org.apache.poi.util
Class ByteField

java.lang.Object
  org.apache.poi.util.ByteField

All Implemented Interfaces:

FixedField

public class ByteField
extends java.lang.Object
implements FixedField

representation of a byte (8-bit) field at a fixed location within a byte array

Author:

Marc Johnson (mjohnson at apache dot org

Constructor Summary

ByteField(int offset)
construct the ByteField with its offset into its containing byte array and a default value of 0

ByteField(int offset, byte value)
construct the ByteField with its offset into its containing byte array and initialize its value

ByteField(int offset, byte[] data)
Construct the ByteField with its offset into its containing byte array and initialize its value from its byte array

ByteField(int offset, byte value, byte[] data)
construct the ByteField with its offset into its containing byte array, initialize its value, and write its value to its byte array

Method Summary

byte	get() get the ByteField's current value
void	readFromBytes(byte[] data) set the value from its offset into an array of bytes
void	readFromStream(java.io.InputStream stream) set the value from an InputStream
void	set(byte value) set the ByteField's current value
void	set(byte value, byte[] data) set the ByteField's current value and write it to a byte array
java.lang.String	toString() return the value as a String
void	writeToBytes(byte[] data) write the value out to an array of bytes at the appropriate offset

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteField

public ByteField(int offset)
          throws java.lang.ArrayIndexOutOfBoundsException

construct the ByteField with its offset into its containing byte array and a default value of 0

Parameters:

offset - of the field within its byte array

Throws:

java.lang.ArrayIndexOutOfBoundsException - if offset is negative

ByteField

public ByteField(int offset,
                 byte value)
          throws java.lang.ArrayIndexOutOfBoundsException

construct the ByteField with its offset into its containing byte array and initialize its value

Parameters:

offset - of the field within its byte array

value - the initial value

Throws:

java.lang.ArrayIndexOutOfBoundsException - if offset is negative

ByteField

public ByteField(int offset,
                 byte[] data)
          throws java.lang.ArrayIndexOutOfBoundsException

Construct the ByteField with its offset into its containing byte array and initialize its value from its byte array

Parameters:

offset - of the field within its byte array

data - the byte array to read the value from

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the offset is not within the range of 0..(data.length - 1)

ByteField

public ByteField(int offset,
                 byte value,
                 byte[] data)
          throws java.lang.ArrayIndexOutOfBoundsException

construct the ByteField with its offset into its containing byte array, initialize its value, and write its value to its byte array

Parameters:

offset - of the field within its byte array

value - the initial value

data - the byte array to write the value to

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the offset is not within the range of 0..(data.length - 1)

Method Detail

get

public byte get()

get the ByteField's current value

Returns:

current value

set

public void set(byte value)

set the ByteField's current value

Parameters:

value - to be set

set

public void set(byte value,
                byte[] data)
         throws java.lang.ArrayIndexOutOfBoundsException

set the ByteField's current value and write it to a byte array

Parameters:

value - to be set

data - the byte array to write the value to

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the offset is out of the byte array's range

readFromBytes

public void readFromBytes(byte[] data)
                   throws java.lang.ArrayIndexOutOfBoundsException

set the value from its offset into an array of bytes

Specified by:

readFromBytes in interface FixedField

Parameters:

data - the byte array from which the value is to be read

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the offset is out of range of the bte array

readFromStream

public void readFromStream(java.io.InputStream stream)
                    throws java.io.IOException,
                           LittleEndian.BufferUnderrunException

set the value from an InputStream

Specified by:

readFromStream in interface FixedField

Parameters:

stream - the InputStream from which the value is to be read

Throws:

LittleEndian.BufferUnderrunException - if there is not enough data available from the InputStream

java.io.IOException - if an IOException is thrown from reading the InputStream

writeToBytes

public void writeToBytes(byte[] data)
                  throws java.lang.ArrayIndexOutOfBoundsException

write the value out to an array of bytes at the appropriate offset

Specified by:

writeToBytes in interface FixedField

Parameters:

data - the array of bytes to which the value is to be written

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the offset is out of the byte array's range

toString

public java.lang.String toString()

return the value as a String

Specified by:

toString in interface FixedField

Overrides:

toString in class java.lang.Object

Returns:

the value as a String