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oracle.i18n.lcsd
Class LCSDetectionReader

java.lang.Object
java.io.Reader
oracle.i18n.lcsd.LCSDetectionReader

All Implemented Interfaces:

Closeable, Readable

Direct Known Subclasses:

LCSDetectionHTMLReader

public class LCSDetectionReader

extends Reader

The LCSDetectionReader class is the language and character detector (LCSD) reader class that transparently detects the character set and converts it to the Unicode data.

The most common usage is for the Reader interface to read the text data as follows:

 InputStream in = file.getInputStream();
 Reader rdr = new LCSDetectionReader(in);
 char cbuf = new char[1024];
 for (int len = -1; (len = rdr.read(cbuf)) != -1;)
 {
   // do something with cbuf
   ...
 }
 

The detection occurs only once by sampling the first chunk of data.

Since:

10.2

Field Summary

protected static int

DEFAULT_SAMPLING_SIZE Default sampling byte length for language and character set detection.

Fields inherited from class java.io.Reader

lock

Constructor Summary

LCSDetectionReader(InputStream in)
Constructs the LCSD Reader instance with the character set determined by sampling initial data.

LCSDetectionReader(InputStream in, int size)
Constructs the LCSD Reader instance with the character set determined by sampling initial data.

LCSDetectionReader(Reader reader)
Constructs the LCSD Reader instance over the input stream reader.

LCSDetectionReader(String profile, InputStream in)
Constructs the LCSD Reader instance with the character set determined by sampling initial data.

LCSDetectionReader(String profile, InputStream in, int size)
Constructs the LCSD Reader instance with the character set determined by sampling initial data.

LCSDetectionReader(String profile, Reader reader)
Constructs the LCSD Reader instance over the reader.

Method Summary

void	close() Closes the stream.
LCSDResultSet	getResult() Returns the result set of LCSD.
void	mark(int readAheadLimit) Marks the present position in the stream.
boolean	markSupported() Tells whether this stream supports the mark() operation.
int	read() Reads a single character.
int	read(char[] cbuf) Reads characters into an array.
int	read(char[] cbuf, int offset, int length) Reads characters into a portion of an array.
boolean	ready() Tells whether this stream is ready to be read.
void	reset() Resets the stream.

Methods inherited from class java.io.Reader

read, skip

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SAMPLING_SIZE

protected static final int DEFAULT_SAMPLING_SIZE

Default sampling byte length for language and character set detection.

See Also:

Constant Field Values

Constructor Detail

LCSDetectionReader

public LCSDetectionReader(InputStream in)
                   throws IOException,
                          UTFDataFormatException

Constructs the LCSD Reader instance with the character set determined by sampling initial data.

Parameters:

in - the InputStream object including the text data

Throws:

IOException - if any I/O error occurs

UTFDataFormatException - if an invalid UTF-8 data sequence is detected. Note this occurs only if the source is UTF-8 data.

LCSDetectionReader

public LCSDetectionReader(InputStream in,
                          int size)
                   throws IOException,
                          UTFDataFormatException

Constructs the LCSD Reader instance with the character set determined by sampling initial data.

Parameters:

in - the InputStream object including the text data

size - the sampling size

Throws:

IOException - if any I/O error occurs

UTFDataFormatException - if an invalid UTF-8 data sequence is detected. Note this occurs only if the source is in UTF-8 encoding

LCSDetectionReader

public LCSDetectionReader(String profile,
                          InputStream in)
                   throws IOException,
                          UTFDataFormatException

Constructs the LCSD Reader instance with the character set determined by sampling initial data.

Parameters:

profile - the LCSD profile name. null is the default.

in - the InputStream object including the text data

Throws:

IOException - if any I/O error occurs

UTFDataFormatException - if an invalid UTF-8 data sequence is detected. Note this occurs only if the source is in UTF-8 encoding

LCSDetectionReader

public LCSDetectionReader(String profile,
                          InputStream in,
                          int size)
                   throws IOException,
                          UTFDataFormatException

Constructs the LCSD Reader instance with the character set determined by sampling initial data.

