com.tangosol.io
Class AbstractWriteBuffer.AbstractBufferOutput

java.lang.Object
  com.tangosol.io.AbstractWriteBuffer.AbstractBufferOutput

All Implemented Interfaces:

OutputStreaming, WriteBuffer.BufferOutput, DataOutput

Direct Known Subclasses:

ByteArrayWriteBuffer.ByteArrayBufferOutput, ByteBufferWriteBuffer.ByteBufferOutput, DelegatingWriteBuffer.DelegatingBufferOutput, MultiBufferWriteBuffer.MultiBufferOutput

Enclosing class:

AbstractWriteBuffer

public class AbstractWriteBuffer.AbstractBufferOutput
extends Object
implements WriteBuffer.BufferOutput

AbstractBufferOutput is a concrete implementation of BufferOutput for the non-concrete AbstractWriteBuffer implementation.

Author:

cp 2005.03.24

Field Summary

protected int

m_ofWrite Current write offset within the containing WriteBuffer.

Constructor Summary

AbstractWriteBuffer.AbstractBufferOutput()
Construct an AbstractBufferOutput that will begin writing at the start of the containing WriteBuffer.

AbstractWriteBuffer.AbstractBufferOutput(int of)
Construct an AbstractBufferOutput that will begin writing at the specified offset within the containing WriteBuffer.

Method Summary

protected int	calcUTF(String s) Figure out how many bytes it will take to hold the passed String.
void	close() Close the OutputStream and release any system resources associated with it.
void	flush() Flushes this OutputStream and forces any buffered output bytes to be written.
protected void	formatUTF(byte[] ab, int ofb, int cb, String s) Format the passed String as UTF into the passed byte array.
WriteBuffer	getBuffer() Get the WriteBuffer object that this BufferOutput is writeing to.
protected char[]	getCharBuf() Obtain a temp buffer used to avoid allocations from String.toCharArray() and repeated calls to String.charAt(int).
int	getOffset() Determine the current offset of this BufferOutput within the underlying WriteBuffer.
void	setOffset(int of) Specify the offset of the next byte to write to the underlying WriteBuffer.
void	write(byte[] ab) Writes all the bytes in the array ab.
void	write(byte[] ab, int of, int cb) Writes cb bytes starting at offset of from the array ab.
void	write(int b) Writes the eight low-order bits of the argument b.
void	writeBoolean(boolean f) Writes the boolean value f.
void	writeBuffer(ReadBuffer buf) Write all the bytes from the passed ReadBuffer object.
void	writeBuffer(ReadBuffer buf, int of, int cb) Write cb bytes from the passed ReadBuffer object starting at offset of within the passed ReadBuffer.
void	writeByte(int b) Writes the eight low-order bits of the argument b.
void	writeBytes(String s) Writes the String s, but only the low-order byte from each character of the String is written.
void	writeChar(int ch) Writes a char value, comprised of the 16 low-order bits of the argument ch; the 16 high-order bits of ch are ignored.
void	writeChars(String s) Writes the String s as a sequence of characters.
void	writeDouble(double dfl) Writes a double value.
void	writeFloat(float fl) Writes a float value.
void	writeInt(int n) Writes an int value.
void	writeLong(long l) Writes a long value.
void	writePackedInt(int n) Write an int value using a variable-length storage-format.
void	writePackedLong(long l) Write a long value using a variable-length storage-format.
void	writeSafeUTF(String s) Write a variable-length encoded UTF packed String.
void	writeShort(int n) Writes a short value, comprised of the 16 low-order bits of the argument n; the 16 high-order bits of n are ignored.
void	writeStream(InputStreaming stream) Write the remaining contents of the specified InputStreaming object.
void	writeStream(InputStreaming stream, int cb) Write the specified number of bytes of the specified InputStreaming object.
void	writeUTF(String s) Writes the String s as a sequence of characters, but using UTF-8 encoding for the characters, and including the String length data so that the corresponding DataInput.readUTF() method can reconstitute a String from the written data.

Field Detail

m_ofWrite

protected int m_ofWrite

Current write offset within the containing WriteBuffer.

Constructor Detail

AbstractWriteBuffer.AbstractBufferOutput

public AbstractWriteBuffer.AbstractBufferOutput()

Construct an AbstractBufferOutput that will begin writing at the start of the containing WriteBuffer.

AbstractWriteBuffer.AbstractBufferOutput

public AbstractWriteBuffer.AbstractBufferOutput(int of)

Construct an AbstractBufferOutput that will begin writing at the specified offset within the containing WriteBuffer.

Parameters:

of - the offset at which to begin writing

Method Detail

write

public void write(int b)
           throws IOException

Writes the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Specified by:

write in interface OutputStreaming

Specified by:

write in interface DataOutput

Parameters:

b - the byte to write (passed as an integer)

Throws:

IOException - if an I/O error occurs

write

public void write(byte[] ab)
           throws IOException

Writes all the bytes in the array ab.

