org.apache.pdfbox.io

Class RandomAccessReadMemoryMappedFile

java.lang.Object

org.apache.pdfbox.io.RandomAccessReadMemoryMappedFile

All Implemented Interfaces:

Closeable, AutoCloseable, RandomAccessRead

public class RandomAccessReadMemoryMappedFile
extends Object
implements RandomAccessRead

An implementation of the RandomAccess interface backed by a memory mapped file channel. The whole file is mapped to memory and the max size is limited to Integer.MAX_VALUE.

Constructor Summary

Constructors

Constructor and Description
RandomAccessReadMemoryMappedFile(File file) Default constructor.
RandomAccessReadMemoryMappedFile(String filename) Default constructor.

Method Summary

Modifier and Type	Method and Description
void	close()
RandomAccessReadView	createView(long startPosition, long streamLength) Creates a random access read view starting at the given position with the given length.
long	getPosition() Returns offset of next byte to be returned by a read method.
boolean	isClosed() Returns true if this source has been closed.
boolean	isEOF() A simple test to see if we are at the end of the data.
long	length() The total number of bytes that are available.
int	read() Read a single byte of data.
int	read(byte[] b, int offset, int length) Read a buffer of data.
void	seek(long position) Seek to a position in the data.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pdfbox.io.RandomAccessRead

available, peek, read, rewind, skip

Constructor Detail

RandomAccessReadMemoryMappedFile

public RandomAccessReadMemoryMappedFile(String filename)
                                 throws IOException

Default constructor.

Parameters:

filename - the filename of the file to be read

Throws:

IOException - If there is an IO error opening the file.

RandomAccessReadMemoryMappedFile

public RandomAccessReadMemoryMappedFile(File file)
                                 throws IOException

Default constructor.

Parameters:

file - the file to be read

Throws:

IOException - If there is an IO error opening the file.

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

seek

public void seek(long position)
          throws IOException

Seek to a position in the data.

Specified by:

seek in interface RandomAccessRead

Parameters:

position - The position to seek to.

Throws:

IOException - If there is an error while seeking.

getPosition

public long getPosition()
                 throws IOException

Returns offset of next byte to be returned by a read method.

Specified by:

getPosition in interface RandomAccessRead

Returns:

offset of next byte which will be returned with next RandomAccessRead.read() (if no more bytes are left it returns a value >= length of source)

Throws:

IOException - If there was an error while getting the current position

read

public int read()
         throws IOException

Read a single byte of data.

Specified by:

read in interface RandomAccessRead

Returns:

The byte of data that is being read.

Throws:

IOException - If there is an error while reading the data.

read

public int read(byte[] b,
                int offset,
                int length)
         throws IOException

Read a buffer of data.

Specified by:

read in interface RandomAccessRead

Parameters:

b - The buffer to write the data to.

offset - Offset into the buffer to start writing.

length - The amount of data to attempt to read.

Returns:

The number of bytes that were actually read.

Throws:

IOException - If there was an error while reading the data.

length

public long length()
            throws IOException

The total number of bytes that are available.

Specified by:

length in interface RandomAccessRead

Returns:

The number of bytes available.

Throws:

IOException - If there is an IO error while determining the length of the data stream.

isClosed

public boolean isClosed()

Returns true if this source has been closed.

Specified by:

isClosed in interface RandomAccessRead

Returns:

true if the source has been closed

isEOF

public boolean isEOF()
              throws IOException

A simple test to see if we are at the end of the data.

Specified by:

isEOF in interface RandomAccessRead

Returns:

true if we are at the end of the data.

Throws:

IOException - If there is an error reading the next byte.

createView

public RandomAccessReadView createView(long startPosition,
                                       long streamLength)

Description copied from interface: RandomAccessRead

Creates a random access read view starting at the given position with the given length.

Specified by:

createView in interface RandomAccessRead

Parameters:

startPosition - start position within the underlying random access read

streamLength - stream length

Returns:

the random access read view