public interface

SymbolTable

sun.text.normalizer.SymbolTable

This interface is deprecated.
This is a draft API and might change in a future release of ICU.

Class Overview

An interface that defines both lookup protocol and parsing of symbolic names.

A symbol table maintains two kinds of mappings. The first is between symbolic names and their values. For example, if the variable with the name "start" is set to the value "alpha" (perhaps, though not necessarily, through an expression such as "$start=alpha"), then the call lookup("start") will return the char[] array ['a', 'l', 'p', 'h', 'a'].

The second kind of mapping is between character values and UnicodeMatcher objects. This is used by RuleBasedTransliterator, which uses characters in the private use area to represent objects such as UnicodeSets. If U+E015 is mapped to the UnicodeSet [a-z], then lookupMatcher(0xE015) will return the UnicodeSet [a-z].

Finally, a symbol table defines parsing behavior for symbolic names. All symbolic names start with the SYMBOL_REF character. When a parser encounters this character, it calls parseReference() with the position immediately following the SYMBOL_REF. The symbol table parses the name, if there is one, and returns it.

Summary

Constants
char SYMBOL_REF This constant is deprecated. This is a draft API and might change in a future release of ICU.
Public Methods
abstract char[] lookup(String s)
This method is deprecated. This is a draft API and might change in a future release of ICU.
abstract UnicodeMatcher lookupMatcher(int ch)
This method is deprecated. This is a draft API and might change in a future release of ICU.
abstract String parseReference(String text, ParsePosition pos, int limit)
This method is deprecated. This is a draft API and might change in a future release of ICU.

Constants

public static final char SYMBOL_REF

This constant is deprecated.
This is a draft API and might change in a future release of ICU.

The character preceding a symbol reference name.

Constant Value: 36 (0x00000024)

Public Methods

public abstract char[] lookup (String s)

This method is deprecated.
This is a draft API and might change in a future release of ICU.

Lookup the characters associated with this string and return it. Return null if no such name exists. The resultant array may have length zero.

Parameters
s the symbolic name to lookup
Returns
  • a char array containing the name's value, or null if there is no mapping for s.

public abstract UnicodeMatcher lookupMatcher (int ch)

This method is deprecated.
This is a draft API and might change in a future release of ICU.

Lookup the UnicodeMatcher associated with the given character, and return it. Return null if not found.

Parameters
ch a 32-bit code point from 0 to 0x10FFFF inclusive.
Returns
  • the UnicodeMatcher object represented by the given character, or null if there is no mapping for ch.

public abstract String parseReference (String text, ParsePosition pos, int limit)

This method is deprecated.
This is a draft API and might change in a future release of ICU.

Parse a symbol reference name from the given string, starting at the given position. If no valid symbol reference name is found, return null and leave pos unchanged. That is, if the character at pos cannot start a name, or if pos is at or after text.length(), then return null. This indicates an isolated SYMBOL_REF character.

Parameters
text the text to parse for the name
pos on entry, the index of the first character to parse. This is the character following the SYMBOL_REF character. On exit, the index after the last parsed character. If the parse failed, pos is unchanged on exit.
limit the index after the last character to be parsed.
Returns
  • the parsed name, or null if there is no valid symbolic name at the given position.