com.prosyst.util.io
Class CharacterConvertor

java.lang.Object
  com.prosyst.util.io.CharacterConvertor

Direct Known Subclasses:

CharacterConvertor_ISO8859_1, CharacterConvertor_UTF8

public abstract class CharacterConvertor
extends java.lang.Object

Constructor Summary

CharacterConvertor()

Method Summary

abstract void	convert(byte[] input, int off1, int len1, char[] output, int off2, int len2, int[] result) Converts the input bytes, using the specified encoding into unicode chars.
abstract void	convert(char[] input, int off1, int len1, byte[] output, int off2, int len2, int[] result) Converts the input chars, using the specified encoding into bytes in the given range.
static CharacterConvertor	get(java.lang.String encoding) Gets a CharacterConvertor for a specific encoding.
abstract java.lang.String	getCharacterEncoding() Gets the identifier String of the encoding.
static java.lang.String	getDefaultEncoding()
abstract int	getMaxBytesPerChar() Gets the maximum bytes that may be used for the conversion of a single char, using this CharacterConvertor's encoding.

Methods inherited from class java.lang.Object

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

Constructor Detail

CharacterConvertor

public CharacterConvertor()

Method Detail

get

public static CharacterConvertor get(java.lang.String encoding)

Gets a CharacterConvertor for a specific encoding. Supported encodings are ISO8859_1 && UTF8. Once instantiated convertors are cached, to be reused.

Parameters:

encoding - string identifier of the target encoding. may be ISO8859_1 or UTF8

Returns:

a proper CharacterConvertor or null if encoding is not supported.

getDefaultEncoding

public static java.lang.String getDefaultEncoding()

convert

public abstract void convert(char[] input,
                             int off1,
                             int len1,
                             byte[] output,
                             int off2,
                             int len2,
                             int[] result)
                      throws java.io.IOException

Converts the input chars, using the specified encoding into bytes in the given range. Conversion ends if there's no more input or if the output gets full.

Parameters:

input - characters to be converted

off1 - offset position in the input arrat of the first character to be converted

len1 - count of characters to be converted

output - where output bytes are put

off2 - offset of the first output byte

len2 - count of bytes that may be used for output conversion

result - a non-null two element int[], which holds the result lengths from the conversion: result[0] contains the number of chars converted and result[1] - the number of bytes that are result of the conversion

Throws:

java.io.IOException - if there's some error during conversion

convert

public abstract void convert(byte[] input,
                             int off1,
                             int len1,
                             char[] output,
                             int off2,
                             int len2,
                             int[] result)
                      throws java.io.IOException

Converts the input bytes, using the specified encoding into unicode chars. Conversion ends if there's no more input or if the output gets full.

Parameters:

input - bytes to be converted

off1 - offset position in the input arrat of the first byte to be converted

len1 - count of bytes to be converted

output - where output chars are put

off2 - offset of the first output char

len2 - count of chars that may be used for output conversion

result - a non-null two element int[], which holds the result lengths from the conversion: result[0] contains the number of bytes converted and result[1] - the number of chars that are result of the conversion

Throws:

java.io.IOException - if there's some error during conversion

getCharacterEncoding

public abstract java.lang.String getCharacterEncoding()

Gets the identifier String of the encoding. This may be not the same string, which has been used for obtaining the CharacterConverter.

Returns:

key string for the encoding

getMaxBytesPerChar

public abstract int getMaxBytesPerChar()

Gets the maximum bytes that may be used for the conversion of a single char, using this CharacterConvertor's encoding.

Returns:

maximum number of bytes, necessary to convert a char.