Specified by:

write in interface OutputStreaming

Specified by:

write in interface DataOutput

Parameters:

ab - the byte array to write

Throws:

IOException - if an I/O error occurs

NullPointerException - if ab is null

write

public void write(byte[] ab,
                  int of,
                  int cb)
           throws IOException

Writes cb bytes starting at offset of from the array ab.

Specified by:

write in interface OutputStreaming

Specified by:

write in interface DataOutput

Parameters:

ab - the byte array to write from

of - the offset into ab to start writing from

cb - the number of bytes from ab to write

Throws:

IOException - if an I/O error occurs

NullPointerException - if ab is null

IndexOutOfBoundsException - if of is negative, or cb is negative, or of+cb is greater than ab.length

flush

public void flush()
           throws IOException

Flushes this OutputStream and forces any buffered output bytes to be written.

Specified by:

flush in interface OutputStreaming

Throws:

IOException - if an I/O error occurs

close

public void close()
           throws IOException

Close the OutputStream and release any system resources associated with it.

BufferOutput implementations do not pass this call down onto an underlying stream, if any.

Specified by:

close in interface OutputStreaming

Specified by:

close in interface WriteBuffer.BufferOutput

Throws:

IOException - if an I/O error occurs

writeBoolean

public void writeBoolean(boolean f)
                  throws IOException

Writes the boolean value f.

Specified by:

writeBoolean in interface DataOutput

Parameters:

f - the boolean to be written

Throws:

IOException - if an I/O error occurs

writeByte

public void writeByte(int b)
               throws IOException

Writes the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Specified by:

writeByte in interface DataOutput

Parameters:

b - the byte to write (passed as an integer)

Throws:

IOException - if an I/O error occurs

writeShort

public void writeShort(int n)
                throws IOException

Writes a short value, comprised of the 16 low-order bits of the argument n; the 16 high-order bits of n are ignored.

Specified by:

writeShort in interface DataOutput

Parameters:

n - the short to write (passed as an integer)

Throws:

IOException - if an I/O error occurs

writeChar

public void writeChar(int ch)
               throws IOException

Writes a char value, comprised of the 16 low-order bits of the argument ch; the 16 high-order bits of ch are ignored.

Specified by:

writeChar in interface DataOutput

Parameters:

ch - the char to write (passed as an integer)

Throws:

IOException - if an I/O error occurs

writeInt

public void writeInt(int n)
              throws IOException

Writes an int value.

Specified by:

writeInt in interface DataOutput

Parameters:

n - the int to write

Throws:

IOException - if an I/O error occurs

writeLong

public void writeLong(long l)
               throws IOException

Writes a long value.

Specified by:

writeLong in interface DataOutput

Parameters:

l - the long to write

Throws:

IOException - if an I/O error occurs

writeFloat

public void writeFloat(float fl)
                throws IOException

Writes a float value.

Specified by:

writeFloat in interface DataOutput

Parameters:

fl - the float to write

Throws:

IOException - if an I/O error occurs

writeDouble

public void writeDouble(double dfl)
                 throws IOException

Writes a double value.

Specified by:

writeDouble in interface DataOutput

Parameters:

dfl - the double to write

Throws:

IOException - if an I/O error occurs

writeBytes

public void writeBytes(String s)
                throws IOException

Writes the String s, but only the low-order byte from each character of the String is written.

Specified by:

writeBytes in interface DataOutput

Parameters:

s - the String to write

Throws:

IOException - if an I/O error occurs

NullPointerException - if s is null

writeChars

public void writeChars(String s)
                throws IOException

Writes the String s as a sequence of characters.

Specified by:

writeChars in interface DataOutput

Parameters:

s - the String to write

Throws:

IOException - if an I/O error occurs

NullPointerException - if s is null

writeUTF

public void writeUTF(String s)
              throws IOException

Writes the String s as a sequence of characters, but using UTF-8 encoding for the characters, and including the String length data so that the corresponding DataInput.readUTF() method can reconstitute a String from the written data.

Specified by:

writeUTF in interface DataOutput

Parameters:

s - the String to write

Throws:

IOException - if an I/O error occurs

NullPointerException - if s is null

getBuffer

public WriteBuffer getBuffer()

Get the WriteBuffer object that this BufferOutput is writeing to.

Specified by:

getBuffer in interface WriteBuffer.BufferOutput

Returns:

the underlying WriteBuffer object

writeSafeUTF

public void writeSafeUTF(String s)
                  throws IOException

Write a variable-length encoded UTF packed String. The major differences between this implementation and DataOutput is that this implementation supports null values and is not limited to 64KB UTF-encoded values.

The binary format for a Safe UTF value is a "packed int" for the binary length followed by the UTF-encoded byte stream. The length is either -1 (indicating a null String) or in the range 0 .. Integer.MAX_VALUE (inclusive). The UTF-encoded portion uses a format idential to DataOutput.

Specified by:

writeSafeUTF in interface WriteBuffer.BufferOutput

Parameters:

s - a String value to write; may be null

Throws:

IOException - if an I/O error occurs

writePackedInt

public void writePackedInt(int n)
                    throws IOException

Write an int value using a variable-length storage-format.

