org.ka2ddo.yaac.io

Class NonshareableDataInputStreamForSockets

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.ka2ddo.yaac.io.NonshareableDataInputStreamForSockets

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable

public final class NonshareableDataInputStreamForSockets
extends java.io.FilterInputStream
implements java.io.DataInput

This class is a duplicate of java.io.DataInputStream, without the byte counter and the synchronization, so it can only be used by a single thread, plus it avoids using the read() method of the passed-in InputStream, because SocketInputStream has the heap-thrashing habit of malloc-ing a 1-byte array for each such read and then throwing the array away.

Author:

Andrew Pavlin, KA2DDO

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
NonshareableDataInputStreamForSockets(java.io.InputStream in) Creates a NonshareableDataInputStream that uses the specified underlying InputStream.

Method Summary

Modifier and Type	Method and Description
int	read() Reads the next byte of data from this input stream.
int	read(byte[] b) Reads some number of bytes from the contained input stream and stores them into the buffer array b.
int	read(byte[] b, int off, int len) Reads up to len bytes of data from the contained input stream into an array of bytes.
boolean	readBoolean() See the general contract of the readBoolean method of DataInput.
byte	readByte() See the general contract of the readByte method of DataInput.
char	readChar() See the general contract of the readChar method of DataInput.
double	readDouble() See the general contract of the readDouble method of DataInput.
float	readFloat() See the general contract of the readFloat method of DataInput.
void	readFully(byte[] b) See the general contract of the readFully method of DataInput.
void	readFully(byte[] b, int off, int len) See the general contract of the readFully method of DataInput.
int	readInt() See the general contract of the readInt method of DataInput.
java.lang.String	readLine() See the general contract of the readLine method of DataInput.
long	readLong() See the general contract of the readLong method of DataInput.
short	readShort() See the general contract of the readShort method of DataInput.
int	readUnsignedByte() See the general contract of the readUnsignedByte method of DataInput.
int	readUnsignedShort() See the general contract of the readUnsignedShort method of DataInput.
java.lang.String	readUTF() See the general contract of the readUTF method of DataInput.
java.lang.String	readUTF8Line() This method reads a line of text encoded in UTF-8, terminated by a line ending (CR, LF, or CRLF) or EOF.
int	readUTFChar() This method reads one UTF-8 encoded character from the input stream, using as many bytes as necessary to get an entire character.
int	skipBytes(int n) See the general contract of the skipBytes method of DataInput.

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

NonshareableDataInputStreamForSockets

public NonshareableDataInputStreamForSockets(java.io.InputStream in)

Creates a NonshareableDataInputStream that uses the specified underlying InputStream.

Parameters:

in - the specified input stream

Method Detail

read

public int read()
         throws java.io.IOException

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because 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.

This method simply performs in.read(bytearr, 0, 1) and returns the buffer contents.

Overrides:

read in class java.io.FilterInputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached.

Throws:

java.io.IOException - if an I/O error occurs.

See Also:

FilterInputStream.in

read

public final int read(byte[] b)
               throws java.io.IOException

Reads some number of bytes from the contained input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown.

If b is null, a NullPointerException is thrown. If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is, at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[k-1], leaving elements b[k] through b[b.length-1] unaffected.

The read(b) method has the same effect as:

 read(b, 0, b.length)
 

Overrides:

read in class java.io.FilterInputStream

Parameters:

b - the buffer into which the data is read.

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException - if the first byte cannot be read for any reason other than end of file, the stream has been closed and the underlying input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in, InputStream.read(byte[], int, int)

read

public final int read(byte[] b,
                      int off,
                      int len)
               throws java.io.IOException

Reads up to len bytes of data from the contained input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.

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

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off] and elements b[off+len] through b[b.length-1] are unaffected.

Overrides:

read in class java.io.FilterInputStream

Parameters:

b - the buffer into which the data is read.

off - the start offset in the destination array b

len - the maximum number of bytes read.

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.lang.NullPointerException - If b is null.

java.lang.IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

java.io.IOException - if the first byte cannot be read for any reason other than end of file, the stream has been closed and the underlying input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in, InputStream.read(byte[], int, int)

readFully

public final void readFully(byte[] b)
                     throws java.io.IOException

See the general contract of the readFully method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readFully in interface java.io.DataInput

Parameters:

b - the buffer into which the data is read.

Throws:

java.io.EOFException - if this input stream reaches the end before reading all the bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readFully

public final void readFully(byte[] b,
                            int off,
                            int len)
                     throws java.io.IOException

See the general contract of the readFully method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readFully in interface java.io.DataInput

Parameters:

b - the buffer into which the data is read.

off - the start offset of the data.

len - the number of bytes to read.

Throws:

java.io.EOFException - if this input stream reaches the end before reading all the bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

skipBytes

public final int skipBytes(int n)
                    throws java.io.IOException

See the general contract of the skipBytes method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

skipBytes in interface java.io.DataInput

Parameters:

n - the number of bytes to be skipped.

Returns:

the actual number of bytes skipped.

Throws:

java.io.IOException - if the contained input stream does not support seek, or the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

readBoolean

public final boolean readBoolean()
                          throws java.io.IOException

See the general contract of the readBoolean method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readBoolean in interface java.io.DataInput

Returns:

the boolean value read.

