org.apache.poi.poifs.filesystem

Class DocumentInputStream

java.lang.Object

java.io.InputStream

org.apache.poi.poifs.filesystem.DocumentInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, LittleEndianInput

public final class DocumentInputStream
extends java.io.InputStream
implements LittleEndianInput

This class provides methods to read a DocumentEntry managed by a POIFSFileSystem instance.

Constructor Summary

Constructors

Constructor and Description
DocumentInputStream(DocumentEntry document) Create an InputStream from the specified DocumentEntry
DocumentInputStream(POIFSDocument document) Create an InputStream from the specified Document

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
void	mark(int ignoredReadlimit)
boolean	markSupported() Tests if this input stream supports the mark and reset methods.
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)
byte	readByte()
double	readDouble()
void	readFully(byte[] buf)
void	readFully(byte[] buf, int off, int len)
int	readInt()
long	readLong()
void	readPlain(byte[] buf, int off, int len) Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled
short	readShort()
int	readUByte()
long	readUInt()
int	readUShort()
void	reset() Repositions this stream to the position at the time the mark() method was last called on this input stream.
long	skip(long n)

Methods inherited from class java.lang.Object

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

Constructor Detail

DocumentInputStream

public DocumentInputStream(DocumentEntry document)
                    throws java.io.IOException

Create an InputStream from the specified DocumentEntry

Parameters:

document - the DocumentEntry to be read

Throws:

java.io.IOException - if the DocumentEntry cannot be opened (like, maybe it has been deleted?)

DocumentInputStream

public DocumentInputStream(POIFSDocument document)

Create an InputStream from the specified Document

Parameters:

document - the Document to be read

Method Detail

available

public int available()

Specified by:

available in interface LittleEndianInput

Overrides:

available in class java.io.InputStream

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

markSupported

public boolean markSupported()

Tests if this input stream supports the mark and reset methods.

Overrides:

markSupported in class java.io.InputStream

Returns:

true always

mark

public void mark(int ignoredReadlimit)

Overrides:

mark in class java.io.InputStream

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

reset

public void reset()

Repositions this stream to the position at the time the mark() method was last called on this input stream. If mark() has not been called this method repositions the stream to its beginning.

Overrides:

reset in class java.io.InputStream

skip

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

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

readFully

public void readFully(byte[] buf)

Specified by:

readFully in interface LittleEndianInput

readFully

public void readFully(byte[] buf,
                      int off,
                      int len)

Specified by:

readFully in interface LittleEndianInput

readPlain

public void readPlain(byte[] buf,
                      int off,
                      int len)

Description copied from interface: LittleEndianInput

Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled

Specified by:

readPlain in interface LittleEndianInput

Parameters:

buf - the byte array to receive the bytes

off - the start offset into the byte array

len - the amount of bytes to fill

readByte

public byte readByte()

Specified by:

readByte in interface LittleEndianInput

readDouble

public double readDouble()

Specified by:

readDouble in interface LittleEndianInput

readLong

public long readLong()

Specified by:

readLong in interface LittleEndianInput

readShort

public short readShort()

Specified by:

readShort in interface LittleEndianInput

readInt

public int readInt()

Specified by:

readInt in interface LittleEndianInput

readUInt

public long readUInt()

readUShort

public int readUShort()

Specified by:

readUShort in interface LittleEndianInput

readUByte

public int readUByte()

Specified by:

readUByte in interface LittleEndianInput