Initial code check in continued

src/playlist/PlaylistManager.java

@@ -0,0 +1,214 @@
+/*******************************************************************************
+ *     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 playlist;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
+
+import log.Log;
+import properties.SystemProperties;
+
+public class PlaylistManager
+{
+	private Playlist mPlaylist = new Playlist();
+	
+	public PlaylistManager()
+	{
+		init();
+	}
+
+	public Playlist getPlayist()
+	{
+		return mPlaylist;
+	}
+
+	/**
+	 * Loads playlist from the current playlist file, or the default playlist file,
+	 * as specified in the current SDRTRunk system settings
+	 */
+	private void init()
+	{
+		SystemProperties props = SystemProperties.getInstance();
+		
+		Path playlistFolder = props.getApplicationFolder( "playlist" );
+		
+		String defaultPlaylistFile = 
+				props.get( "playlist.defaultfilename", "playlist.xml" );
+		
+		String playlistFile = 
+				props.get( "playlist.currentfilename", defaultPlaylistFile );
+		
+		load( playlistFolder.resolve( playlistFile ) );
+	}
+	
+
+	public void save()
+	{
+		JAXBContext context = null;
+		
+		SystemProperties props = SystemProperties.getInstance();
+
+		Path playlistPath = props.getApplicationFolder( "playlist" );
+		
+		String playlistDefault = props.get( "playlist.defaultfilename", 
+										 "playlist.xml" );
+
+		String playlistCurrent = props.get( "playlist.currentfilename", 
+										 playlistDefault );
+		
+		Path filePath = playlistPath.resolve( playlistCurrent );
+		
+		File outputFile = new File( filePath.toString() );
+
+		try
+		{
+			if( !outputFile.exists() )
+			{
+				outputFile.createNewFile();
+			}
+		}
+		catch( Exception e )
+		{
+			Log.error( "PlaylistManager - couldn't create file to save playlist [" + filePath.toString() + "]" );
+		}
+		
+		OutputStream out = null;
+		
+		try
+        {
+	        out = new FileOutputStream( outputFile );
+	        
+			try
+	        {
+		        context = JAXBContext.newInstance( Playlist.class );
+
+		        Marshaller m = context.createMarshaller();
+
+		        m.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, true );
+	        
+		        m.marshal( mPlaylist, out );
+	        }
+	        catch ( JAXBException e )
+	        {
+		        Log.error( "PlaylistManager - jaxb exception while saving " +
+		        		"playlist: " + e.getLocalizedMessage() );
+		        e.printStackTrace();
+	        }
+        }
+        catch ( Exception e )
+        {
+        	Log.error( "PlaylistManager - coulcn't open outputstream to " +
+        			"save playlist [" + filePath.toString() + "]" );
+        }
+		finally
+		{
+			if( out != null )
+			{
+				try
+                {
+	                out.close();
+                }
+                catch ( IOException e )
+                {
+	                e.printStackTrace();
+                }
+			}
+		}
+	}
+	
+	/**
+	 * Erases current playlist and loads playlist from the playlistPath filename,
+	 * if it exists.
+	 */
+	public void load( Path playlistPath )
+	{
+		if( Files.exists( playlistPath ) )
+		{
+			Log.info( "PlaylistManager - loading playlist file [" + 
+							playlistPath.toString() + "]" );
+			
+			JAXBContext context = null;
+			
+			InputStream in = null;
+			
+			try
+	        {
+		        in = new FileInputStream( playlistPath.toString() );
+		        
+				try
+		        {
+			        context = JAXBContext.newInstance( Playlist.class );
+
+			        Unmarshaller m = context.createUnmarshaller();
+
+			        mPlaylist = (Playlist)m.unmarshal( in );
+		        }
+		        catch ( JAXBException e )
+		        {
+			        Log.error( "PlaylistManager - jaxb exception while loading " +
+			        		"playlist: " + e.getLocalizedMessage() );
+			        		
+			        e.printStackTrace();
+		        }
+	        }
+	        catch ( Exception e )
+	        {
+	        	e.printStackTrace();
+	        	Log.error( "PlaylistManager - coulcn't open inputstream to " +
+	        			"load playlist [" + playlistPath.toString() + "]" );
+	        }
+			finally
+			{
+				if( in != null )
+				{
+					try
+	                {
+		                in.close();
+	                }
+	                catch ( IOException e )
+	                {
+	                	Log.error( "PlaylistManager - exception while closing " +
+	                			"the playlist file inputstream reader - " + 
+	                			e.getLocalizedMessage() );
+	                }
+				}
+			}
+		}
+		else
+		{
+			Log.info( "PlaylistManager - playlist does not exist [" + 
+							playlistPath.toString() + "]" );
+		}
+		
+		if( mPlaylist == null )
+		{
+			mPlaylist = new Playlist();
+		}
+	}
+}