Throws:

java.io.EOFException - if this input stream has reached the end.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readByte

public final byte readByte()
                    throws java.io.IOException

See the general contract of the readByte method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readByte in interface java.io.DataInput

Returns:

the next byte of this input stream as a signed 8-bit byte.

Throws:

java.io.EOFException - if this input stream has reached the end.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readUnsignedByte

public final int readUnsignedByte()
                           throws java.io.IOException

See the general contract of the readUnsignedByte method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readUnsignedByte in interface java.io.DataInput

Returns:

the next byte of this input stream, interpreted as an unsigned 8-bit number.

Throws:

java.io.EOFException - if this input stream has reached the end.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readShort

public final short readShort()
                      throws java.io.IOException

See the general contract of the readShort method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readShort in interface java.io.DataInput

Returns:

the next two bytes of this input stream, interpreted as a signed 16-bit number.

Throws:

java.io.EOFException - if this input stream reaches the end before reading two bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readUnsignedShort

public final int readUnsignedShort()
                            throws java.io.IOException

See the general contract of the readUnsignedShort method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readUnsignedShort in interface java.io.DataInput

Returns:

the next two bytes of this input stream, interpreted as an unsigned 16-bit integer.

Throws:

java.io.EOFException - if this input stream reaches the end before reading two bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readChar

public final char readChar()
                    throws java.io.IOException

See the general contract of the readChar method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readChar in interface java.io.DataInput

Returns:

the next two bytes of this input stream, interpreted as a char.

Throws:

java.io.EOFException - if this input stream reaches the end before reading two bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readInt

public final int readInt()
                  throws java.io.IOException

See the general contract of the readInt method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readInt in interface java.io.DataInput

Returns:

the next four bytes of this input stream, interpreted as an int.

Throws:

java.io.EOFException - if this input stream reaches the end before reading four bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readLong

public final long readLong()
                    throws java.io.IOException

See the general contract of the readLong method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readLong in interface java.io.DataInput

Returns:

the next eight bytes of this input stream, interpreted as a long.

Throws:

java.io.EOFException - if this input stream reaches the end before reading eight bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

FilterInputStream.in

readFloat

public final float readFloat()
                      throws java.io.IOException

See the general contract of the readFloat method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readFloat in interface java.io.DataInput

Returns:

the next four bytes of this input stream, interpreted as a float.

Throws:

java.io.EOFException - if this input stream reaches the end before reading four bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

DataInputStream.readInt(), Float.intBitsToFloat(int)

readDouble

public final double readDouble()
                        throws java.io.IOException

See the general contract of the readDouble method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readDouble in interface java.io.DataInput

Returns:

the next eight bytes of this input stream, interpreted as a double.

Throws:

java.io.EOFException - if this input stream reaches the end before reading eight bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

See Also:

DataInputStream.readLong(), Double.longBitsToDouble(long)

readLine

public final java.lang.String readLine()
                                throws java.io.IOException

See the general contract of the readLine method of DataInput.

Bytes for this operation are read from the contained input stream. Note that this method only supports extended 8-bit ASCII; it does not support UTF-8 or other locale-specific character sets.

Specified by:

readLine in interface java.io.DataInput

Returns:

the next line of text from this input stream.

Throws:

java.io.IOException - if an I/O error occurs.

See Also:

BufferedReader.readLine(), FilterInputStream.in

readUTF

public final java.lang.String readUTF()
                               throws java.io.IOException

See the general contract of the readUTF method of DataInput.

Bytes for this operation are read from the contained input stream.

Specified by:

readUTF in interface java.io.DataInput

Returns:

a Unicode string.

Throws:

java.io.EOFException - if this input stream reaches the end before reading all the bytes.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

java.io.UTFDataFormatException - if the bytes do not represent a valid modified UTF-8 encoding of a string.

See Also:

DataInputStream.readUTF(DataInput)

readUTFChar

public final int readUTFChar()
                      throws java.io.EOFException,
                             java.io.UTFDataFormatException,
                             java.io.IOException

This method reads one UTF-8 encoded character from the input stream, using as many bytes as necessary to get an entire character. Note that this method cannot support Unicode characters represented by the UTF-16 high and low surrogate sequence as decoded from a 4-byte UTF-8 character, as it would require returning 2 Java chars and this method can only return one,

Bytes for this operation are read from the contained input stream.

Returns:

the Unicode character corresponding to the one to four bytes read from the input stream.

Throws:

java.io.EOFException - if this input stream reaches the end before reading an entire UTF-8 character.

java.io.UTFDataFormatException - if the first few bytes in the stream do not represent a valid modified UTF-8 encoding of a Unicode character or the stream ends before the completion of a multi-byte UTF-8 character.

java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.

readUTF8Line

public final java.lang.String readUTF8Line()
                                    throws java.io.IOException

This method reads a line of text encoded in UTF-8, terminated by a line ending (CR, LF, or CRLF) or EOF.

Bytes for this operation are read from the contained input stream. Note that this method only supports UTF-8; it does not support other locale-specific character sets.

Returns:

the next line of text from this input stream.

Throws:

java.io.IOException - if an I/O error occurs.