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com.tangosol.io
Class MultiBufferReadBuffer.MultiBufferInput

java.lang.Object
java.io.InputStream
com.tangosol.io.AbstractReadBuffer.AbstractBufferInput
com.tangosol.io.MultiBufferReadBuffer.MultiBufferInput

All Implemented Interfaces:

InputStreaming, ReadBuffer.BufferInput, Closeable, DataInput

Enclosing class:

MultiBufferReadBuffer

public final class MultiBufferReadBuffer.MultiBufferInput

extends AbstractReadBuffer.AbstractBufferInput

An implementation of the BufferInput interface that is backed by a series of the underlying ReadBuffer BufferInput objects.

Field Summary

protected boolean

m_fDestructive True if the BufferInput set to self-destruct.

Constructor Summary

MultiBufferReadBuffer.MultiBufferInput()
Default constructor.

MultiBufferReadBuffer.MultiBufferInput(boolean fDestructive)
Default constructor.

Method Summary

protected ReadBuffer.BufferInput	getIn() Obtain the underlying BufferOutput.
int	read() 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.
int	read(byte[] ab, int of, int cb) 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.
ReadBuffer	readBuffer(int cb) Read cb bytes and return them as a ReadBuffer object.
byte	readByte() Read a byte value. This method is the counterpart for the DataOutput.writeByte(int) method.
char	readChar() Read a char value. This method is the counterpart for the DataOutput.writeChar(int) method.
double	readDouble() Read a double value. This method is the counterpart for the DataOutput.writeDouble(double) method.
float	readFloat() Read a float value. This method is the counterpart for the DataOutput.writeFloat(float) method.
int	readInt() Read an int value. This method is the counterpart for the DataOutput.writeInt(int) method.
long	readLong() Read a long value. This method is the counterpart for the DataOutput.writeLong(long) method.
int	readPackedInt() Read an int value using a variable-length storage format as described by WriteBuffer.BufferOutput.writePackedInt(int).
long	readPackedLong() Read a long value using a variable-length storage format as described by WriteBuffer.BufferOutput.writePackedLong(long).
String	readSafeUTF() Read a variable-length encoded UTF packed String. The major differences between this implementation and DataInput is that this supports null String values and is not limited to 64KB UTF-encoded values.
short	readShort() Read a short value. This method is the counterpart for the DataOutput.writeShort(int) method.
int	readUnsignedShort() 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.
String	readUTF() Reads a String value. This method is the counterpart for the DataOutput.writeUTF(java.lang.String) method.
void	reset() 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.
void	setOffset(int of) Specify the offset of the next byte to read from the underlying ReadBuffer.
int	skipBytes(int cb) 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.
protected void	sync() After traversing an underlying WriteBuffer boundary, or otherwise changing the offset significantly, sync between this BufferOutput's absolute position and an underlying BufferOutput's relative position.

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

adjustOffsetInternal, available, close, convertUTF, getBuffer, getCharBuf, getMarkInternal, getOffset, mark, markSupported, read, readBoolean, readFully, readFully, readLine, readUnsignedByte, readUTF, setMarkInternal, setOffsetInternal, skip

Field Detail

m_fDestructive

protected boolean m_fDestructive

True if the BufferInput set to self-destruct.

Constructor Detail

MultiBufferReadBuffer.MultiBufferInput

public MultiBufferReadBuffer.MultiBufferInput()

Default constructor.

MultiBufferReadBuffer.MultiBufferInput

public MultiBufferReadBuffer.MultiBufferInput(boolean fDestructive)

Default constructor.

Parameters:

fDestructive - true iff the stream should self-destruct as it is advanced

Method Detail

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 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[] ab,
                int of,
                int cb)
         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 InputStreaming

Overrides:

read in class AbstractReadBuffer.AbstractBufferInput

Parameters:

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

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

cb - 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

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 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

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

readUTF

public String readUTF()
               throws IOException

Reads a String value.

This method is the counterpart for the DataOutput.writeUTF(java.lang.String) method.

Specified by:

readUTF in interface ReadBuffer.BufferInput

Specified by:

readUTF in interface DataInput

Overrides:

readUTF in class AbstractReadBuffer.AbstractBufferInput

Returns:

a String value

Throws:

UTFDataFormatException - if the bytes that were read were not a valid UTF-8 encoded string

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

IOException - if an I/O error occurs

readSafeUTF

public String readSafeUTF()
                   throws IOException

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

Specified by:

readSafeUTF in interface ReadBuffer.BufferInput

Overrides:

readSafeUTF in class AbstractReadBuffer.AbstractBufferInput

Returns:

a String value; may be null

Throws:

IOException - if an I/O error occurs

readPackedInt

public int readPackedInt()
                  throws IOException

Read an int value using a variable-length storage format as described by WriteBuffer.BufferOutput.writePackedInt(int).

Specified by:

readPackedInt in interface ReadBuffer.BufferInput

Overrides:

readPackedInt in class AbstractReadBuffer.AbstractBufferInput

Returns:

an int value

Throws:

IOException - if an I/O error occurs

readPackedLong

public long readPackedLong()
                    throws IOException

Read a long value using a variable-length storage format as described by WriteBuffer.BufferOutput.writePackedLong(long).

Specified by:

readPackedLong in interface ReadBuffer.BufferInput

Overrides:

readPackedLong in class AbstractReadBuffer.AbstractBufferInput

Returns:

a long value

Throws:

IOException - if an I/O error occurs

readBuffer

public ReadBuffer readBuffer(int cb)
                      throws IOException

Read cb bytes and return them as a ReadBuffer object.

Specified by:

readBuffer in interface ReadBuffer.BufferInput

Overrides:

readBuffer in class AbstractReadBuffer.AbstractBufferInput

Parameters:

cb - the number of bytes to read

Returns:

a ReadBuffer object composed of cb bytes read from the BufferInput

Throws:

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

IOException - if an I/O error occurs

setOffset

public void setOffset(int of)

Specify the offset of the next byte to read from the underlying ReadBuffer.

Specified by:

setOffset in interface ReadBuffer.BufferInput

Overrides:

setOffset in class AbstractReadBuffer.AbstractBufferInput

Parameters:

of - the offset of the next byte to read from the ReadBuffer

getIn

protected ReadBuffer.BufferInput getIn()

Obtain the underlying BufferOutput.

Returns:

the underlying BufferOutput

sync

protected void sync()

After traversing an underlying WriteBuffer boundary, or otherwise changing the offset significantly, sync between this BufferOutput's absolute position and an underlying BufferOutput's relative position.

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