public class RandomAccessViewport extends RandomAccessFilter
IRandomAccess.random| Constructor and Description |
|---|
RandomAccessViewport(IRandomAccess ra,
long offset,
long length)
Create a viewport to the existing
IRandomAccess ra. |
| Modifier and Type | Method and Description |
|---|---|
long |
getLength()
Returns the length of this data container.
|
long |
getOffset()
Returns the current offset in this data container.
|
protected long |
getViewEnd() |
protected long |
getViewLength() |
protected long |
getViewOffset() |
boolean |
isReadOnly()
true if this is a read only data container. |
int |
read()
Reads a byte of data from this data container.
|
int |
read(byte[] buffer)
Reads up to
buffer.length bytes of data from this data
container into an array of bytes. |
int |
read(byte[] buffer,
int start,
int numBytes)
Reads up to
len bytes of data from this data container into
an array of bytes. |
void |
seek(long offset)
Sets the offset, measured from the beginning of the data container at
which the next read or write occurs.
|
void |
seekBy(long delta)
Sets the offset, measured from the current offset at which the next read
or write occurs.
|
void |
setLength(long newLength)
Assign the length.
|
void |
write(byte[] buffer)
Writes
b.length bytes from the specified byte array,
starting at the current offset. |
void |
write(byte[] buffer,
int start,
int numBytes)
Writes
len bytes from the specified byte array starting at
start. |
void |
write(int b)
Writes the specified byte .
|
close, flush, getRandomasInputStream, asOutputStream, getPositionStack, mark, resetpublic RandomAccessViewport(IRandomAccess ra, long offset, long length) throws java.io.IOException
IRandomAccess ra.
ATTENTION: This will not seek to offset in ra.
This means after creation before initial use you have to position the
IRandomAccess yourself using seek.
ra - offset - length - java.io.IOExceptionpublic long getLength()
throws java.io.IOException
IRandomAccessgetLength in interface IRandomAccessgetLength in class RandomAccessFilterjava.io.IOException - if an I/O error occurs.public long getOffset()
throws java.io.IOException
IRandomAccessgetOffset in interface IRandomAccessgetOffset in class RandomAccessFilterjava.io.IOException - if an I/O error occurs.protected long getViewEnd()
protected long getViewLength()
protected long getViewOffset()
public boolean isReadOnly()
IRandomAccesstrue if this is a read only data container.isReadOnly in interface IRandomAccessisReadOnly in class RandomAccessFiltertrue if this is a read only data container.public int read()
throws java.io.IOException
IRandomAccess0x00-0x0ff). This method
blocks if no input is yet available.
This method behaves in exactly the same way as the
InputStream.read() method of InputStream.
read in interface IRandomAccessread in class RandomAccessFilter-1 if the end of the data
container has been reached.java.io.IOException - if an I/O error occurs. Not thrown if the end of the data
container has been reached.public int read(byte[] buffer)
throws java.io.IOException
IRandomAccessbuffer.length bytes of data from this data
container into an array of bytes. This method blocks until at least one
byte of input is available.
This method behaves in the exactly the same way as the
InputStream.read(byte[]) method of InputStream.
read in interface IRandomAccessread in class RandomAccessFilterbuffer - the buffer into which the data is read.-1 if there is no more data because the end of this
data container has been reached.java.io.IOException - if an I/O error occurs.public int read(byte[] buffer,
int start,
int numBytes)
throws java.io.IOException
IRandomAccesslen bytes of data from this data container into
an array of bytes. This method blocks until at least one byte of input is
available.
read in interface IRandomAccessread in class RandomAccessFilterbuffer - the buffer into which the data is read.start - the start offset of the data.numBytes - the maximum number of bytes read.-1 if there is no more data because the end of the
file has been reached.java.io.IOException - if an I/O error occurs.public void seek(long offset)
throws java.io.IOException
IRandomAccessseek in interface IRandomAccessseek in class RandomAccessFilteroffset - the offset position, measured in bytes from the beginning of
the data containerjava.io.IOException - if offset is less than 0 or if
an I/O error occurs.public void seekBy(long delta)
throws java.io.IOException
IRandomAccessseekBy in interface IRandomAccessseekBy in class RandomAccessFilterdelta - the amount of bytes by which to change the current offset
positionjava.io.IOException - if the resulting offset is less than
0 or if an I/O error occurs.public void setLength(long newLength)
throws java.io.IOException
IRandomAccesssetLength in interface IRandomAccesssetLength in class RandomAccessFilterjava.io.IOExceptionpublic void write(byte[] buffer)
throws java.io.IOException
IRandomAccessb.length bytes from the specified byte array,
starting at the current offset.write in interface IRandomAccesswrite in class RandomAccessFilterbuffer - the data.java.io.IOException - if an I/O error occurs.public void write(byte[] buffer,
int start,
int numBytes)
throws java.io.IOException
IRandomAccesslen bytes from the specified byte array starting at
start.write in interface IRandomAccesswrite in class RandomAccessFilterbuffer - the data.start - the start offset in the data.numBytes - the number of bytes to write.java.io.IOException - if an I/O error occurs.public void write(int b)
throws java.io.IOException
IRandomAccesswrite in interface IRandomAccesswrite in class RandomAccessFilterb - the byte to be written.java.io.IOException - if an I/O error occurs.