Adding log level control

src/main/java/com/bwssystems/HABridge/BridgeSettings.java

@@ -15,6 +15,8 @@ import org.apache.http.conn.util.InetAddressUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.bwssystems.util.BackupHandler;
+import com.bwssystems.util.JsonTransformer;
 import com.google.gson.Gson;
 
 public class BridgeSettings extends BackupHandler {

src/main/java/com/bwssystems/HABridge/BridgeSettingsDescriptor.java

@@ -20,6 +20,7 @@ public class BridgeSettingsDescriptor {
 	private boolean harmonyconfigured;
 	private boolean nestconfigured;
 	private String configfile;
+	private Integer numberoflogmessages;
 	
 	public BridgeSettingsDescriptor() {
 		super();
@@ -137,6 +138,12 @@ public class BridgeSettingsDescriptor {
 	public void setConfigfile(String configfile) {
 		this.configfile = configfile;
 	}
+	public Integer getNumberoflogmessages() {
+		return numberoflogmessages;
+	}
+	public void setNumberoflogmessages(Integer numberoflogmessages) {
+		this.numberoflogmessages = numberoflogmessages;
+	}
 	public Boolean isValidVera() {
 		if(this.getVeraAddress() == null)
 			return false;

src/main/java/com/bwssystems/HABridge/SystemControl.java

@@ -17,6 +17,9 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.bwssystems.HABridge.dao.BackupFilename;
+import com.bwssystems.logservices.LoggingManager;
+import com.bwssystems.util.JsonFreeTextStringFormatter;
+import com.bwssystems.util.JsonTransformer;
 import com.google.gson.Gson;
 
 import ch.qos.logback.classic.LoggerContext;
@@ -33,6 +36,7 @@ public class SystemControl {
     private Version version;
     private CyclicBufferAppender<ILoggingEvent> cyclicBufferAppender;
     private DateFormat dateFormat;
+    private LoggingManager theLogServiceMgr;
 
 
 	public SystemControl(BridgeSettings theBridgeSettings, Version theVersion) {
@@ -41,6 +45,9 @@ public class SystemControl {
 		this.lc = (LoggerContext) LoggerFactory.getILoggerFactory(); 
 		this.dateFormat = new SimpleDateFormat("MM-dd-yyyy HH:mm:ss.SSS");
 		reacquireCBA();
+		theLogServiceMgr = new LoggingManager();
+		theLogServiceMgr.setShowAll(true);
+		theLogServiceMgr.init();
 	}
 
 //	This function sets up the sparkjava rest calls for the hue api
@@ -53,7 +60,7 @@ public class SystemControl {
 	        return "{\"version\":\"" + version.getVersion() + "\"}";
 	    });
 
-	    // http://ip_address:port/system/logmsgs gets the version of this bridge instance
+	    // http://ip_address:port/system/logmsgs gets the log messages for the bridge
     	get (SYSTEM_CONTEXT + "/logmsgs", "application/json", (request, response) -> {
 			log.debug("Get logmsgs.");
 			response.status(HttpStatus.SC_OK);
@@ -73,14 +80,23 @@ public class SystemControl {
 				LoggingEvent le;
 				for (int i = 0; i < count; i++) {
 					le = (LoggingEvent) cyclicBufferAppender.get(i);
-					logMsgs = logMsgs + ( i > 0?",{":"{") + "\"time\":\"" + dateFormat.format(le.getTimeStamp()) + "\",\"level\":\"" + le.getLevel().levelStr + "\",\"component\":\"" + le.getLoggerName() + "\",\"message\":\"" + le.getFormattedMessage() + "\"}";
+					logMsgs = logMsgs + ( i > 0?",{":"{") + "\"time\":\"" + dateFormat.format(le.getTimeStamp()) + "\",\"level\":\"" + le.getLevel().levelStr + "\",\"component\":\"" + le.getLoggerName() + "\",\"message\":\"" + JsonFreeTextStringFormatter.forJSON(le.getFormattedMessage()) + "\"}";
 				}
 		    }
 		    logMsgs = logMsgs + "]";
+			response.status(200);
 			return logMsgs;
 	    });
 
