Returns true if the argument, a UCS-4 character code, is valid in XML documents.
/*
* $Id: XmlChars.java,v 1.1 2004/08/19 05:30:22 aslom Exp $
*
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/**
* Methods in this class are used to determine whether characters may
* appear in certain roles in XML documents. Such methods are used
* both to parse and to create such documents.
*
* @version 1.8
* @author David Brownell
*/
public class XmlChars
{
// can't construct instances
private XmlChars () { }
/**
* Returns true if the argument, a UCS-4 character code, is valid in
* XML documents. Unicode characters fit into the low sixteen
* bits of a UCS-4 character, and pairs of Unicode <em>surrogate
* characters</em> can be combined to encode UCS-4 characters in
* documents containing only Unicode. (The <code>char</code> datatype
* in the Java Programming Language represents Unicode characters,
* including unpaired surrogates.)
*
* <P> In XML, UCS-4 characters can also be encoded by the use of
* <em>character references</em> such as <b>&#x12345678;</b>, which
* happens to refer to a character that is disallowed in XML documents.
* UCS-4 characters allowed in XML documents can be expressed with
* one or two Unicode characters.
*
* @param ucs4char The 32-bit UCS-4 character being tested.
*/
static public boolean isChar (int ucs4char)
{
// [2] Char ::= #x0009 | #x000A | #x000D
// | [#x0020-#xD7FF]
// ... surrogates excluded!
// | [#xE000-#xFFFD]
// | [#x10000-#x10ffff]
return ((ucs4char >= 0x0020 && ucs4char <= 0xD7FF)
|| ucs4char == 0x000A || ucs4char == 0x0009
|| ucs4char == 0x000D
|| (ucs4char >= 0xE000 && ucs4char <= 0xFFFD)
|| (ucs4char >= 0x10000 && ucs4char <= 0x10ffff));
}
}