Parameters:

profile - the LCSD profile name. null is the default

in - the InputStream object including the text data

size - the sampling size

Throws:

IOException - if any I/O error occurs

UTFDataFormatException - if an invalid UTF-8 data sequence is detected. Note this occurs only if the source is in UTF-8 encoding

LCSDetectionReader

public LCSDetectionReader(Reader reader)
                   throws IOException

Constructs the LCSD Reader instance over the input stream reader.

This constructor is used to detect the language from the reader object. The character set is always UTF-16.

Parameters:

reader - the InputStreamReader object

Throws:

IOException - if any I/O error occurs

LCSDetectionReader

public LCSDetectionReader(String profile,
                          Reader reader)
                   throws IOException

Constructs the LCSD Reader instance over the reader.

This constructor is used to detect the language from the reader object. The character set is always UTF-16.

Parameters:

profile - the LCSD Profile name. null is the default

reader - the reader including the text data

Throws:

IOException - if any I/O error occurs

Method Detail

getResult

public LCSDResultSet getResult()
                        throws IOException,
                               UTFDataFormatException

Returns the result set of LCSD.

If the language information is required in your application, call this method. The character set is implicitly used for the conversions, but if you need the name, call this method.

Returns:

the result set of LCSD

Throws:

IOException - if any I/O error occurs

UTFDataFormatException - if an invalid UTF-8 data sequence is detected. Note this occurs only if the source is in UTF-8 encoding

read

public int read()
         throws IOException,
                UTFDataFormatException

Reads a single character.

Overrides:

read in class Reader

Returns:

the character read, or -1 if the end of the stream has been reached

Throws:

IOException - if an I/O error occurs

UTFDataFormatException - if any invalid UTF-8 data sequence is detected. Note this occurs only if the source is UTF-8 data.

read

public int read(char[] cbuf,
                int offset,
                int length)
         throws IOException,
                UTFDataFormatException

Reads characters into a portion of an array.

Specified by:

read in class Reader

Parameters:

cbuf - destination buffer

offset - offset at which to start storing characters

length - maximum number of characters to read

Returns:

the number of characters read, or -1 if the end of the stream has been reached

Throws:

IOException - if I/O error occurs

UTFDataFormatException - if any invalid UTF-8 data sequence is detected. Note this occurs only if the source is UTF-8 data.

close

public void close()
           throws IOException

Closes the stream.

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException - if I/O error occurs

ready

public boolean ready()
              throws IOException

Tells whether this stream is ready to be read.

Overrides:

ready in class Reader

Returns:

true if the next read() call is guaranteed not to block input, otherwise false is returned

Throws:

IOException - if I/O error occurs

markSupported

public boolean markSupported()

Tells whether this stream supports the mark() operation.

Overrides:

markSupported in class Reader

Returns:

true if this stream supports the mark() operation

mark

public void mark(int readAheadLimit)
          throws IOException

Marks the present position in the stream.

Overrides:

mark in class Reader

Parameters:

readAheadLimit - limit on the number of characters that may be read while still preserving the mark. After reading the limited number of characters, attempting to reset the stream may fail.

Throws:

IOException - if the stream does not support the mark() operation, or if some other I/O error occurs

reset

public void reset()
           throws IOException

Resets the stream.

Overrides:

reset in class Reader

Throws:

IOException - if the stream has not been marked, or if the mark has been invalidated, or if the stream does not support the reset() operation, or if some other I/O error occurs

read

public int read(char[] cbuf)
         throws IOException,
                UTFDataFormatException

Reads characters into an array.

Overrides:

read in class Reader

Parameters:

cbuf - destination buffer

Returns:

the number of characters read, or -1 if the end of the stream has been reached

Throws:

IOException - if I/O error occurs

UTFDataFormatException - if any invalid UTF-8 data sequence is detected. Note this occurs only if the source is UTF-8 data.

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