com.bbn.openmap.io
Class BinaryBufferedFile

java.lang.Object
  com.bbn.openmap.io.BinaryFile
      com.bbn.openmap.io.BinaryBufferedFile

public class BinaryBufferedFile
extends BinaryFile

This class extends the BinaryFile class, doing buffered reads on the underlying input file. The buffer size is not modifiable after construction, and the buffer management isn't the greatest.

Field Summary

Fields inherited from class com.bbn.openmap.io.BinaryFile

MSBFirst

Constructor Summary

BinaryBufferedFile(java.io.File f)
Constructs a BinaryBufferedFile with a File

BinaryBufferedFile(java.io.File f, int buffersize)
Constructs a BinaryBufferedFile with a File and a buffer size

BinaryBufferedFile(java.lang.String name)
Constructs a BinaryBufferedFile with a filename

BinaryBufferedFile(java.lang.String name, int buffersize)
Constructs a BinaryBufferedFile with a filename and a buffersize

Method Summary

long	available() Return how many bytes left to be read in the file.
static BinaryBufferedFile	create(java.lang.String name) A simple factory method that lets you try to create something without having to really deal with failure.
static BinaryBufferedFile	create(java.lang.String name, int buffersize) A simple factory method that lets you try to create something without having to really deal with failure.
void	dispose() Disposes the underlying file input, and releases some resources of the class.
long	getFilePointer() Get the index of the next character to be read
int	read() Read from the file.
int	read(byte[] b) Read from the file.
int	read(byte[] b, int off, int len) Read from the file
byte[]	readBytes(int howmany, boolean allowless) Read from the file.
char	readChar() Reads and returns a single byte, cast to a char.
java.lang.String	readFixedLengthString(int length) Reads length bytes and returns a string composed of the bytes cast to chars.
void	readFloatArray(float[] vec, int offset, int len) Reads an array of floats from the input.
int	readInteger() Reads and returns a long.
void	readIntegerArray(int[] vec, int offset, int len) Reads an array of integers.
long	readLong() Reads and returns a long.
short	readShort() Reads and returns a short.
void	readShortArray(short[] vec, int offset, int len) Reads an array of shorts.
int	readUnsignedShort() Reads and returns a integer from 2 bytes.
void	seek(long pos) Set the index of the next character to be read.
void	setInputReader(InputReader reader) Set the input reader used by the BinaryFile.
long	skipBytes(long n) Skip over n bytes in the input file

Methods inherited from class com.bbn.openmap.io.BinaryFile

addClosable, assertChar, byteOrder, byteOrder, close, closeClosable, exists, finalize, getInputReader, getName, length, readDouble, readFloat, readFloatArray, readFully, readShortData, readToDelimiter, readUnsigned, removeClosable, setJarInputReader

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryBufferedFile

public BinaryBufferedFile(java.io.File f,
                          int buffersize)
                   throws java.io.IOException

Constructs a BinaryBufferedFile with a File and a buffer size

Parameters:

f - the input file

buffersize - the size to use for buffering reads

Throws:

java.io.IOException - pass-through errors from opening a BinaryFile with f

See Also:

BinaryFile

BinaryBufferedFile

public BinaryBufferedFile(java.io.File f)
                   throws java.io.IOException

Constructs a BinaryBufferedFile with a File

Parameters:

f - the input file

Throws:

java.io.IOException - pass-through errors from opening a BinaryFile with f

See Also:

BinaryFile

BinaryBufferedFile

public BinaryBufferedFile(java.lang.String name,
                          int buffersize)
                   throws java.io.IOException

Constructs a BinaryBufferedFile with a filename and a buffersize

Parameters:

name - the name/path of the input file

buffersize - the size to use for buffering reads

Throws:

java.io.IOException - pass-through errors from opening a BinaryFile with f

See Also:

BinaryFile

BinaryBufferedFile

public BinaryBufferedFile(java.lang.String name)
                   throws java.io.IOException

Constructs a BinaryBufferedFile with a filename

Parameters:

name - the name/path of the input file

Throws:

java.io.IOException - pass-through errors from opening a BinaryFile with f

See Also:

BinaryFile

Method Detail

create

public static BinaryBufferedFile create(java.lang.String name)

A simple factory method that lets you try to create something without having to really deal with failure. Returns a BinaryFile if successful, null if not.

create

public static BinaryBufferedFile create(java.lang.String name,
                                        int buffersize)

A simple factory method that lets you try to create something without having to really deal with failure. Returns a BinaryFile if successful, null if not.

setInputReader

public void setInputReader(InputReader reader)

Set the input reader used by the BinaryFile. Make sure it's initialized properly. Assumes that the pointer is at the beginning of the file.

Overrides:

setInputReader in class BinaryFile

skipBytes

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

Description copied from class: BinaryFile

Skip over n bytes in the input file

Overrides:

skipBytes in class BinaryFile

Parameters:

n - the number of bytes to skip

Returns:

the actual number of bytes skipped. annoying, isn't it?

Throws:

java.io.IOException - Any IO errors that occur in skipping bytes in the underlying file

getFilePointer

public long getFilePointer()
                    throws java.io.IOException

Description copied from class: BinaryFile

Get the index of the next character to be read

Overrides:

getFilePointer in class BinaryFile

Returns:

the index

Throws:

java.io.IOException - Any IO errors that occur in accessing the underlying file

seek

public void seek(long pos)
          throws java.io.IOException

Description copied from class: BinaryFile

Set the index of the next character to be read.

