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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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java.lang.Objectcom.tangosol.io.AbstractWriteBuffer
com.tangosol.io.ByteArrayWriteBuffer
public class ByteArrayWriteBuffer
ByteArrayWriteBuffer is an implementation of WriteBuffer on a byte array. It is designed to support both fixed length buffers and resizable buffers.
This implementation is not intended to be thread safe.
Nested Class Summary | |
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class |
ByteArrayWriteBuffer.ByteArrayBufferOutput
ByteArrayBufferOutput is an implementation of BufferOutput optimized for writing to the buffer's underlying byte array. |
Nested classes/interfaces inherited from class com.tangosol.io.AbstractWriteBuffer |
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AbstractWriteBuffer.AbstractBufferOutput |
Nested classes/interfaces inherited from interface com.tangosol.io.WriteBuffer |
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WriteBuffer.BufferOutput |
Field Summary | |
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protected byte[] |
m_ab
The byte array that holds the binary data. |
protected ByteArrayReadBuffer |
m_bufUnsafe
Cached ReadBuffer to quickly provide an answer to getUnsafeReadBuffer() . |
protected int |
m_cb
Number of bytes in the byte array that have been written by this WriteBuffer. |
protected int |
m_cbMax
Number of bytes that the byte array can be grown to. |
Fields inherited from class com.tangosol.io.AbstractWriteBuffer |
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CHAR_BUF_MASK, CHAR_BUF_SIZE, m_achBuf, NO_BINARY, NO_BYTES |
Constructor Summary | |
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protected |
ByteArrayWriteBuffer()
Default constructor; intended only for use by subclasses. |
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ByteArrayWriteBuffer(byte[] ab)
Construct a ByteArrayWriteBuffer on a byte array. |
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ByteArrayWriteBuffer(int cbCap)
Construct an ByteArrayWriteBuffer with a certain initial capacity. |
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ByteArrayWriteBuffer(int cbCap,
int cbMax)
Construct an ByteArrayWriteBuffer with a certain initial capacity and a certain maximum capacity. |
Method Summary | |
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protected void |
checkBounds(int of,
int cb)
Validate the ranges for the passed bounds and make sure that the underlying array is big enough to handle them. |
protected int |
copyStream(int ofDest,
InputStreaming stream,
int cbLimit)
Store the remaining contents of the specified InputStreaming object at the specified offset within this buffer. |
WriteBuffer.BufferOutput |
getBufferOutput(int of)
Get a BufferOutput object to write data to this buffer starting at a particular offset. |
int |
getCapacity()
Determine the number of bytes that the buffer can hold without resizing itself. |
int |
getMaximumCapacity()
Determine the maximum number of bytes that the buffer can hold. |
byte[] |
getRawByteArray()
Obtain the byte array that this ReadBuffer uses. |
ReadBuffer |
getUnsafeReadBuffer()
Get a ReadBuffer object to read data from this buffer. |
protected void |
grow(int cbCap)
Grow the underlying byte array to at least the specified size. |
boolean |
isByteArrayPrivate()
Determine if the underlying byte[] should be treated as private data. |
int |
length()
Determine the length of the data that is in the buffer. |
void |
makeByteArrayPrivate()
Make sure that the underlying byte[] will be treated as private data. |
void |
retain(int of,
int cb)
Starting with the byte at offset of, retain cb bytes in this WriteBuffer, such that the byte at offset of is shifted to offset 0, the byte at offset of + 1 is shifted to offset 1, and so on up to the byte at offset of + cb - 1, which is shifted to offset cb - 1. |
protected void |
updateLength(int cb)
Update the length if the passed length is greater than the current buffer length. |
void |
write(int ofDest,
byte b)
Store the specified byte at the specified offset within the buffer. |
void |
write(int ofDest,
byte[] abSrc,
int ofSrc,
int cbSrc)
Store the specified number of bytes from the specified location within the passed byte array at the specified offset within this buffer. |
void |
write(int ofDest,
InputStreaming stream,
int cbSrc)
Store the specified number of bytes from the specified InputStreaming object at the specified offset within this buffer. |
void |
write(int ofDest,
ReadBuffer bufSrc,
int ofSrc,
int cbSrc)
Store the specified portion of the contents of the specified ReadBuffer at the specified offset within this buffer. |
Methods inherited from class com.tangosol.io.AbstractWriteBuffer |
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clear, clone, getAppendingBufferOutput, getBufferOutput, getReadBuffer, getWriteBuffer, getWriteBuffer, retain, tmpbuf, tmpbuf, toBinary, toByteArray, write, write, write |
Field Detail |
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protected byte[] m_ab
protected int m_cb
protected int m_cbMax
protected transient ByteArrayReadBuffer m_bufUnsafe
getUnsafeReadBuffer()
.
