if ( this.totalCacheNo == 0 )
if ( dir == null )
	private File getCacheFile( int cacheIndex )	{		String tempDirStr = System.getProperty( "java.io.tmpdir" )				+ File.separatorChar + this.fileNamePrefix;		if ( this.totalCacheNo == 0 )		{			dir = new File( tempDirStr );			dir.mkdir( );		}		return new File( tempDirStr + File.separatorChar + cacheIndex + ".tmp" );	}