Package com.pdftools.sys

Class FileStream

java.lang.Object

com.pdftools.sys.FileStream

All Implemented Interfaces:

Stream, java.lang.AutoCloseable

public class FileStream
extends java.lang.Object
implements Stream

The stream implementation to read from and write to files. This implementation is backed by java.io.RandomAccessFile.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FileStream.Mode	The file access mode.

Constructor Summary

Constructors

Constructor	Description
FileStream(java.io.File file, FileStream.Mode mode)	Create a new file stream from a file.
FileStream(java.io.RandomAccessFile raFile)	Create a new file stream from a RandomAccessFile.
FileStream(java.lang.String filename, FileStream.Mode mode)	Create a new file stream from a file name.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the file stream.
void	copy(Stream stream)	Copy the content from another stream.
long	getLength()	Get the length of the stream in bytes.
java.io.RandomAccessFile	GetRandomAccessFile()	Get the underlying RandomAccessFile.
int	read(byte[] buffer, int offset, int length)	Read from the stream.
boolean	seek(long position)	Set byte position.
void	setLength(long length)	Set the length of the stream in bytes.
long	tell()	Get current byte position.
void	write(byte[] buffer, int offset, int length)	Write to the stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileStream

public FileStream(java.io.File file,
                  FileStream.Mode mode)
           throws java.io.IOException

Create a new file stream from a file. This constructor works similarly to the constructor of the underlying java.io.RandomAccessFile.

Parameters:

file - The file to be opened

mode - The open mode of the file

Throws:

java.io.IOException

See Also:

RandomAccessFile(java.io.File, String)

FileStream

public FileStream(java.lang.String filename,
                  FileStream.Mode mode)
           throws java.io.IOException

Create a new file stream from a file name. This constructor works similarly to the constructor of the underlying java.io.RandomAccessFile.

Parameters:

filename - The name of the file to be opened

mode - The open mode of the file

Throws:

java.io.IOException

See Also:

RandomAccessFile(java.io.File, String)

FileStream

public FileStream(java.io.RandomAccessFile raFile)

Create a new file stream from a RandomAccessFile. ATTENTION: Opening a RandomAccessFile in "rw" mode does not delete the current content of the file, so be sure that you delete it yourself if needed (which is mostly the case).

Parameters:

raFile - The underlying RandomAccessFile

See Also:

RandomAccessFile

Method Detail

GetRandomAccessFile

public java.io.RandomAccessFile GetRandomAccessFile()

Get the underlying RandomAccessFile.

Returns:

The underlying RandomAccessFile

getLength

public long getLength()
               throws java.io.IOException

Get the length of the stream in bytes.

Specified by:

getLength in interface Stream

Returns:

the length of the stream in bytes

Throws:

java.io.IOException

setLength

public void setLength(long length)
               throws java.io.IOException

Set the length of the stream in bytes.

Parameters:

length - the length of the stream in bytes

Throws:

java.io.IOException

seek

public boolean seek(long position)
             throws java.io.IOException

Set byte position.

Specified by:

seek in interface Stream

Parameters:

position - The new position of the stream (-1 for EOS)

Returns:

true if successful

Throws:

java.io.IOException

tell

public long tell()
          throws java.io.IOException

Get current byte position.

Specified by:

tell in interface Stream

Returns:

byte position, -1 if position unknown

Throws:

java.io.IOException

read

public int read(byte[] buffer,
                int offset,
                int length)
         throws java.io.IOException

Read from the stream.

Specified by:

read in interface Stream

Parameters:

buffer - The buffer where the data is written

offset - The starting element in the buffer

length - The maximum number of bytes to be read

Returns:

The actual number of bytes read (-1 if EOS)

Throws:

java.io.IOException

write

public void write(byte[] buffer,
                  int offset,
                  int length)
           throws java.io.IOException

Write to the stream.

Specified by:

write in interface Stream

Parameters:

buffer - The buffer where the data lies

offset - The starting element in the buffer

length - The maximum number of bytes to be written

Throws:

java.io.IOException

copy

public void copy(Stream stream)
          throws java.io.IOException

Copy the content from another stream.

Parameters:

stream - The stream from which the content is copied

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Close the file stream. This closes also the underlying RandomAccessFile.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface Stream

Throws:

java.io.IOException