org.relique.io

Class FileSetInputStream

java.lang.Object

java.io.InputStream

org.relique.io.FileSetInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class FileSetInputStream
extends InputStream

Class that collapses a set of files into one input stream. All files matching a given pattern are collected, parts of the file name contains part of the data, and the values in the file name are appended (or prepended) to each data line.

Author:

Mario Frasca

Constructor Summary

Constructors

Constructor and Description
FileSetInputStream(String dirName, String fileNamePattern, String[] fieldsInName, String separator, boolean prepend, boolean headerless, CryptoFilter filter, int skipLeadingDataLines)

Method Summary

Modifier and Type	Method and Description
void	close()
int	read() Reads the next byte of data from the input stream.
void	reset()

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, read, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

FileSetInputStream

public FileSetInputStream(String dirName,
                          String fileNamePattern,
                          String[] fieldsInName,
                          String separator,
                          boolean prepend,
                          boolean headerless,
                          CryptoFilter filter,
                          int skipLeadingDataLines)
                   throws IOException

Parameters:

dirName - the containing directory

fileNamePattern - the regular expression describing the file name and the extra fields.

fieldsInName - the names of the fields contained in the file name.

separator - the separator to use when faking output (typically the ",").

prepend - whether the extra fields should precede the ones from the file content.

headerless - if true, then there is no header on first line of file.

filter - filter for decoding bytes read from file.

skipLeadingDataLines - number of lines to skip at start of file before header line.

Throws:

IOException - if a file cannot be opened or read.

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException

read

public int read()
         throws IOException

Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. if the end of the current source file is reached, the next single file is opened. if all input has been used, -1 is returned. to output the tail, we just glue it before each '\n' to output the lead, we have to look ahead and append it to all '\n' that are not followed by '\n' or -1

Specified by:

read in class InputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached.

Throws:

IOException - if an I/O error occurs.

reset

public void reset()
           throws IOException

Overrides:

reset in class InputStream

Throws:

IOException