Initial code check in continued

src/eventlog/EventLogger.java

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+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     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 eventlog;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.nio.file.Path;
+
+import log.Log;
+import util.TimeStamp;
+
+public abstract class EventLogger
+{
+	private Path mLogDirectory;
+	private String mFileNameSuffix;
+	private String mLogFileName;
+	protected Writer mLogFile;
+
+	public EventLogger( Path logDirectory, String fileNameSuffix )
+	{
+		mLogDirectory = logDirectory;
+		mFileNameSuffix = fileNameSuffix;
+	}
+	
+	public String toString()
+	{
+		if( mLogFileName != null )
+		{
+			return mLogFileName;
+		}
+		else
+		{
+			return "Unknown";
+		}
+	}
+	
+	public abstract String getHeader();
+	
+    public void start()
+    {
+    	
+    	try 
+    	{
+    		StringBuilder sb = new StringBuilder();
+    		sb.append( mLogDirectory );
+    		sb.append( File.separator );
+    		sb.append( TimeStamp.getTimeStamp( "_" ) );
+    		sb.append( "_" );
+    		sb.append( mFileNameSuffix );
+    		
+    		mLogFileName = sb.toString();
+
+    		Log.info( "Creating log file:" + mLogFileName );
+    		
+			mLogFile = new OutputStreamWriter(new FileOutputStream( mLogFileName ) );
+			
+			write( getHeader() );
+		} 
+    	catch (FileNotFoundException e) 
+    	{
+    		Log.error("Couldn't create log file in directory:" + mLogDirectory );
+		}    	
+    }
+
+    public void stop()
+    {
+    	if( mLogFile != null )
+    	{
+    		try
+    		{
+    	    	mLogFile.flush();
+    	    	mLogFile.close();
+    		}
+    		catch( Exception e )
+    		{
+    			Log.error( "Couldn't close log file:" + mFileNameSuffix );
+    		}
+    	}
+    }
+    
+    protected void write( String eventLogEntry )
+    {
+		try
+        {
+	        mLogFile.write( eventLogEntry + "\n" );
+        }
+        catch ( IOException e )
+        {
+        	Log.error( "Error writing entry to event log file:" + e.getLocalizedMessage() );
+        }
+    }
+}