject = parser.parse(json).getAsJsonObject();

        Type listType = getAssociatedTypeFromClass(className);

        if (listType != null) {
            return gson.fromJson(jsonObject.get(property), listType);
        } else {
            return new ArrayList<T>();
        }

    }

    /**
     * Convert the java object to a Json String
     * 
     * @param object
     * @return
     */
    public static String toJson(Object object) {
        return gson.toJson(object);
    }

    /**
     * Return the Type associated to the Class
     * 
     * @param <T>
     * 
     * @param className
     * @return
     */
    private static <T> Type getAssociatedTypeFromClass(Class<T> className) {
        Type listType = null;

        if (className.equals(CartEntry.class)) {
            listType = new TypeToken<List<CartEntry>>() {
            }.getType();
        } else if (className.equals(Facet.class)) {
            listType = new TypeToken<List<Facet>>() {
            }.getType();
        } else if (className.equals(GenericNameCode.class)) {
            listType = new TypeToken<List<GenericNameCode>>() {
            }.getType();
        } else if (className.equals(GenericValue.class)) {
            listType = new TypeToken<List<GenericValue>>() {
            }.getType();
        } else if (className.equals(CartDeliveryMode.class)) {
            listType = new TypeToken<List<CartDeliveryMode>>() {
            }.getType();
        } else if (className.equals(CartPaymentInfo.class)) {
            listType = new TypeToken<List<CartPaymentInfo>>() {
            }.getType();
        } else if (className.equals(CartDeliveryAddress.class)) {
            listType = new TypeToken<List<CartDeliveryAddress>>() {
            }.getType();
        }

        return listType;
    }

}