-//      http://ip_address:port/system/settings which returns the bridge configuration settings
+	    // http://ip_address:port/system/logmgmt/loggers gets the logger info for the bridge
+    	get (SYSTEM_CONTEXT + "/logmgmt/loggers", "application/json", (request, response) -> {
+			log.debug("Get loggers info.");
+			theLogServiceMgr.init();
+			response.status(200);
+			return theLogServiceMgr.getConfiguredLoggers();
+	    }, new JsonTransformer());
+
+    	//      http://ip_address:port/system/settings which returns the bridge configuration settings
 		get(SYSTEM_CONTEXT + "/settings", "application/json", (request, response) -> {
 			log.debug("bridge settings requested from " + request.ip());
 

src/main/java/com/bwssystems/HABridge/dao/DeviceRepository.java

@@ -15,9 +15,9 @@ import java.util.Random;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.bwssystems.HABridge.BackupHandler;
-import com.bwssystems.HABridge.JsonTransformer;
 import com.bwssystems.HABridge.dao.DeviceDescriptor;
+import com.bwssystems.util.BackupHandler;
+import com.bwssystems.util.JsonTransformer;
 import com.google.gson.stream.JsonReader;
 
 import java.util.List;

src/main/java/com/bwssystems/HABridge/devicemanagmeent/DeviceResource.java

@@ -16,7 +16,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.bwssystems.HABridge.BridgeSettingsDescriptor;
-import com.bwssystems.HABridge.JsonTransformer;
 import com.bwssystems.HABridge.dao.BackupFilename;
 import com.bwssystems.HABridge.dao.DeviceDescriptor;
 import com.bwssystems.HABridge.dao.DeviceRepository;
@@ -25,6 +24,7 @@ import com.bwssystems.NestBridge.NestHome;
 import com.bwssystems.harmony.HarmonyHome;
 import com.bwssystems.luupRequests.Device;
 import com.bwssystems.luupRequests.Scene;
+import com.bwssystems.util.JsonTransformer;
 import com.bwssystems.vera.VeraHome;
 import com.google.gson.Gson;
 

src/main/java/com/bwssystems/HABridge/hue/HueMulator.java

@@ -1,7 +1,6 @@
 package com.bwssystems.HABridge.hue;
 
 import com.bwssystems.HABridge.BridgeSettingsDescriptor;
-import com.bwssystems.HABridge.JsonTransformer;
 import com.bwssystems.HABridge.api.UserCreateRequest;
 import com.bwssystems.HABridge.api.hue.DeviceResponse;
 import com.bwssystems.HABridge.api.hue.DeviceState;
@@ -14,6 +13,7 @@ import com.bwssystems.harmony.HarmonyHandler;
 import com.bwssystems.harmony.HarmonyHome;
 import com.bwssystems.harmony.RunActivity;
 import com.bwssystems.nest.controller.Nest;
+import com.bwssystems.util.JsonTransformer;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.gson.Gson;

src/main/java/com/bwssystems/logservices/LogFileInfo.java

@@ -0,0 +1,50 @@
+/*
+*	http://www.jrecruiter.org
+*
+*	Disclaimer of Warranty.
+*
+*	Unless required by applicable law or agreed to in writing, Licensor provides
+*	the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
+*	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
+*	including, without limitation, any warranties or conditions of TITLE,
+*	NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
+*	solely responsible for determining the appropriateness of using or
+*	redistributing the Work and assume any risks associated with Your exercise of
+*	permissions under this License.
+*
+*/
+package com.bwssystems.logservices;
+
+import java.util.Date;
+
+/**
+ * Log file information.
+ *
+ */
+public class LogFileInfo {
+
+    private String fileName;
+    private Long fileSize;
+    private Date fileLastChanged;
+    
+	public String getFileName() {
+		return fileName;
+	}
+	
+	public void setFileName(String fileName) {
+		this.fileName = fileName;
+	}
+	public Long getFileSize() {
+		return fileSize;
+	}
+	public void setFileSize(Long fileSize) {
+		this.fileSize = fileSize;
+	}
+	public Date getFileLastChanged() {
+		return fileLastChanged;
+	}
+	public void setFileLastChanged(Date fileLastChanged) {
+		this.fileLastChanged = fileLastChanged;
+	}
+
+}

src/main/java/com/bwssystems/logservices/LoggerInfo.java

@@ -0,0 +1,51 @@
+package com.bwssystems.logservices;
+
+import com.bwssystems.logservices.LoggingUtil.LogLevels;
+
+/**
+ * Logger information.
+ *
+ *
+ */
+public class LoggerInfo {
+
+	private String    loggerName;
+    private LogLevels logLevel;
+    private LogLevels newLogLevel;
+    
+    //~~~~~Constructors~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	
+    /**
+	 * 
+	 */
+	public LoggerInfo() {
+		super();
+	}
+	public LoggerInfo(String loggerName, int logLevelAsInt) {
+		super();
+		this.loggerName = loggerName;
+		this.logLevel = LogLevels.getLogLevelFromId(logLevelAsInt);
+	}
+    
+	//~~~~~Getters and Setters~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	
+	public String getLoggerName() {
+		return loggerName;
+	}
+	public void setLoggerName(String loggerName) {
+		this.loggerName = loggerName;
+	}
+	public LogLevels getLogLevel() {
+		return logLevel;
+	}
+	public void setLogLevel(LogLevels logLevel) {
+		this.logLevel = logLevel;
+	}
+	public LogLevels getNewLogLevel() {
+		return newLogLevel;
+	}
+	public void setNewLogLevel(LogLevels newLogLevel) {
+		this.newLogLevel = newLogLevel;
+	}
+	
+}

src/main/java/com/bwssystems/logservices/LoggingForm.java

@@ -0,0 +1,58 @@
+package com.bwssystems.logservices;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Form for the Logging Action.
+ */
+public class LoggingForm implements Serializable {
+
+    /** serialVersionUID. */
+	private static final long serialVersionUID = 5970927715241338665L;
+
+	/** List of Loggers, simplified for display purposes */
+    private List<LoggerInfo> updatedLoggers = new ArrayList<LoggerInfo>();
+
+    /** The user can enter a new logger to be configured */
+    private LoggerInfo newLogger;
+    
+    /** Used for requesting a logfile download */
+    private String fileName;
+    
+    //~~~~~Constructors~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	
+	public LoggingForm() {
+		super();
+	}
+
+    
+	//~~~~~Getters and Setters~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	
+	
+	public List<LoggerInfo> getUpdatedLoggers() {
+		return updatedLoggers;
+	}
+
+	public void setUpdatedLoggers(List<LoggerInfo> updatedLoggers) {
+		this.updatedLoggers = updatedLoggers;
+	}
+
+	public LoggerInfo getNewLogger() {
+		return newLogger;
+	}
+
+	public void setNewLogger(LoggerInfo newLogger) {
+		this.newLogger = newLogger;
+	}
+
+	public String getFileName() {
+		return fileName;
+	}
+
+	public void setFileName(String fileName) {
+		this.fileName = fileName;
+	}
+	
+}

