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java.lang.Objectuk.ac.starlink.fits.SimpleMappedInput
public class SimpleMappedInput
Random-access BasicInput implementation that maps a given region of a file as a monolithic byte buffer. On close, an attempt is made to unmap the buffer.
Note: DO NOT use an instance
of this class from multiple threads - see Unmapper
.
Constructor Summary | |
---|---|
SimpleMappedInput(java.nio.channels.FileChannel chan,
long pos,
int size,
java.lang.String logName)
Constructor. |
Method Summary | |
---|---|
void |
close()
Releases resources belonging to this object. |
long |
getOffset()
Returns the curent position in this stream (optional operation). |
boolean |
isRandom()
Indicates whether this object supports random access. |
byte |
readByte()
Reads a byte from the stream. |
double |
readDouble()
Reads an 8-byte floating point value from the stream. |
float |
readFloat()
Reads a 4-byte floating point value from the stream. |
int |
readInt()
Reads a 4-byte integer from the stream. |
long |
readLong()
Reads an 8-byte integer from the stream. |
short |
readShort()
Reads a 2-byte integer from the stream. |
void |
seek(long pos)
Moves the current position of this stream to a given byte offset (optional operation). |
void |
skip(long nbyte)
Skips a given number of bytes forwards through the stream. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SimpleMappedInput(java.nio.channels.FileChannel chan, long pos, int size, java.lang.String logName) throws java.io.IOException
chan
- file channel, preferably read-onlypos
- offset into file of stream startsize
- number of bytes in streamlogName
- name for mapped region used in logging messages
java.io.IOException
Method Detail |
---|
public boolean isRandom()
BasicInput
isRandom
in interface BasicInput
public void seek(long pos) throws java.io.EOFException
BasicInput
seek
in interface BasicInput
java.io.EOFException
public long getOffset()
BasicInput
getOffset
in interface BasicInput
public void skip(long nbyte) throws java.io.IOException
BasicInput
skip
in interface BasicInput
nbyte
- number of bytes to skip
java.io.IOException
public byte readByte() throws java.io.EOFException
BasicInput
readByte
in interface BasicInput
java.io.EOFException
public short readShort() throws java.io.EOFException
BasicInput
readShort
in interface BasicInput
java.io.EOFException
public int readInt() throws java.io.EOFException
BasicInput
readInt
in interface BasicInput
java.io.EOFException
public long readLong() throws java.io.EOFException
BasicInput
readLong
in interface BasicInput
java.io.EOFException
public float readFloat() throws java.io.EOFException
BasicInput
readFloat
in interface BasicInput
java.io.EOFException
public double readDouble() throws java.io.EOFException
BasicInput
readDouble
in interface BasicInput
java.io.EOFException
public void close()
BasicInput
close
in interface BasicInput
|
Copyright © 2004 CLRC: Central Laboratory of the Research Councils. All rights reserved. | ||||||||
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