Package com.google.code.externalsorting

Class BinaryFileBuffer

java.lang.Object

com.google.code.externalsorting.BinaryFileBuffer

All Implemented Interfaces:

IOStringStack

public final class BinaryFileBuffer
extends Object
implements IOStringStack

This is essentially a thin wrapper on top of a BufferedReader... which keeps the last line in memory.

Constructor Summary

Constructors

Constructor	Description
BinaryFileBuffer(BufferedReader r)	Constructs a BinaryFileBuffer wrapping the given BufferedReader.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the underlying BufferedReader.
boolean	empty()	Checks if the buffer is empty.
String	peek()	Returns the next line in the buffer without removing it.
String	pop()	Removes and returns the next line in the buffer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BinaryFileBuffer

public BinaryFileBuffer(BufferedReader r)
                 throws IOException

Constructs a BinaryFileBuffer wrapping the given BufferedReader.

Parameters:

r - the BufferedReader to wrap

Throws:

IOException - if an I/O error occurs

Method Details

close

public void close()
           throws IOException

Closes the underlying BufferedReader.

Specified by:

close in interface IOStringStack

Throws:

IOException - if an I/O error occurs

empty

public boolean empty()

Checks if the buffer is empty.

Specified by:

empty in interface IOStringStack

Returns:

true if there are no more lines to read

peek

public String peek()

Returns the next line in the buffer without removing it.

Specified by:

peek in interface IOStringStack

Returns:

the next line as a String, or null if empty

pop

public String pop()
           throws IOException

Removes and returns the next line in the buffer.

Specified by:

pop in interface IOStringStack

Returns:

the next line as a String

Throws:

IOException - if an I/O error occurs