Constructor Detail |
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protected ByteArrayWriteBuffer()
Note that this default constructor leaves the buffer in an invalid state.
public ByteArrayWriteBuffer(byte[] ab)
ab
- a byte array
NullPointerException
- if ab is nullpublic ByteArrayWriteBuffer(int cbCap)
cbCap
- initial capacity
IllegalArgumentException
- if cbCap is negativepublic ByteArrayWriteBuffer(int cbCap, int cbMax)
cbCap
- initial capacitycbMax
- maximum capacity
IllegalArgumentException
- if cbCap or cbMax
is negative, or if cbCap is greater than
cbMaxMethod Detail |
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public void write(int ofDest, byte b)
For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code:
byte[] abSrc = new byte[1];
abSrc[0] = b;
write(ofDest, abSrc, 0, abSrc.length);
write
in interface WriteBuffer
write
in class AbstractWriteBuffer
ofDest
- the offset within this buffer to store the passed datab
- the byte to store in this bufferpublic void write(int ofDest, byte[] abSrc, int ofSrc, int cbSrc)
As a result of this method, the buffer length as reported by the
length()
method will become
Math.max(length()
, ofDest + cbSrc).
As a result of this method, the buffer capacity as reported by the
getCapacity()
method will not change if the new value
returned by length()
would not exceed the old value
returned by getCapacity()
; otherwise, the capacity
will be increased such that
getCapacity()
>= length()
. Regardless, it is
always true that getCapacity()
>= length()
and getMaximumCapacity()
>= getCapacity()
.
If the buffer capacity cannot be increased due to resource constraints,
an undesignated Error or RuntimeException will be thrown, such as
OutOfMemoryError.
write
in interface WriteBuffer
write
in class AbstractWriteBuffer
ofDest
- the offset within this buffer to store the passed dataabSrc
- the array containing the bytes to store in this bufferofSrc
- the offset within the passed byte array to copy fromcbSrc
- the number of bytes to copy from the passed byte array
NullPointerException
- if abSrc
is
null
IndexOutOfBoundsException
- if ofDest,
ofSrc or cbSrc is negative, if
ofSrc + cbSrc is greater than
abSrc.length, or if ofDest + cbSrc is
greater than getMaximumCapacity()
public void write(int ofDest, ReadBuffer bufSrc, int ofSrc, int cbSrc)
For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code:
byte[] abSrc = bufSrc.toByteArray(ofSrc, cbSrc);
write(ofDest, abSrc, 0, abSrc.length);
write
in interface WriteBuffer
write
in class AbstractWriteBuffer
ofDest
- the offset within this buffer to store the passed databufSrc
- the array of bytes to store in this bufferofSrc
- the offset within the passed ReadBuffer to copy fromcbSrc
- the number of bytes to copy from the passed ReadBufferpublic void write(int ofDest, InputStreaming stream, int cbSrc) throws IOException
For purposes of side-effects and potential exceptions, this method is functionally similar to the following code:
DataInputStream streamData = new DataInputStream(
new WrapperInputStream(stream));
byte[] abSrc = new byte[cbSrc];
streamData.readFully(abSrc);
write(ofDest, abSrc, 0, abSrc.length);
write
in interface WriteBuffer
write
in class AbstractWriteBuffer
ofDest
- the offset within this buffer to store the passed datastream
- the stream of bytes to read and store in this buffercbSrc
- the exact number of bytes to read from the stream and
put in this buffer
IOException
- if an IOException occurs reading from the
passed streampublic int length()
length
in interface WriteBuffer
length
in class AbstractWriteBuffer
public void retain(int of, int cb)
length()
method will
be equal to cb.
