org.apache.crimson.util
Class XmlChars

java.lang.Object
  org.apache.crimson.util.XmlChars

public class XmlChars

extends Object

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.

Author:

David Brownell

Constructor Summary

private

XmlChars()

Method Summary

static boolean	isChar(int ucs4char) Returns true if the argument, a UCS-4 character code, is valid in XML documents.
private static boolean	isCompatibilityChar(char c)
private static boolean	isDigit(char c)
private static boolean	isExtender(char c)
static boolean	isLetter(char c) Returns true if the character is an XML "letter".
private static boolean	isLetter2(char c)
static boolean	isNameChar(char c) Returns true if the character is allowed to be a non-initial character in names according to the XML recommendation.
static boolean	isNCNameChar(char c) Returns true if the character is allowed to be a non-initial character in unscoped names according to the rules of the XML Namespaces proposed recommendation.
static boolean	isSpace(char c) Returns true if the character is allowed where XML supports whitespace characters, false otherwise.

Methods inherited from class java.lang.Object

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

Constructor Detail

XmlChars

private XmlChars()

Method Detail

isChar

public static boolean isChar(int ucs4char)

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 surrogate characters can be combined to encode UCS-4 characters in documents containing only Unicode. (The char datatype in the Java Programming Language represents Unicode characters, including unpaired surrogates.)

In XML, UCS-4 characters can also be encoded by the use of character references such as �, 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.

Parameters:

ucs4char - The 32-bit UCS-4 character being tested.

isNameChar

public static boolean isNameChar(char c)

Returns true if the character is allowed to be a non-initial character in names according to the XML recommendation.

See Also:

isNCNameChar(char), isLetter(char)

isNCNameChar

public static boolean isNCNameChar(char c)

Returns true if the character is allowed to be a non-initial character in unscoped names according to the rules of the XML Namespaces proposed recommendation. Except for precluding the colon (used to separate names from their scopes) these characters are just as allowed by the XML recommendation.

See Also:

isNameChar(char), isLetter(char)

isSpace

public static boolean isSpace(char c)

Returns true if the character is allowed where XML supports whitespace characters, false otherwise.

isLetter

public static boolean isLetter(char c)

Returns true if the character is an XML "letter". XML Names must start with Letters or a few other characters, but other characters in names must only satisfy the isNameChar predicate.

See Also:

isNameChar(char), isNCNameChar(char)

isCompatibilityChar

private static boolean isCompatibilityChar(char c)

isLetter2

private static boolean isLetter2(char c)

isDigit

private static boolean isDigit(char c)

isExtender

private static boolean isExtender(char c)