Package hec.server

Class TimeWindowFileReader

java.lang.Object

hec.server.TimeWindowFileReader

public class TimeWindowFileReader
extends Object

Constructor Summary

Constructors

Constructor	Description
TimeWindowFileReader()

Method Summary

Modifier and Type	Method	Description
long	findEndOffset(File file, String endTimeString, long fileStartOffset)	Finds the very last line in _file with the time in the specified minute
long	findStartOffset(File file, String startTimeString)
protected long	findTimeOffset(long start, LocalTime time, RandomAccessFile randomAccessFile)	Binary search to find the specified time (to the minute).
protected int	getDefaultTimestampFileIdentificationLineCount()
protected Pattern	getLineTimeIdentificationPattern()
protected int	getNewlineLength()
protected int	getTimeFormatLength()
protected DateTimeFormatter	getTimeFormatter()
protected int	getTimestampFileIdentficationLineCount()
protected boolean	isTimestampedFile(RandomAccessFile raf)

Methods inherited from class java.lang.Object

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

Constructor Details

TimeWindowFileReader

public TimeWindowFileReader()

Method Details

findStartOffset

public long findStartOffset(File file,
 String startTimeString)

findEndOffset

public long findEndOffset(File file,
 String endTimeString,
 long fileStartOffset)

Finds the very last line in _file with the time in the specified minute

Parameters:

fileStartOffset - The start offset (0 if unknown). Usually the output for findStartOffset()

Returns:

The offset of the start of the very last line in a file that is at the specified time

findTimeOffset

protected long findTimeOffset(long start,
 LocalTime time,
 RandomAccessFile randomAccessFile)
                       throws IOException

Binary search to find the specified time (to the minute). A line with the specified time will start at the returned offset, but it may or may not be the first or last line with the specified time. The specified file is expected to be in chronological order. The file pointer location of raf is not guaranteed after this code has run.

Parameters:

start - The start offset.

time - The desired time

randomAccessFile - The file to search (expected to be ordered)

Returns:

An offset in the file that corresponds to the beginning of a line with the specified time to the minute or -1 if not found.. It may or may not be the first or last line with that time.

Throws:

IOException

isTimestampedFile

protected boolean isTimestampedFile(RandomAccessFile raf)
                             throws IOException

Throws:

IOException

getTimestampFileIdentficationLineCount

protected int getTimestampFileIdentficationLineCount()

getDefaultTimestampFileIdentificationLineCount

protected int getDefaultTimestampFileIdentificationLineCount()

getLineTimeIdentificationPattern

protected Pattern getLineTimeIdentificationPattern()

getTimeFormatter

protected DateTimeFormatter getTimeFormatter()

getTimeFormatLength

protected int getTimeFormatLength()

getNewlineLength

protected int getNewlineLength()