org.netxms.websvc.json.JsonTools.java Source code

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Here is the source code for org.netxms.websvc.json.JsonTools.java

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/**
 * NetXMS - open source network management system
 * Copyright (C) 2003-2017 Raden Solutions
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.netxms.websvc.json;

import java.net.InetAddress;
import java.util.Date;
import org.netxms.base.InetAddressEx;
import org.netxms.base.annotations.Internal;
import org.netxms.client.MacAddress;
import org.netxms.websvc.json.adapters.DateAdapter;
import org.netxms.websvc.json.adapters.InetAddressAdapter;
import org.netxms.websvc.json.adapters.InetAddressExAdapter;
import org.netxms.websvc.json.adapters.MacAddressAdapter;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

/**
 * Collection of JSON tools
 */
public class JsonTools {
    /**
     * Create JSON representation for given object
     * 
     * @param object object to serialize
     * @return JSON code
     */
    public static String jsonFromObject(Object object) {
        if (object instanceof JsonObject)
            return ((JsonObject) object).toString();
        if (object instanceof ResponseContainer)
            return ((ResponseContainer) object).toJson();

        GsonBuilder builder = new GsonBuilder();
        builder.setPrettyPrinting(); // FIXME: remove for production
        builder.registerTypeAdapter(Date.class, new DateAdapter());
        builder.registerTypeAdapter(InetAddress.class, new InetAddressAdapter());
        builder.registerTypeAdapter(InetAddressEx.class, new InetAddressExAdapter());
        builder.registerTypeAdapter(MacAddress.class, new MacAddressAdapter());
        builder.setExclusionStrategies(new ExclusionStrategy() {
            @Override
            public boolean shouldSkipField(FieldAttributes f) {
                return f.getAnnotation(Internal.class) != null;
            }

            @Override
            public boolean shouldSkipClass(Class<?> c) {
                return c.isAnnotationPresent(Internal.class);
            }
        });
        return builder.create().toJson(object);
    }

    /**
     * Create JsonObject from JSON code. Will return empty object if input string cannot be parsed.
     * 
     * @param json JSON code
     * @return Parsed JsonObject
     */
    public static JsonObject objectFromJson(String json) {
        try {
            JsonParser parser = new JsonParser();
            return parser.parse(json).getAsJsonObject();
        } catch (Exception e) {
            return new JsonObject();
        }
    }
}