src/main/java/com/bwssystems/logservices/LoggingManager.java

@@ -0,0 +1,163 @@
+package com.bwssystems.logservices;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Set;
+
+import com.bwssystems.logservices.LoggingUtil;
+import com.bwssystems.logservices.LoggingUtil.LogLevels;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+
+/**
+ * Show log files and allow to set log levels for the configured loggers (logback)
+ * to be changed dynamically at runtime.
+ */
+
+public class LoggingManager {
+
+	/** Show all loggers or only the configured loggers */
+    private boolean showAll = false;
+    
+    /** List of log files and associated information */
+    private List<LogFileInfo> logFileInfos = new ArrayList<LogFileInfo>();
+    
+    /** List of Loggers, simplified for display purposes */
+    private List<LoggerInfo> configuredLoggers =  new ArrayList<LoggerInfo>();
+    
+    /** Used to stream a logfile back to the client */
+    private transient InputStream fileToDownLoad;
+    
+    private LoggingForm model = new LoggingForm();
+    
+    //~~~~~Reference Data~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    
+    /** Defines a collection of log levels. Unfortunately logback does not use 
+     *  enums to define its log levels. */
+    private Set<LogLevels> logLevels = EnumSet.allOf(LogLevels.class); 
+    
+    //~~~~~Prepare data~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    
+	public void init() {
+		loadLoggers();
+		loadLogFiles();
+	}
+	
+	//~~~~~Helper Methods~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+	private void loadLoggers() {
+		this.configuredLoggers.clear();
+		
+    	final List<Logger> loggers = LoggingUtil.getLoggers(this.showAll);
+    	
+    	for (Logger logger : loggers) {
+    		
+    		this.configuredLoggers.add(new LoggerInfo(logger.getName(), logger.getEffectiveLevel().levelInt));
+    	}
+	}
+	
+	private void loadLogFiles() {
+		this.logFileInfos = LoggingUtil.getLogFileInfos();
+	}
+	
+	/** Updates loglevels for loggers */
+    public String updateLogLevels() {
+
+        if (this.model.getUpdatedLoggers() != null && !this.model.getUpdatedLoggers().isEmpty()) {
+        	
+        	for (LoggerInfo loggerInfo : this.model.getUpdatedLoggers()) {
+        		
+        		if (loggerInfo != null && loggerInfo.getNewLogLevel() != null) {
+        			
+        			LoggingUtil.getLogger(loggerInfo.getLoggerName())
+        			           .setLevel(Level.toLevel(loggerInfo.getNewLogLevel().getLogLevel()));
+        			
+        		}
+        	}
+        	
+        	//Need to refresh the loggers
+        	loadLoggers();
+        }
+        
+        
+        return "successRedirect";
+        
+    }
+	
+    /** Adds a new logger at runtime.  */
+	public String addNewLogger() {
+	
+        if (this.model.getNewLogger() != null 
+        		&& this.model.getNewLogger().getLoggerName() != null 
+        		&& this.model.getNewLogger().getNewLogLevel() != null) {
+        	final Logger newLogger = LoggingUtil.getLogger(this.model.getNewLogger().getLoggerName());
+        	newLogger.setLevel(Level.toLevel(this.model.getNewLogger().getNewLogLevel().getLogLevel()));  
+            
+        	//Need to refresh the loggers
+        	loadLoggers();
+        }
+		
+		return "successRedirect";
+	}
+	
+    /**
+     * Retrieve the requested log file.
+     * 
+     * @return
+     * @throws Exception
+     */
+    public String download() throws Exception {
+
+        if (this.model.getFileName() == null) {
+            throw new IllegalArgumentException("FileName must not be null.");
+        }
+        
+        final File logFile = LoggingUtil.getLogFile(this.model.getFileName());
+        
+        if (logFile != null) {
+        	this.fileToDownLoad = new FileInputStream(logFile);
+        }
+
+        return "download";
+    }
+
+    //~~~~~Getters and Setters~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    
+	public List<LogFileInfo> getLogFileInfos() {
+        return logFileInfos;
+    }
+
+    public InputStream getFileToDownLoad() {
+        return fileToDownLoad;
+    }
+
+    public List<LoggerInfo> getConfiguredLoggers() {
+		return configuredLoggers;
+	}
+
+	public boolean isShowAll() {
+        return showAll;
+    }
+
+    public void setShowAll(boolean showAll) {
+        this.showAll = showAll;
+    }
+    
+	public Set<LogLevels> getLogLevels() {
+		return logLevels;
+	}
+
+	public LoggingForm getModel() {
+		return model;
+	}
+
+	public void setModel(LoggingForm model) {
+		this.model = model;
+	}
+
+}

src/main/java/com/bwssystems/logservices/LoggingUtil.java

@@ -0,0 +1,198 @@
+package com.bwssystems.logservices;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+
+import com.bwssystems.logservices.LogFileInfo;
+import org.slf4j.LoggerFactory;
+
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.Appender;
+import ch.qos.logback.core.FileAppender;
+
+/**
+ * Contains utility methods to interact with the logback during runtime.
+ */
+public class LoggingUtil {
+
+	/**
+	 * re-defines the logback logging levels as a Java enumeration. This is quite
+	 * helpful if you need to render the various log-levels as select-box. I wish
+	 * logback @see {@link ch.qos.logback.classic.Level} would not use static variables
+	 * but use enums instead. 
+	 */
+	public enum LogLevels {
+
+		OFF(Integer.MAX_VALUE, "Off"),
+		ERROR_INT(40000, "Error"),
+		WARN_INT(30000, "Warn"),
+		INFO_INT(20000, "Info"),
+		DEBUG_INT(10000, "Debug"),
+		TRACE(5000, "Trace"),
+		ALL(Integer.MIN_VALUE, "All");
+
+		private int logLevel;	
+		private String logLevelName;
+
+		LogLevels(final int logLevel, final String logLevelName) {
+			this.logLevel = logLevel;
+			this.logLevelName = logLevelName; 
+		}
+
+		public int getLogLevel() {
+			return this.logLevel;
+		}
+
+		public String getLogLevelName() {
+			return this.logLevelName;
+		}
+
+		public static LogLevels getLogLevelFromId(final int logLevelAsInt) {
+
+			for (LogLevels logLevel : LogLevels.values()) {
+
+				if (logLevelAsInt == logLevel.logLevel) {
+					return logLevel;
+				}
+			}
+
+			throw new IllegalStateException("Loglevel " + logLevelAsInt + " does not exist.");
+
+		}
+
+		@Override
+		public String toString() {
+			return this.logLevelName;
+		}
+	}
+	
+	/**
+	 * Retrieve all configured logback loggers. 
+	 * 
+	 * @param showAll If set return ALL loggers, not only the configured ones.
+	 * @return List of Loggers
+	 */
+	public static List<ch.qos.logback.classic.Logger> getLoggers(final boolean showAll) {
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+		final List<ch.qos.logback.classic.Logger> loggers = new ArrayList<ch.qos.logback.classic.Logger>();
+
+		for (ch.qos.logback.classic.Logger log : lc.getLoggerList()) {
+			if(showAll == false) {
+				if(log.getLevel() != null || LoggingUtil.hasAppenders(log)) {
+					loggers.add(log);
+				}
+			} else {
+				loggers.add(log);
+			}
+		}
+
+		return loggers;
+	}
+
+	/**
+	 * Get a single logger. 
+	 * 
+	 * @return Logger
+	 */
+	public static ch.qos.logback.classic.Logger getLogger(final String loggerName) {
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		return lc.getLogger(loggerName);
+		
+	}
+	
+	/** 
+	 * Test whether the provided logger has appenders. 
+	 * 
+	 * @param logger The logger to test
+	 * @return true if the logger has appenders.
+	 */
+	public static boolean hasAppenders(ch.qos.logback.classic.Logger logger) {
+		Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+		return it.hasNext();
+	}
+
+	/**
+	 * Get the logfile information for the roor logger.
+	 * 
+	 * @return List of LogFileInfo obejcts
+	 */
+	public static List<LogFileInfo> getLogFileInfos() {
+		
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		final List<LogFileInfo> logFileInfos = new ArrayList<LogFileInfo>();
+
+		final Logger logger = lc.getLogger(Logger.ROOT_LOGGER_NAME);
+
+		final Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+
+		while (it.hasNext()) {
+
+			final Appender<ILoggingEvent> appender = it.next();
+
+			if (appender instanceof FileAppender) {
+
+				final FileAppender<ILoggingEvent> fileAppender = (FileAppender<ILoggingEvent>) appender;
+
+				final File logFile = new File(fileAppender.getFile());
+				final LogFileInfo logFileInfo = new LogFileInfo();
+
+				logFileInfo.setFileName(logFile.getName());
+				logFileInfo.setFileLastChanged(new Date(logFile.lastModified()));
+				logFileInfo.setFileSize(logFile.length());
+				logFileInfos.add(logFileInfo);
+			}
+
+		}
+
+		return logFileInfos;
+	}
+
+	/**
+	 * Get the log file.
+	 * 
+	 * @param logFileName The name of the log file 
+	 * @return The actual file
+	 */
+	public static File getLogFile(final String logFileName) {
+
+		if (logFileName == null) {
+			throw new IllegalArgumentException("logFileName cannot be null.");
+		}
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		final Logger logger = lc.getLogger(Logger.ROOT_LOGGER_NAME);
+
+		final Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+
+		while (it.hasNext()) {
+
+			final Appender<ILoggingEvent> appender = it.next();
+
+			if (appender instanceof FileAppender) {
+
+				final FileAppender<ILoggingEvent> fileAppender = (FileAppender<ILoggingEvent>) appender;
+
+				final File logFile = new File(fileAppender.getFile());
+
+				if (logFile.getName().equalsIgnoreCase(logFileName)) {
+					return logFile;
+				}
+
+			}
+
+		}
+
+		return null;
+	}
+
+}

