net.sf.jmatchparser.util
Class LineCountVerifyReader

java.lang.Object
  java.io.Reader
      net.sf.jmatchparser.util.LineCountVerifyReader

All Implemented Interfaces:

Closeable, Readable

public class LineCountVerifyReader
extends Reader

A Reader that reads from a BufferedReader and counts the lines read. At the end of the output, there is a marker followed by the actual line count. If the line count is wrong, an exception is thrown, else the line count and everything after it is ignored. As a convenience, when closing a not fully consumed reader, the remaining lines are read and the line count is verified. Therefore, to verify the line count without reading the contents, it is sufficient to close the reader.

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

LineCountVerifyReader(BufferedReader br, Pattern lineCountMarkerPattern, Pattern lineCountPattern, int lineCountOffset)
Create a new reader.

Method Summary

void	close()
int	read(char[] cbuf, int off, int len)
boolean	ready()

Methods inherited from class java.io.Reader

mark, markSupported, read, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

LineCountVerifyReader

public LineCountVerifyReader(BufferedReader br,
                             Pattern lineCountMarkerPattern,
                             Pattern lineCountPattern,
                             int lineCountOffset)

Create a new reader.

Parameters:

br - Buffered reader to read from

lineCountMarkerPattern - Pattern of the line that marks the end of the file and the following line count

lineCountPattern - Pattern of the line that contains the line count as group 1. If null group 1 of the previous pattern contains the line count

lineCountOffset - Difference between number of lines and line count printed. Positive if the printed line count is higher and vice versa

Method Detail

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException