Package org.apache.commons.vfs2.provider.ram

Class RamFileRandomAccessContent

java.lang.Object

org.apache.commons.vfs2.provider.ram.RamFileRandomAccessContent

All Implemented Interfaces:

Closeable, DataInput, DataOutput, AutoCloseable, RandomAccessContent

public class RamFileRandomAccessContent
extends Object
implements RandomAccessContent

RAM File Random Access Content.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	filePointer	File Pointer

Constructor Summary

Constructors

Constructor	Description
RamFileRandomAccessContent(RamFileObject file, RandomAccessMode mode)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this random access file stream and releases any system resources associated with the stream.
long	getFilePointer()	Returns the current offset in this file.
InputStream	getInputStream()	Gets the input stream.
long	length()	Returns the length of this file.
boolean	readBoolean()
byte	readByte()
char	readChar()
double	readDouble()
float	readFloat()
void	readFully(byte[] b)
void	readFully(byte[] b, int off, int len)
int	readInt()
String	readLine()
long	readLong()
short	readShort()
int	readUnsignedByte()
int	readUnsignedShort()
String	readUTF()
void	seek(long pos)	Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.
void	setLength(long newLength)	Sets the length of this content.
int	skipBytes(int n)
static byte[]	toBytes(long n, byte[] b)	Build an 8-byte array from a long.
static long	toLong(byte[] b)	Build a long from first 8 bytes of the array.
static short	toShort(byte[] b)	Build a short from first 2 bytes of the array.
static int	toUnsignedShort(byte[] b)	Build a short from first 2 bytes of the array.
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writeBoolean(boolean v)
void	writeByte(int i)
void	writeBytes(String s)
void	writeChar(int v)
void	writeChars(String s)
void	writeDouble(double v)
void	writeFloat(float v)
void	writeInt(int v)
void	writeLong(long v)
void	writeShort(int v)
void	writeUTF(String str)

Methods inherited from class java.lang.Object

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

Field Details

filePointer

protected int filePointer

File Pointer

Constructor Details

RamFileRandomAccessContent

public RamFileRandomAccessContent(RamFileObject file,
 RandomAccessMode mode)

Constructs a new instance.

Parameters:

file - The file to access.

mode - The access mode.

Method Details

toBytes

public static byte[] toBytes(long n,
 byte[] b)

Build an 8-byte array from a long. No check is performed on the array length.

Parameters:

n - The number to convert.

b - The array to fill.

Returns:

A byte[].

toLong

public static long toLong(byte[] b)

Build a long from first 8 bytes of the array.

Parameters:

b - The byte[] to convert.

Returns:

A long.

toShort

public static short toShort(byte[] b)

Build a short from first 2 bytes of the array.

Parameters:

b - The byte[] to convert.

Returns:

A short.

toUnsignedShort

public static int toUnsignedShort(byte[] b)

Build a short from first 2 bytes of the array.

Parameters:

b - The byte[] to convert.

Returns:

A short.

close

public void close()
           throws IOException

Description copied from interface: RandomAccessContent

Closes this random access file stream and releases any system resources associated with the stream.

A closed random access file cannot perform input or output operations and cannot be reopened.

If this file has an associated channel then the channel is closed as well.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface RandomAccessContent

Throws:

IOException - if an I/O error occurs.

getFilePointer

public long getFilePointer()
                    throws IOException

Description copied from interface: RandomAccessContent

Returns the current offset in this file.

Specified by:

getFilePointer in interface RandomAccessContent

Returns:

the offset from the beginning of the file, in bytes, at which the next read or write occurs.

Throws:

IOException - if an I/O error occurs.

getInputStream

public InputStream getInputStream()
                           throws IOException

Description copied from interface: RandomAccessContent

Gets the input stream.

Notice: If you use RandomAccessContent.seek(long) you have to re-get the InputStream

Specified by:

getInputStream in interface RandomAccessContent

Returns:

the InputStream.

Throws:

IOException - if an I/O error occurs.

length

public long length()
            throws IOException

Description copied from interface: RandomAccessContent

Returns the length of this file.

Specified by:

length in interface RandomAccessContent

Returns:

the length of this file, measured in bytes.

Throws:

IOException - if an I/O error occurs.

readBoolean

public boolean readBoolean()
                    throws IOException

Specified by:

readBoolean in interface DataInput

Throws:

IOException

readByte

public byte readByte()
              throws IOException

Specified by:

readByte in interface DataInput

Throws:

IOException

readChar

public char readChar()
              throws IOException

Specified by:

readChar in interface DataInput

Throws:

IOException

readDouble

public double readDouble()
                  throws IOException

Specified by:

readDouble in interface DataInput

Throws:

IOException

readFloat

public float readFloat()
                throws IOException

Specified by:

readFloat in interface DataInput

Throws:

IOException

readFully

public void readFully(byte[] b)
               throws IOException

Specified by:

readFully in interface DataInput

Throws:

IOException

readFully

public void readFully(byte[] b,
 int off,
 int len)
               throws IOException

Specified by:

readFully in interface DataInput

Throws:

IOException

readInt

public int readInt()
            throws IOException

Specified by:

readInt in interface DataInput

Throws:

IOException

readLine

public String readLine()
                throws IOException

Specified by:

readLine in interface DataInput

Throws:

IOException

readLong

public long readLong()
              throws IOException

Specified by:

readLong in interface DataInput

Throws:

IOException

readShort

public short readShort()
                throws IOException

Specified by:

readShort in interface DataInput

Throws:

IOException

readUnsignedByte

public int readUnsignedByte()
                     throws IOException

Specified by:

readUnsignedByte in interface DataInput

Throws:

IOException

readUnsignedShort

public int readUnsignedShort()
                      throws IOException

Specified by:

readUnsignedShort in interface DataInput

Throws:

IOException

readUTF

public String readUTF()
               throws IOException

Specified by:

readUTF in interface DataInput

Throws:

IOException

seek

public void seek(long pos)
          throws IOException

Description copied from interface: RandomAccessContent

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

The offset may be set beyond the end of the file. Setting the offset beyond the end of the file does not change the file length. The file length will change only by writing after the offset has been set beyond the end of the file.

Notice: If you use RandomAccessContent.getInputStream() you have to re-get the InputStream after calling RandomAccessContent.seek(long)

Specified by:

seek in interface RandomAccessContent

Parameters:

pos - the offset position, measured in bytes from the beginning of the file, at which to set the file pointer.

Throws:

IOException - if pos is less than 0 or if an I/O error occurs.

setLength

public void setLength(long newLength)
               throws IOException

Description copied from interface: RandomAccessContent

Sets the length of this content.

If the newLength argument is smaller than RandomAccessContent.length(), the content is truncated.

If the newLength argument is greater than RandomAccessContent.length(), the content grows with undefined data.

Specified by:

setLength in interface RandomAccessContent

Parameters:

newLength - The desired content length

Throws:

IOException - If an I/O error occurs

skipBytes

public int skipBytes(int n)
              throws IOException

Specified by:

skipBytes in interface DataInput

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Specified by:

write in interface DataOutput

Throws:

IOException

write

public void write(byte[] b,
 int off,
 int len)
           throws IOException

Specified by:

write in interface DataOutput

Throws:

IOException

write

public void write(int b)
           throws IOException

Specified by:

write in interface DataOutput

Throws:

IOException

writeBoolean

public void writeBoolean(boolean v)
                  throws IOException

Specified by:

writeBoolean in interface DataOutput

Throws:

IOException

writeByte

public void writeByte(int i)
               throws IOException

Specified by:

writeByte in interface DataOutput

Throws:

IOException

writeBytes

public void writeBytes(String s)
                throws IOException

Specified by:

writeBytes in interface DataOutput

Throws:

IOException

writeChar

public void writeChar(int v)
               throws IOException

Specified by:

writeChar in interface DataOutput

Throws:

IOException

writeChars

public void writeChars(String s)
                throws IOException

Specified by:

writeChars in interface DataOutput

Throws:

IOException

writeDouble

public void writeDouble(double v)
                 throws IOException

Specified by:

writeDouble in interface DataOutput

Throws:

IOException

writeFloat

public void writeFloat(float v)
                throws IOException

Specified by:

writeFloat in interface DataOutput

Throws:

IOException

writeInt

public void writeInt(int v)
              throws IOException

Specified by:

writeInt in interface DataOutput

Throws:

IOException

writeLong

public void writeLong(long v)
               throws IOException

Specified by:

writeLong in interface DataOutput

Throws:

IOException

writeShort

public void writeShort(int v)
                throws IOException

Specified by:

writeShort in interface DataOutput

Throws:

IOException

writeUTF

public void writeUTF(String str)
              throws IOException

Specified by:

writeUTF in interface DataOutput

Throws:

IOException