Legal values for the offset of the first byte to retain of are
(of >= 0 && of <= length()
). Legal values for the
number of bytes to retain cb are
(cb >= 0 && cb <= length()
), such that
(of + cb <= length()
).
If cb is zero, then this method will have the same effect as clear. If of is zero, then this method will have the effect of truncating the data in the buffer, but no bytes will be shifted within the buffer.
The effect on the capacity of the buffer is implementation-specific; some implementations are expected to retain the same capacity while others are expected to shrink accordingly.
retain
in interface WriteBuffer
retain
in class AbstractWriteBuffer
of
- the offset of the first byte within the WriteBuffer that
will be retainedcb
- the number of bytes to retain
IndexOutOfBoundsException
- if of or cb is
negative of if of + cb is greater than
length()
public int getCapacity()
length()
bytes that can be written to it without
overflowing the current underlying buffer allocation. Since the buffer
is an abstract concept, the actual mechanism for the underlying buffer
is not known, but it could be a Java NIO buffer, or a byte array, etc.
Note that if the maximum size returned by getMaximumCapacity()
is greater than the current size returned by this method, then the
WriteBuffer will automatically resize itself to allocate more space
when the amount of data written to it passes the current size.
getCapacity
in interface WriteBuffer
getCapacity
in class AbstractWriteBuffer
public int getMaximumCapacity()
getMaximumCapacity
in interface WriteBuffer
getMaximumCapacity
in class AbstractWriteBuffer
public WriteBuffer.BufferOutput getBufferOutput(int of)
Note that each call to this method will return a new BufferOutput object, with the possible exception being that a zero-length non-resizing WriteBuffer could always return the same instance (since it is not writable).
This is functionally equivalent to:
BufferOutput bufout = getBufferOutput();
bufout.setOffset(of);
return bufout;
getBufferOutput
in interface WriteBuffer
getBufferOutput
in class AbstractWriteBuffer
of
- the offset of the first byte of this buffer that the
BufferOutput will write to
IndexOutOfBoundsException
- if of is negative, or
of is larger than the
getMaximumCapacity()
of this
WriteBuffer objectpublic ReadBuffer getUnsafeReadBuffer()
To get a snapshot, use the AbstractWriteBuffer.getReadBuffer()
method.
getUnsafeReadBuffer
in interface WriteBuffer
getUnsafeReadBuffer
in class AbstractWriteBuffer
public boolean isByteArrayPrivate()
public void makeByteArrayPrivate()
public byte[] getRawByteArray()
AbstractWriteBuffer.toByteArray()
.
protected int copyStream(int ofDest, InputStreaming stream, int cbLimit) throws IOException
copyStream
in class AbstractWriteBuffer
ofDest
- the offset within this buffer to store the passed datastream
- the stream of bytes to read and store in this buffercbLimit
- the maximum number of bytes to copy
IOException
- if an IOException occurs reading from the
passed stream or if the limit is reached without emptying
the source streamprotected void checkBounds(int of, int cb)
of
- the offset that data is about to be written tocb
- the length of the data that is about to be writtenprotected void grow(int cbCap)
cbCap
- the required or requested capacityprotected void updateLength(int cb)
cb
- the count of the last byte written (or the index of the
next byte to write)
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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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