ucar.unidata.io.http
Class HTTPRandomAccessFile

java.lang.Object
  ucar.unidata.io.RandomAccessFile
      ucar.unidata.io.http.HTTPRandomAccessFile

All Implemented Interfaces:

DataInput, DataOutput

public class HTTPRandomAccessFile
extends RandomAccessFile

Gives access to files over HTTP, using jakarta commons HttpClient library. This version uses a single instance of HttpClient, following performance guidelines at http://jakarta.apache.org/commons/httpclient/performance.html Plus other improvements.

Author:

John Caron

Field Summary

static int

defaultHTTPBufferSize

Fields inherited from class ucar.unidata.io.RandomAccessFile

allFiles, BIG_ENDIAN, bigEndian, buffer, bufferStart, dataEnd, dataSize, debugAccess, debugLeaks, defaultBufferSize, endOfFile, file, fileChannel, filePosition, LITTLE_ENDIAN, location, openFiles, readonly, showOpen, showRead

Constructor Summary

HTTPRandomAccessFile(String url)

HTTPRandomAccessFile(String url, int bufferSize)

Method Summary

void	close()
long	length()
protected int	read_(long pos, byte[] buff, int offset, int len) Read directly from file, without going through the buffer.
long	readToByteChannel(WritableByteChannel dest, long offset, long nbytes)

Methods inherited from class ucar.unidata.io.RandomAccessFile

flush, getAllFiles, getBufferSize, getDebugLeaks, getDebugNbytes, getDebugNseeks, getFD, getFilePointer, getLocation, getOpenFiles, getRandomAccessFile, isAtEndOfFile, order, read, read, read, readBoolean, readBuffer, readByte, readBytes, readBytes, readChar, readDouble, readDouble, readFloat, readFloat, readFully, readFully, readInt, readInt, readIntUnbuffered, readLine, readLong, readLong, readShort, readShort, readString, readUnsignedByte, readUnsignedShort, readUTF, searchForward, seek, setBufferSize, setDebugAccess, setDebugLeaks, setExtendMode, setMinLength, skipBytes, toString, unread, write, write, write, writeBoolean, writeBoolean, writeByte, writeBytes, writeBytes, writeBytes, writeChar, writeChar, writeChars, writeDouble, writeDouble, writeFloat, writeFloat, writeInt, writeInt, writeLong, writeLong, writeShort, writeShort, writeUTF

Methods inherited from class java.lang.Object

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

Field Detail

defaultHTTPBufferSize

public static int defaultHTTPBufferSize

Constructor Detail

HTTPRandomAccessFile

public HTTPRandomAccessFile(String url)
                     throws IOException

Throws:

IOException

HTTPRandomAccessFile

public HTTPRandomAccessFile(String url,
                            int bufferSize)
                     throws IOException

Throws:

IOException

Method Detail

close

public void close()

Overrides:

close in class RandomAccessFile

read_

protected int read_(long pos,
                    byte[] buff,
                    int offset,
                    int len)
             throws IOException

Read directly from file, without going through the buffer. All reading goes through here or readToByteChannel;

Overrides:

read_ in class RandomAccessFile

Parameters:

pos - start here in the file

buff - put data into this buffer

offset - buffer offset

len - this number of bytes

Returns:

actual number of bytes read

Throws:

IOException - on io error

readToByteChannel

public long readToByteChannel(WritableByteChannel dest,
                              long offset,
                              long nbytes)
                       throws IOException

Overrides:

readToByteChannel in class RandomAccessFile

Throws:

IOException

length

public long length()
            throws IOException

Overrides:

length in class RandomAccessFile

Throws:

IOException