TinyGJsonUtils.java

/*
 *
 *   Goko
 *   Copyright (C) 2013  PsyKo
 *
 *   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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */
package org.goko.controller.tinyg.commons;

import java.math.BigDecimal;

import org.apache.commons.lang3.StringUtils;
import org.goko.controller.tinyg.commons.configuration.AbstractTinyGConfiguration;
import org.goko.controller.tinyg.commons.configuration.TinyGGroupSettings;
import org.goko.controller.tinyg.commons.configuration.TinyGSetting;

import com.eclipsesource.json.JsonObject;

public class TinyGJsonUtils {
	public static final String SYSTEM_SETTINGS = "sys";
	
	/**
	 * Determines if a string can be parsed as json object
	 *
	 * @param str the string
	 * @return <code>true</code> or <code>false</code>
	 */
	public static boolean isJsonFormat(String str){
		return StringUtils.startsWith(str.trim(), "{") && StringUtils.endsWith(str.trim(), "}");
	}

	/**
	 * Convert a TinyGConfiguration to a Json object
	 *
	 * @param cfg the configuration to convert
	 * @return {@link JsonObject}
	 */
	public static JsonObject toJson(AbstractTinyGConfiguration<?> cfg){
		JsonObject result = new JsonObject();
		for(TinyGGroupSettings group: cfg.getGroups()){
			result.add(group.getGroupIdentifier(), toJson(group));
		}
		return result;
	}
	
	/**
	 * Write a group setting to Json object
	 *
	 * @param group the group
	 * @return {@link JsonObject}
	 */
	public static JsonObject toJson(TinyGGroupSettings group){

		JsonObject jsonParams = new JsonObject();
		for(TinyGSetting<?> setting : group.getSettings()){
			// Make sure we have to export the setting
			if(setting.isReadOnly() || setting.getValue() == null){
				continue;
			}
			if(setting.getType() == BigDecimal.class){
				jsonParams.add(setting.getIdentifier(), ((BigDecimal) setting.getValue()).doubleValue());
			}else if(setting.getType() == String.class){
				jsonParams.add(setting.getIdentifier(), ((String) setting.getValue()));
			}
		}
		return jsonParams;
	}

	public static JsonObject toJson(TinyGSetting<?> setting){
		// Make sure we have to export the setting
		if(setting == null || setting.isReadOnly() || setting.getValue() == null){
			return null;
		}
		JsonObject jsonParams = new JsonObject();

		if(setting.getType() == BigDecimal.class){
			jsonParams.add(setting.getIdentifier(), ((BigDecimal) setting.getValue()).doubleValue());
		}else if(setting.getType() == String.class){
			jsonParams.add(setting.getIdentifier(), ((String) setting.getValue()));
		}

		return jsonParams;
	}

	/**
	 * Returns a Json representation of a group. It includes the header of the group and the values
	 *
	 * @param group the group to transform
	 * @return {@link JsonObject}
	 */
	public static JsonObject toCompleteJson(TinyGGroupSettings group){
		JsonObject jsonGroup = null;
		JsonObject jsonGroupContent = toJson(group);
		if(jsonGroupContent != null && !jsonGroupContent.isEmpty()){
			jsonGroup = new JsonObject();
			jsonGroup.add(group.getGroupIdentifier(), jsonGroupContent);
		}
		return jsonGroup;
	}

//	/**
//	 * Extract the checksum value of a TinyG response envelope
//	 *
//	 * @param responseEnvelope
//	 * @return an Integer value corresponding to the checksum value, or <code>null</code> if not found
//	 */
//	private Integer getCommandChecksum(JsonObject responseEnvelope){
//		Integer result = null;
//		JsonValue footer = responseEnvelope.get(TinyGJsonUtils.FOOTER);
//		if(footer != null){
//			if(footer.isArray()){
//				JsonArray footerArray = footer.asArray();
//				JsonValue checksum = footerArray.get(TinyGJsonUtils.FOOTER_CHECKSUM_INDEX);
//				if(checksum.isNumber()){
//					result = checksum.asInt();
//				}
//			}
//		}
//		return result;
//	}
//	
//	/**
//	 * Compute the checksum of a command
//	 *
//	 * @param command the command
//	 * @return an Integer
//	 */
//	public Integer computeChecksum(List<Byte> command){
//		int checksum = 0;
//		for(Byte b : command){
//			checksum = 31 * checksum + b;
//		}
//		return checksum % HASHMASK;
//	}
//
//	/**
//	 * Registers the given value in the configuration
//	 *
//	 * @param groupIdentifier the group identifier (Optional)
//	 * @param settingIdentifier the setting identifier
//	 * @param value the value
//	 * @throws GkException GkException
//	 */
//	protected static <T> void setSettingValue(AbstractTinyGConfiguration configuration, String groupIdentifier, String settingIdentifier, T value) throws GkException{
//		for(TinyGGroupSettings group : configuration.getGroups()){
//			if(StringUtils.equals(group.getGroupIdentifier(),groupIdentifier)){
//				for(TinyGSetting setting : group.getSettings()){
//					if(StringUtils.equals(setting.getIdentifier(),settingIdentifier)){
//						LOG.debug("Setting parameter "+settingIdentifier+" of group '"+groupIdentifier+"' to value '"+String.valueOf(value)+"'");
//						setting.setValue(value);
//						return;
//					}
//				}
//			}
//		}
//	}
}