src/main/java/com/bwssystems/util/BackupHandler.java

@@ -1,4 +1,4 @@
-package com.bwssystems.HABridge;
+package com.bwssystems.util;
 
 import java.io.IOException;
 import java.nio.file.DirectoryStream;

src/main/java/com/bwssystems/util/JsonFreeTextStringFormatter.java

@@ -0,0 +1,49 @@
+package com.bwssystems.util;
+
+import java.text.StringCharacterIterator;
+
+public final class JsonFreeTextStringFormatter {
+	  private JsonFreeTextStringFormatter(){
+		    //empty - prevent construction
+		  }
+
+	  public static String forJSON(String aText){
+		    final StringBuilder result = new StringBuilder();
+		    StringCharacterIterator iterator = new StringCharacterIterator(aText);
+		    char character = iterator.current();
+		    while (character != StringCharacterIterator.DONE){
+		      if( character == '\"' ){
+		        result.append("\\\"");
+		      }
+		      else if(character == '\\'){
+		        result.append("\\\\");
+		      }
+		      else if(character == '/'){
+		        result.append("\\/");
+		      }
+		      else if(character == '\b'){
+		        result.append("\\b");
+		      }
+		      else if(character == '\f'){
+		        result.append("\\f");
+		      }
+		      else if(character == '\n'){
+		        result.append("\\n");
+		      }
+		      else if(character == '\r'){
+		        result.append("\\r");
+		      }
+		      else if(character == '\t'){
+		        result.append("\\t");
+		      }
+		      else {
+		        //the char is not a special one
+		        //add it to the result as is
+		        result.append(character);
+		      }
+		      character = iterator.next();
+		    }
+		    return result.toString();    
+		  }
+
+}

src/main/java/com/bwssystems/util/JsonTransformer.java

@@ -1,4 +1,4 @@
-package com.bwssystems.HABridge;
+package com.bwssystems.util;
 
 import com.google.gson.Gson;
 import spark.ResponseTransformer;