Overrides:

seek in class BinaryFile

Parameters:

pos - the position to seek to.

Throws:

java.io.IOException - Any IO Errors that occur in seeking the underlying file.

available

public long available()
               throws java.io.IOException

Description copied from class: BinaryFile

Return how many bytes left to be read in the file.

Overrides:

available in class BinaryFile

Returns:

the number of bytes remaining to be read (counted in bytes)

Throws:

java.io.IOException - Any IO errors encountered in accessing the file

dispose

public void dispose()
             throws java.io.IOException

Disposes the underlying file input, and releases some resources of the class. Calling any other members after this one will return bogus results.

Overrides:

dispose in class BinaryFile

Throws:

java.io.IOException - IO errors encountered in closing the file

read

public int read()
         throws java.io.IOException

Description copied from class: BinaryFile

Read from the file.

Overrides:

read in class BinaryFile

Returns:

one byte from the file. -1 for EOF

Throws:

java.io.IOException - Any IO errors encountered in reading from the file

read

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

Read from the file

Overrides:

read in class BinaryFile

Parameters:

b - The byte array to read into

off - the first array position to read into

len - the number of bytes to read

Returns:

the number of bytes read

Throws:

java.io.IOException - Any IO errors encountered in reading from the file

read

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

Description copied from class: BinaryFile

Read from the file.

Overrides:

read in class BinaryFile

Parameters:

b - the byte array to read into. Equivalent to read(b, 0, b.length)

Returns:

the number of bytes read

Throws:

java.io.IOException - Any IO errors encountered in reading from the file

See Also:

RandomAccessFile.read(byte[])

readBytes

public byte[] readBytes(int howmany,
                        boolean allowless)
                 throws java.io.EOFException,
                        FormatException

Read from the file.

Overrides:

readBytes in class BinaryFile

Parameters:

howmany - the number of bytes to read

allowless - if we can return fewer bytes than requested

Returns:

the array of bytes read.

Throws:

FormatException - Any IO Exceptions, plus an end-of-file encountered after reading some, but now enough, bytes when allowless was false

java.io.EOFException - Encountered an end-of-file while allowless was false, but NO bytes had been read.

readChar

public char readChar()
              throws java.io.EOFException,
                     FormatException

Reads and returns a single byte, cast to a char.

Overrides:

readChar in class BinaryFile

Returns:

the byte read from the file, cast to a char

Throws:

java.io.EOFException - the end-of-file has been reached, so no chars where available

FormatException - a rethrown IOException

readShort

public short readShort()
                throws java.io.EOFException,
                       FormatException

Reads and returns a short.

Overrides:

readShort in class BinaryFile

Returns:

the 2 bytes merged into a short, according to the current byte ordering

Throws:

java.io.EOFException - there were less than 2 bytes left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the short

See Also:

read(byte[])

readUnsignedShort

public int readUnsignedShort()
                      throws java.io.EOFException,
                             FormatException

Reads and returns a integer from 2 bytes.

Overrides:

readUnsignedShort in class BinaryFile

Returns:

the 2 bytes merged into a short, according to the current byte ordering, and then unsigned to int.

Throws:

java.io.EOFException - there were less than 2 bytes left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the short

See Also:

read(byte[])

readShortArray

public void readShortArray(short[] vec,
                           int offset,
                           int len)
                    throws java.io.EOFException,
                           FormatException

Reads an array of shorts.

Parameters:

vec - the array to write the shorts into

offset - the first array index to write to

len - the number of shorts to read

Throws:

java.io.EOFException - there were fewer bytes than needed in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the array

readInteger

public int readInteger()
                throws java.io.EOFException,
                       FormatException

Reads and returns a long.

Overrides:

readInteger in class BinaryFile

Returns:

the 4 bytes merged into a long, according to the current byte ordering

Throws:

java.io.EOFException - there were less than 4 bytes left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the integer

See Also:

BinaryFile.read(byte[])

readIntegerArray

public void readIntegerArray(int[] vec,
                             int offset,
                             int len)
                      throws java.io.EOFException,
                             FormatException

Reads an array of integers.

Overrides:

readIntegerArray in class BinaryFile

Throws:

java.io.EOFException - there were fewer bytes than needed in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the array

readFloatArray

public void readFloatArray(float[] vec,
                           int offset,
                           int len)
                    throws java.io.EOFException,
                           FormatException

Reads an array of floats from the input.

Overrides:

readFloatArray in class BinaryFile

Parameters:

vec - the vector to read into

offset - the first float read goes into vec[offset]

len - the number of floats to read from the stream

Throws:

java.io.EOFException - not enough bytes were left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the integer

readLong

public long readLong()
              throws java.io.EOFException,
                     FormatException

Reads and returns a long.

Overrides:

readLong in class BinaryFile

Returns:

the 8 bytes merged into a long, according to the current byte ordering

Throws:

java.io.EOFException - there were less than 8 bytes left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the long

See Also:

read(byte[])

readFixedLengthString

public java.lang.String readFixedLengthString(int length)
                                       throws java.io.EOFException,
                                              FormatException

Reads length bytes and returns a string composed of the bytes cast to chars.

Overrides:

readFixedLengthString in class BinaryFile

Parameters:

length - the number of bytes to read into the string

Returns:

the composed string

Throws:

java.io.EOFException - there were less than length bytes left in the file

FormatException - rethrow of IOExceptions encountered while reading the bytes for the short