com.tangosol.io.nio

Class ByteBufferReadBuffer.ByteBufferInput

java.lang.Object

java.io.InputStream

com.tangosol.io.AbstractReadBuffer.AbstractBufferInput

com.tangosol.io.nio.ByteBufferReadBuffer.ByteBufferInput

All Implemented Interfaces:

com.oracle.coherence.common.io.InputStreaming, ReadBuffer.BufferInput, Closeable, DataInput, AutoCloseable

Enclosing class:

ByteBufferReadBuffer

public final class ByteBufferReadBuffer.ByteBufferInput
extends AbstractReadBuffer.AbstractBufferInput
implements ReadBuffer.BufferInput

This is a simple implementation of the BufferInput interface on top of a ByteBuffer.

Author:

cp 2006.04.06

Field Summary

Fields

Modifier and Type	Field and Description
protected ByteBuffer	m_buf The ByteBuffer object from which data is read.

Constructor Summary

Constructors

Constructor and Description
ByteBufferInput(ByteBuffer buf) Default constructor.

Method Summary

Modifier and Type	Method and Description
protected void	adjustOffsetInternal(int cb) Adjust the internal stream offset.
int	available() Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur.
protected String	convertUTF(int of, int cb) Convert a UTF-8 encoded section of the binary stream into a String.
ByteBuffer	getByteBuffer() Obtain the NIO ByteBuffer that this BufferInput is based on.
int	getOffset() Determine the current offset of this BufferInput within the underlying ReadBuffer.
void	mark(int cbReadLimit) Marks the current read position in the InputStream in order to support the stream to be later "rewound" (using the InputStreaming.reset() method) to the current position.
int	read() Read the next byte of data from the InputStream.
int	read(byte[] abDest, int ofDest, int cbDest) Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of.
byte	readByte() Read a byte value.
char	readChar() Read a char value.
double	readDouble() Read a double value.
float	readFloat() Read a float value.
int	readInt() Read an int value.
long	readLong() Read a long value.
short	readShort() Read a short value.
int	readUnsignedShort() Read an unsigned short value.
void	reset() Rewind this stream to the position at the time the InputStreaming.mark(int) method was last called on this InputStream.
void	setOffsetInternal(int of) Update the internal stream offset.
int	skipBytes(int cb) Skips over up to the specified number of bytes of data.

Methods inherited from class com.tangosol.io.AbstractReadBuffer.AbstractBufferInput

close, getBuffer, getCharBuf, getMarkInternal, markSupported, read, readBoolean, readBuffer, readFully, readFully, readLine, readPackedInt, readPackedLong, readSafeUTF, readUnsignedByte, readUTF, readUTF, setMarkInternal, setOffset, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.tangosol.io.ReadBuffer.BufferInput

close, getBuffer, markSupported, readBoolean, readBuffer, readFully, readFully, readLine, readPackedInt, readPackedLong, readSafeUTF, readUnsignedByte, readUTF, setOffset

Methods inherited from interface com.oracle.coherence.common.io.InputStreaming

read, skip

Field Detail

m_buf

protected ByteBuffer m_buf

The ByteBuffer object from which data is read.

Constructor Detail

ByteBufferInput

public ByteBufferInput(ByteBuffer buf)

Default constructor.

Parameters:

buf - the NIO ByteBuffer that this BufferInput is backed by

Method Detail

getByteBuffer

public ByteBuffer getByteBuffer()

Obtain the NIO ByteBuffer that this BufferInput is based on.

Returns:

the underlying ByteBuffer

read

public int read()
         throws IOException

Read the next byte of data from the InputStream. The value byte is returned as an int in the range 0 to 255. If the end of the stream has been reached, the value -1 is returned.

This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Specified by:

read in interface com.oracle.coherence.common.io.InputStreaming

Overrides:

read in class AbstractReadBuffer.AbstractBufferInput

Returns:

the next byte of data, or -1 if the end of the stream has been reached

Throws:

IOException - if an I/O error occurs

read

public int read(byte[] abDest,
                int ofDest,
                int cbDest)
         throws IOException

Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of. The number of bytes actually read is returned.

This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Specified by:

read in interface com.oracle.coherence.common.io.InputStreaming

Overrides:

read in class AbstractReadBuffer.AbstractBufferInput

Parameters:

abDest - the array to store the bytes which are read from the stream

ofDest - the offset into the array that the read bytes will be stored

cbDest - the maximum number of bytes to read

Returns:

the number of bytes read from the stream, or -1 if no bytes were read from the stream because the end of the stream had been reached

Throws:

IOException - if an I/O error occurs

mark

public void mark(int cbReadLimit)

Marks the current read position in the InputStream in order to support the stream to be later "rewound" (using the InputStreaming.reset() method) to the current position. The caller passes in the maximum number of bytes that it expects to read before calling the InputStreaming.reset() method, thus indicating the upper bounds of the responsibility of the stream to be able to buffer what it has read in order to support this functionality.

BufferInput implementations ignore the cbReadLimit; they must support an unlimited read limit, since they appear to the user as an input stream on top of a fully realized read buffer.

Specified by:

mark in interface com.oracle.coherence.common.io.InputStreaming

Specified by:

mark in interface ReadBuffer.BufferInput

Overrides:

mark in class AbstractReadBuffer.AbstractBufferInput

Parameters:

cbReadLimit - the maximum number of bytes that caller expects the InputStream to be able to read before the mark position becomes invalid

reset

public void reset()
           throws IOException

Rewind this stream to the position at the time the InputStreaming.mark(int) method was last called on this InputStream. If the InputStream cannot fulfill this contract, it should throw an IOException.

