org.biojava3.core.sequence.io
Class BufferedReaderBytesRead

java.lang.Object
  extended by java.io.Reader
      extended by org.biojava3.core.sequence.io.BufferedReaderBytesRead
All Implemented Interfaces:
Closeable, Readable

public class BufferedReaderBytesRead
extends Reader

Need to keep track of actual bytes read and take advantage of buffered reader performance. Took java source for BufferedReader and added BytesRead functionality

Since:
JDK1.1
Version:
1.37, 06/03/15
Author:
Scooter Willis Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.

The buffer size may be specified, or the default size may be used. The default is large enough for most purposes.

In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReaderBytesRead around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders. For example,

 BufferedReaderBytesRead in
   = new BufferedReaderBytesRead(new FileReader("foo.in"));
 
will buffer the input from the specified file. Without buffering, each invocation of read() or readLine() could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient.

Programs that use DataInputStreams for textual input can be localized by replacing each DataInputStream with an appropriate BufferedReaderBytesRead., Mark Reinhold

See Also:
FileReader, InputStreamReader

Field Summary
 
Fields inherited from class java.io.Reader
lock
 
Constructor Summary
BufferedReaderBytesRead(Reader in)
          Creates a buffering character-input stream that uses a default-sized input buffer.
BufferedReaderBytesRead(Reader in, int sz)
          Creates a buffering character-input stream that uses an input buffer of the specified size.
 
Method Summary
 void close()
           
 long getBytesRead()
          Keep track of bytesread via ReadLine to account for CR-LF in the stream.
 void mark(int readAheadLimit)
          Marks the present position in the stream.
 boolean markSupported()
          Tells whether this stream supports the mark() operation, which it does.
 int read()
          Reads a single character.
 int read(char[] cbuf, int off, int len)
          Reads characters into a portion of an array.
 String readLine()
          Reads a line of text.
 boolean ready()
          Tells whether this stream is ready to be read.
 void reset()
          Resets the stream to the most recent mark.
 long skip(long n)
          Skips characters.
 
Methods inherited from class java.io.Reader
read, read
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BufferedReaderBytesRead

public BufferedReaderBytesRead(Reader in,
                               int sz)
Creates a buffering character-input stream that uses an input buffer of the specified size.

Parameters:
in - A Reader
sz - Input-buffer size
Throws:
IllegalArgumentException - If sz is <= 0

BufferedReaderBytesRead

public BufferedReaderBytesRead(Reader in)
Creates a buffering character-input stream that uses a default-sized input buffer.

Parameters:
in - A Reader
Method Detail

getBytesRead

public long getBytesRead()
Keep track of bytesread via ReadLine to account for CR-LF in the stream. Does not keep track of position if use methods other than ReadLine. //TODO should override other methods and throw exception or keep track of bytes read

Returns:

read

public int read()
         throws IOException
Reads a single character.

Overrides:
read in class Reader
Returns:
The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException
Reads characters into a portion of an array.

This method implements the general contract of the corresponding read method of the Reader class. As an additional convenience, it attempts to read as many characters as possible by repeatedly invoking the read method of the underlying stream. This iterated read continues until one of the following conditions becomes true:

If the first read on the underlying stream returns -1 to indicate end-of-file then this method returns -1. Otherwise this method returns the number of characters actually read.

Subclasses of this class are encouraged, but not required, to attempt to read as many characters as possible in the same fashion.

Ordinarily this method takes characters from this stream's character buffer, filling it from the underlying stream as necessary. If, however, the buffer is empty, the mark is not valid, and the requested length is at least as large as the buffer, then this method will read characters directly from the underlying stream into the given array. Thus redundant BufferedReaderBytesReads will not copy data unnecessarily.

Specified by:
read in class Reader
Parameters:
cbuf - Destination buffer
off - Offset at which to start storing characters
len - Maximum number of characters to read
Returns:
The number of characters read, or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

readLine

public String readLine()
                throws IOException
Reads a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.

Returns:
A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

skip

public long skip(long n)
          throws IOException
Skips characters.

Overrides:
skip in class Reader
Parameters:
n - The number of characters to skip
Returns:
The number of characters actually skipped
Throws:
IllegalArgumentException - If n is negative.
IOException - If an I/O error occurs

ready

public boolean ready()
              throws IOException
Tells whether this stream is ready to be read. A buffered character stream is ready if the buffer is not empty, or if the underlying character stream is ready.

Overrides:
ready in class Reader
Throws:
IOException - If an I/O error occurs

markSupported

public boolean markSupported()
Tells whether this stream supports the mark() operation, which it does.

Overrides:
markSupported in class Reader

mark

public void mark(int readAheadLimit)
          throws IOException
Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point.

Overrides:
mark in class Reader
Parameters:
readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. An attempt to reset the stream after reading characters up to this limit or beyond may fail. A limit value larger than the size of the input buffer will cause a new buffer to be allocated whose size is no smaller than limit. Therefore large values should be used with care.
Throws:
IllegalArgumentException - If readAheadLimit is < 0
IOException - If an I/O error occurs

reset

public void reset()
           throws IOException
Resets the stream to the most recent mark.

Overrides:
reset in class Reader
Throws:
IOException - If the stream has never been marked, or if the mark has been invalidated

close

public void close()
           throws IOException
Specified by:
close in interface Closeable
Specified by:
close in class Reader
Throws:
IOException