org.apache.pdfbox.io

Class RandomAccessBufferedFileInputStream

java.lang.Object

java.io.InputStream

org.apache.pdfbox.io.RandomAccessBufferedFileInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, RandomAccessRead, SequentialRead

public class RandomAccessBufferedFileInputStream
extends java.io.InputStream
implements RandomAccessRead

Provides InputStream access to portions of a file combined with buffered reading of content. Start of next bytes to read can be set via seek method. File is accessed via RandomAccessFile and is read in byte chunks which are cached.

Author:

Timo Boehme (timo.boehme at ontochem com)

Constructor Summary

Constructors

Constructor and Description
RandomAccessBufferedFileInputStream(java.io.File _file) Create input stream instance for given file.

Method Summary

Methods

Modifier and Type	Method and Description
int	available()
void	close() Release resources that are being held.
long	getFilePointer() Deprecated. use getPosition() instead
long	getPosition() Returns offset in file at which next byte would be read.
long	length() The total number of bytes that are available.
int	read() Read a single byte of data.
int	read(byte[] b, int off, int len) Read a buffer of data.
void	seek(long newOffset) Seeks to new position.
long	skip(long n)

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomAccessBufferedFileInputStream

public RandomAccessBufferedFileInputStream(java.io.File _file)
                                    throws java.io.FileNotFoundException,
                                           java.io.IOException

Create input stream instance for given file.

Throws:

java.io.FileNotFoundException

java.io.IOException

Method Detail

getFilePointer

public long getFilePointer()

Deprecated. use getPosition() instead

Returns offset in file at which next byte would be read.

getPosition

public long getPosition()

Returns offset in file at which next byte would be read.

Specified by:

getPosition in interface RandomAccessRead

Returns:

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

seek

public void seek(long newOffset)
          throws java.io.IOException

Seeks to new position. If new position is outside of current page the new page is either taken from cache or read from file and added to cache.

Specified by:

seek in interface RandomAccessRead

Parameters:

newOffset - The position to seek to.

Throws:

java.io.IOException - If there is an error while seeking.

read

public int read()
         throws java.io.IOException

Description copied from interface: SequentialRead

Read a single byte of data.

Specified by:

read in interface SequentialRead

Specified by:

read in class java.io.InputStream

Returns:

The byte of data that is being read.

Throws:

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

read

public int read(byte[] b,
       int off,
       int len)
         throws java.io.IOException

Description copied from interface: SequentialRead

Read a buffer of data.

Specified by:

read in interface SequentialRead

Overrides:

read in class java.io.InputStream

Parameters:

b - The buffer to write the data to.

off - Offset into the buffer to start writing.

len - The amount of data to attempt to read.

Returns:

The number of bytes that were actually read.

Throws:

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

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

length

public long length()
            throws java.io.IOException

Description copied from interface: RandomAccessRead

The total number of bytes that are available.

Specified by:

length in interface RandomAccessRead

Returns:

The number of bytes available.

Throws:

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

close

public void close()
           throws java.io.IOException

Description copied from interface: SequentialRead

Release resources that are being held.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface SequentialRead

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException - If there is an error closing this resource.