Specified by:

reset in interface com.oracle.coherence.common.io.InputStreaming

Overrides:

reset in class AbstractReadBuffer.AbstractBufferInput

Throws:

IOException - if an I/O error occurs, for example if this has not been marked or if the mark has been invalidated

available

public int available()
              throws IOException

Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur. This method reflects the assumed implementation of various buffering InputStreams, which can guarantee non-blocking reads up to the extent of their buffers, but beyond that the read operations will have to read from some underlying (and potentially blocking) source.

BufferInput implementations must implement this method to return the extent of the buffer that has not yet been read; in other words, the entire un-read portion of the buffer must be available.

Specified by:

available in interface com.oracle.coherence.common.io.InputStreaming

Specified by:

available in interface ReadBuffer.BufferInput

Overrides:

available in class AbstractReadBuffer.AbstractBufferInput

Returns:

the number of bytes that can be read from this InputStream without blocking

Throws:

IOException - if an I/O error occurs

skipBytes

public int skipBytes(int cb)
              throws IOException

Skips over up to the specified number of bytes of data. The number of bytes actually skipped over may be fewer than the number specified to skip, and may even be zero; this can be caused by an end-of-file condition, but can also occur even when there is data remaining to be read. As a result, the caller should check the return value from this method, which indicates the actual number of bytes skipped.

Specified by:

skipBytes in interface ReadBuffer.BufferInput

Specified by:

skipBytes in interface DataInput

Overrides:

skipBytes in class AbstractReadBuffer.AbstractBufferInput

Parameters:

cb - the maximum number of bytes to skip over

Returns:

the actual number of bytes that were skipped over

Throws:

IOException - if an I/O error occurs

readByte

public byte readByte()
              throws IOException

Read a byte value.

This method is the counterpart for the DataOutput.writeByte(int) method.

Specified by:

readByte in interface ReadBuffer.BufferInput

Specified by:

readByte in interface DataInput

Overrides:

readByte in class AbstractReadBuffer.AbstractBufferInput

Returns:

a byte value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readShort

public short readShort()
                throws IOException

Read a short value.

This method is the counterpart for the DataOutput.writeShort(int) method.

Specified by:

readShort in interface ReadBuffer.BufferInput

Specified by:

readShort in interface DataInput

Overrides:

readShort in class AbstractReadBuffer.AbstractBufferInput

Returns:

a short value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readUnsignedShort

public int readUnsignedShort()
                      throws IOException

Read an unsigned short value.

This method is the counterpart for the DataOutput.writeShort(int) method when it is used with unsigned 16-bit values.

Specified by:

readUnsignedShort in interface ReadBuffer.BufferInput

Specified by:

readUnsignedShort in interface DataInput

Overrides:

readUnsignedShort in class AbstractReadBuffer.AbstractBufferInput

Returns:

an int value in the range of 0x0000 to 0xFFFF

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readChar

public char readChar()
              throws IOException

Read a char value.

This method is the counterpart for the DataOutput.writeChar(int) method.

Specified by:

readChar in interface ReadBuffer.BufferInput

Specified by:

readChar in interface DataInput

Overrides:

readChar in class AbstractReadBuffer.AbstractBufferInput

Returns:

a char value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readInt

public int readInt()
            throws IOException

Read an int value.

This method is the counterpart for the DataOutput.writeInt(int) method.

Specified by:

readInt in interface ReadBuffer.BufferInput

Specified by:

readInt in interface DataInput

Overrides:

readInt in class AbstractReadBuffer.AbstractBufferInput

Returns:

an int value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readLong

public long readLong()
              throws IOException

Read a long value.

This method is the counterpart for the DataOutput.writeLong(long) method.

Specified by:

readLong in interface ReadBuffer.BufferInput

Specified by:

readLong in interface DataInput

Overrides:

readLong in class AbstractReadBuffer.AbstractBufferInput

Returns:

a long value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readFloat

public float readFloat()
                throws IOException

Read a float value.

This method is the counterpart for the DataOutput.writeFloat(float) method.

Specified by:

readFloat in interface ReadBuffer.BufferInput

Specified by:

readFloat in interface DataInput

Overrides:

readFloat in class AbstractReadBuffer.AbstractBufferInput

Returns:

a float value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

readDouble

public double readDouble()
                  throws IOException

Read a double value.

This method is the counterpart for the DataOutput.writeDouble(double) method.

Specified by:

readDouble in interface ReadBuffer.BufferInput

Specified by:

readDouble in interface DataInput

Overrides:

readDouble in class AbstractReadBuffer.AbstractBufferInput

Returns:

a double value

Throws:

EOFException - if the value could not be read because no more data remains to be read

IOException - if an I/O error occurs

getOffset

public int getOffset()

Determine the current offset of this BufferInput within the underlying ReadBuffer.

Specified by:

getOffset in interface ReadBuffer.BufferInput

Overrides:

getOffset in class AbstractReadBuffer.AbstractBufferInput

Returns:

the offset of the next byte to read from the ReadBuffer

setOffsetInternal

public void setOffsetInternal(int of)

Update the internal stream offset.

Overrides:

setOffsetInternal in class AbstractReadBuffer.AbstractBufferInput

Parameters:

of - the new offset

adjustOffsetInternal

protected void adjustOffsetInternal(int cb)

Adjust the internal stream offset.

Overrides:

adjustOffsetInternal in class AbstractReadBuffer.AbstractBufferInput

Parameters:

cb - the number of bytes that were written

convertUTF

protected String convertUTF(int of,
                            int cb)
                     throws IOException

Convert a UTF-8 encoded section of the binary stream into a String.

Overrides:

convertUTF in class AbstractReadBuffer.AbstractBufferInput

Parameters:

of - the offset within the stream

cb - the length in bytes within the stream

Returns:

the String value

Throws:

IOException - if an I/O or conversion exception occurs, such as UTFDataFormatException