The format differs from DataOutput in that DataOutput always uses a fixed-length 4-byte Big Endian binary format for int values. The "packed" format includes a sign bit (0x40) and a continuation bit (0x80) in the first byte, followed by the least 6 significant bits of the int value. Subsequent bytes (each appearing only if the previous byte had its continuation bit set) include a continuation bit (0x80) and the next least 7 significant bits of the int value. In this way, a 32-bit value is encoded into 1-5 bytes, depending on the magnitude of the int being encoded.

Specified by:

writePackedInt in interface WriteBuffer.BufferOutput

Parameters:

n - an int value to write

Throws:

IOException - if an I/O error occurs

writePackedLong

public void writePackedLong(long l)
                     throws IOException

Write a long value using a variable-length storage-format.

The format differs from DataOutput in that DataOutput always uses a fixed-length 8-byte Big Endian binary format for long values. The "packed" format includes a sign bit (0x40) and a continuation bit (0x80) in the first byte, followed by the least 6 significant bits of the long value. Subsequent bytes (each appearing only if the previous byte had its continuation bit set) include a continuation bit (0x80) and the next least 7 significant bits of the long value. In this way, a 64-bit value is encoded into 1-10 bytes, depending on the magnitude of the int being encoded.

Specified by:

writePackedLong in interface WriteBuffer.BufferOutput

Parameters:

l - a long value to write

Throws:

IOException - if an I/O error occurs

writeBuffer

public void writeBuffer(ReadBuffer buf)
                 throws IOException

Write all the bytes from the passed ReadBuffer object.

This is functionally equivalent to the following code:

 getBuffer().write(getOffset(), buf);
 

Specified by:

writeBuffer in interface WriteBuffer.BufferOutput

Parameters:

buf - a ReadBuffer object

Throws:

IOException - if an I/O error occurs

writeBuffer

public void writeBuffer(ReadBuffer buf,
                        int of,
                        int cb)
                 throws IOException

Write cb bytes from the passed ReadBuffer object starting at offset of within the passed ReadBuffer.

This is functionally equivalent to the following code:

 getBuffer().write(getOffset(), buf, of, cb);
 

Specified by:

writeBuffer in interface WriteBuffer.BufferOutput

Parameters:

buf - a ReadBuffer object

of - the offset within the ReadBuffer of the first byte to write to this BufferOutput

cb - the number of bytes to write

Throws:

IOException - if an I/O error occurs

writeStream

public void writeStream(InputStreaming stream)
                 throws IOException

Write the remaining contents of the specified InputStreaming object.

This is functionally equivalent to the following code:

 getBuffer().write(getOffset(), stream);
 

Specified by:

writeStream in interface WriteBuffer.BufferOutput

Parameters:

stream - the stream of bytes to write to this BufferOutput

Throws:

IOException - if an I/O error occurs, specifically if an IOException occurs reading from the passed stream

writeStream

public void writeStream(InputStreaming stream,
                        int cb)
                 throws IOException

Write the specified number of bytes of the specified InputStreaming object.

This is functionally equivalent to the following code:

 getBuffer().write(getOffset(), stream, cb);
 

Specified by:

writeStream in interface WriteBuffer.BufferOutput

Parameters:

stream - the stream of bytes to write to this BufferOutput

cb - the exact number of bytes to read from the stream and write to this BufferOutput

Throws:

EOFException - if the stream is exhausted before the number of bytes indicated could be read

IOException - if an I/O error occurs, specifically if an IOException occurs reading from the passed stream

getOffset

public int getOffset()

Determine the current offset of this BufferOutput within the underlying WriteBuffer.

Specified by:

getOffset in interface WriteBuffer.BufferOutput

Returns:

the offset of the next byte to write to the WriteBuffer

setOffset

public void setOffset(int of)

Specify the offset of the next byte to write to the underlying WriteBuffer.

Specified by:

setOffset in interface WriteBuffer.BufferOutput

Parameters:

of - the offset of the next byte to write to the WriteBuffer

Throws:

IndexOutOfBoundsException - if of < 0 or of > getBuffer().getMaximumCapacity()

getCharBuf

protected final char[] getCharBuf()

Obtain a temp buffer used to avoid allocations from String.toCharArray() and repeated calls to String.charAt(int).

Returns:

a char buffer of CHAR_BUF_SIZE characters long

calcUTF

protected final int calcUTF(String s)

Figure out how many bytes it will take to hold the passed String.

This method is tightly bound to formatUTF.

Parameters:

s - the String

Returns:

the binary UTF length

formatUTF

protected final void formatUTF(byte[] ab,
                               int ofb,
                               int cb,
                               String s)

Format the passed String as UTF into the passed byte array.

This method is tightly bound to calcUTF.

Parameters:

ab - the byte array to format into

ofb - the offset into the byte array to write the first byte

cb - the number of bytes that the UTF will take

s - the String