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com.tangosol.io
Interface ReadBuffer.BufferInput

All Superinterfaces:

DataInput, InputStreaming

All Known Implementing Classes:

AbstractByteArrayReadBuffer.ByteArrayBufferInput, AbstractReadBuffer.AbstractBufferInput, ByteBufferReadBuffer.ByteBufferInput, MultiBufferReadBuffer.MultiBufferInput, WrapperBufferInput

Enclosing interface:

ReadBuffer

public static interface ReadBuffer.BufferInput

extends InputStreaming, DataInput

The BufferInput interface represents a DataInputStream on top of a ReadBuffer.

Author:

cp 2005.01.18

Method Summary

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.
void	close() Close the InputStream and release any system resources associated with it.
ReadBuffer	getBuffer() Get the ReadBuffer object that this BufferInput is reading from.
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.
boolean	markSupported() Determine if this InputStream supports the mark(int) and InputStreaming.reset() methods.
boolean	readBoolean() Read a boolean value.
ReadBuffer	readBuffer(int cb) Read cb bytes and return them as a ReadBuffer object.
byte	readByte() Read a byte value.
char	readChar() Read a char value.
double	readDouble() Read a double value.
float	readFloat() Read a float value.
void	readFully(byte[] ab) Read ab.length bytes and store them in ab.
void	readFully(byte[] ab, int of, int cb) Read cb bytes and store them in ab starting at offset of.
int	readInt() Read an int value.
String	readLine() Reads the next "line" of text.
long	readLong() Read a long value.
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.
short	readShort() Read a short value.
int	readUnsignedByte() Read an unsigned byte value.
int	readUnsignedShort() Read an unsigned short value.
String	readUTF() Reads a String value.
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.

Methods inherited from interface com.tangosol.io.InputStreaming

read, read, read, reset, skip

Method Detail

available

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 InputStreaming

Returns:

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

Throws:

IOException - if an I/O error occurs

close

void close()
           throws IOException

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

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

Specified by:

close in interface InputStreaming

Throws:

IOException - if an I/O error occurs

mark

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 InputStreaming

Parameters:

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

markSupported

boolean markSupported()

Determine if this InputStream supports the mark(int) and InputStreaming.reset() methods.

BufferInput implementations must support the mark(int) and InputStreaming.reset() methods, so this method always returns true.

Specified by:

markSupported in interface InputStreaming

Returns:

true if this InputStream supports the mark and reset method; false otherwise

readFully

void readFully(byte[] ab)
               throws IOException

Read ab.length bytes and store them in ab.

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

Specified by:

readFully in interface DataInput

Parameters:

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

Throws:

NullPointerException - if the passed array is null

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

IOException - if an I/O error occurs

readFully

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

Read cb bytes and store them in ab starting at offset of.

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

Specified by:

readFully in interface DataInput

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

Throws:

NullPointerException - if the passed array is null

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

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

IOException - if an I/O error occurs

skipBytes

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 DataInput

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

readBoolean

boolean readBoolean()
                    throws IOException

Read a boolean value.

This method is the counterpart for the DataOutput.writeBoolean(boolean) method.

Specified by:

readBoolean in interface DataInput

Returns:

either true or false

Throws:

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

IOException - if an I/O error occurs

readByte

byte readByte()
              throws IOException

Read a byte value.

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

Specified by:

readByte in interface DataInput

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

readUnsignedByte

int readUnsignedByte()
                     throws IOException

Read an unsigned byte value.

This method is the counterpart for the DataOutput.writeByte(int) method when it is used with unsigned 8-bit values.

Specified by:

readUnsignedByte in interface DataInput

Returns:

an int value in the range 0x00 to 0xFF

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

short readShort()
                throws IOException

Read a short value.

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

Specified by:

readShort in interface DataInput

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

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 DataInput

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

char readChar()
              throws IOException

Read a char value.

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

Specified by:

readChar in interface DataInput

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

int readInt()
            throws IOException

Read an int value.

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

Specified by:

readInt in interface DataInput

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

long readLong()
              throws IOException

Read a long value.

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

Specified by:

readLong in interface DataInput

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

float readFloat()
                throws IOException

Read a float value.

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

Specified by:

readFloat in interface DataInput

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

double readDouble()
                  throws IOException

Read a double value.

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

Specified by:

readDouble in interface DataInput

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

readLine

String readLine()
                throws IOException

Reads the next "line" of text.

This method does not have a counterpart in the DataOutput interface. Furthermore, this method is defined as operating on bytes and not on characters, and thus it should be selected for use only after careful consideration, as if it were deprecated (which it has been in java.io.DataInputStream).

Specified by:

readLine in interface DataInput

Returns:

a line of text as a String

Throws:

IOException - if an I/O error occurs.

readUTF

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 DataInput

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

getBuffer

ReadBuffer getBuffer()

Get the ReadBuffer object that this BufferInput is reading from.

Returns:

the underlying ReadBuffer object

readSafeUTF

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.

Returns:

a String value; may be null

Throws:

IOException - if an I/O error occurs

readPackedInt

int readPackedInt()
                  throws IOException

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

Returns:

an int value

Throws:

IOException - if an I/O error occurs

readPackedLong

long readPackedLong()
                    throws IOException

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

Returns:

a long value

Throws:

IOException - if an I/O error occurs

readBuffer

ReadBuffer readBuffer(int cb)
                      throws IOException

Read cb bytes and return them as a ReadBuffer object.

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

getOffset

int getOffset()

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

Returns:

the offset of the next byte to read from the ReadBuffer

setOffset

void setOffset(int of)

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

Parameters:

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

Throws:

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

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