fireio.java

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/*
 * Fire (Flexible Interface Rendering Engine) is a set of graphics widgets for creating GUIs for j2me applications. 
 * Copyright (C) 2006-2008 Bluevibe (www.bluevibe.net)
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 */


/*
 * Created on Sep 14, 2006
 *
 */
package gr.fire.util;


import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Vector;

import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;

/**
 * FireIO is a utility class containing a set of I/O supporting methods.
 * It also acts as a cache for loaded images. If an image is loaded once and is later requested again, the old instance will be returned.
 * This minimizes the memory requirements of an application GUI, without extra efford on the developer side.  
 * @author padeler
 *
 */
public final class FireIO
{
	
	private static final boolean NORECORDSTORE=false;
	private static final int BUFSIZE=500;

	private static Hashtable buffer=new Hashtable();
	private static int bufferSize=0;
	private static String downloadLocation=null;
	
	private static Object lock = new Object();
	
	private FireIO() throws Exception
	{
	}
	
	/**
	 * Deletes all record stores of this midlet
	 */
	public static void deleteAll() throws Exception
	{
		Vector allFiles = list();
		for(int i =0 ;i<allFiles.size();++i)
		{
			String file = (String)allFiles.elementAt(i);
			deleteFile(file);
		}
	}
	
	/**
	 * 
	 * Lists all record stores of this middlet.
	 *  
	 * @return
	 * 
	 */
	public static Vector list()  
	{
		Vector res = new Vector();
		try{
			String []names = RecordStore.listRecordStores();
			if(names!=null)
			{
				for(int i =0 ;i<names.length;++i)
				{
					String fileName = names[i];
					res.addElement(fileName);
				}
			}
		}catch(Exception e)
		{
			Log.logError("List Files Error",e);
		}
		return res;
	}
	
	public static void deleteFile(String file) throws Exception
	{
		synchronized (lock)
		{
			RecordStore.deleteRecordStore(file);
		}
	}
	
	
	static int[] recordStoreSize(String name)
	{
		RecordStore rs =null;
		try{
			rs = RecordStore.openRecordStore(name,false);
			return new int[]{rs.getSize(),rs.getSizeAvailable()};
		}catch(Exception e)
		{
			Log.logError("Failed to get size for RecordStore "+name,e);
		}finally{
			try{if(rs!=null) rs.closeRecordStore();}catch(Throwable e){}
		}
		return new int[]{0,0};
	}
	
	public static int total()
	{
		String recordStores[] = RecordStore.listRecordStores();
		if(recordStores!=null)
		{
			int sum=0;
			for(int i =0 ;i<recordStores.length;++i)
			{
				sum+= recordStoreSize(recordStores[i])[0];
			}
			return sum;
		}
		return 0;
	}
	
	public static int size(String file)
	{
		return recordStoreSize(file)[0];
	}
	
	public static int free()
	{
		String recordStores[] = RecordStore.listRecordStores();
		if(recordStores!=null && recordStores.length>0)
		{
			return recordStoreSize(recordStores[0])[1];
		}
		return 0;
	}
		
	
	public static void write(String file,byte[] buffer) throws Exception
	{
		RecordStore fr=null;
		try{
			fr = RecordStore.openRecordStore(file,true,RecordStore.AUTHMODE_PRIVATE,true);
			RecordEnumeration re = fr.enumerateRecords(null,null,false);
			if(re.hasNextElement())
			{
				int id = re.nextRecordId();
				fr.deleteRecord(id);	
			}
			fr.addRecord(buffer,0,buffer.length);
		}finally{
			 try{if(fr!=null)fr.closeRecordStore();}catch(Exception e){}
		}
	}
	
	/**
	 * Reads a recordstore and returns a stream to it.
	 * @param f
	 * @return
	 */
	public static InputStream read(String f) throws Exception
	{
		RecordStore fr=null;
		try{
			fr = RecordStore.openRecordStore(f,false,RecordStore.AUTHMODE_PRIVATE,false);
			RecordEnumeration re = fr.enumerateRecords(null,null,false);
			if(re.hasNextElement())
			{
				return new ByteArrayInputStream(re.nextRecord());
			}
			return null;
		}finally{
			 try{if(fr!=null)fr.closeRecordStore();}catch(Exception e){}
		}
	}





	public static int getBufferSize()
	{
		return bufferSize;
	}

	public static void setBufferSize(int bufferSize)
	{
		if(bufferSize<0) bufferSize=0;
		FireIO.bufferSize = bufferSize;
	}

	public static String getDownloadLocation()
	{
		return downloadLocation;
	}

	public static void setDownloadLocation(String downloadLocation)
	{
		FireIO.downloadLocation = downloadLocation;
	}
}