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package com.sun.xml.internal.dtdparser;
This class contains static methods used to determine whether identifiers
may appear in certain roles in XML documents. Such methods are used
both to parse and to create such documents.
Author: David Brownell Version: 1.1, 00/08/05
/**
* This class contains static methods used to determine whether identifiers
* may appear in certain roles in XML documents. Such methods are used
* both to parse and to create such documents.
*
* @author David Brownell
* @version 1.1, 00/08/05
*/
public class XmlNames {
private XmlNames() {
}
Returns true if the value is a legal XML name.
Params: - value – the string being tested
/**
* Returns true if the value is a legal XML name.
*
* @param value the string being tested
*/
public static boolean isName(String value) {
if (value == null)
return false;
char c = value.charAt(0);
if (!XmlChars.isLetter(c) && c != '_' && c != ':')
return false;
for (int i = 1; i < value.length(); i++)
if (!XmlChars.isNameChar(value.charAt(i)))
return false;
return true;
}
Returns true if the value is a legal "unqualified" XML name, as
defined in the XML Namespaces proposed recommendation.
These are normal XML names, except that they may not contain
a "colon" character.
Params: - value – the string being tested
/**
* Returns true if the value is a legal "unqualified" XML name, as
* defined in the XML Namespaces proposed recommendation.
* These are normal XML names, except that they may not contain
* a "colon" character.
*
* @param value the string being tested
*/
public static boolean isUnqualifiedName(String value) {
if (value == null || value.length() == 0)
return false;
char c = value.charAt(0);
if (!XmlChars.isLetter(c) && c != '_')
return false;
for (int i = 1; i < value.length(); i++)
if (!XmlChars.isNCNameChar(value.charAt(i)))
return false;
return true;
}
Returns true if the value is a legal "qualified" XML name, as defined
in the XML Namespaces proposed recommendation. Qualified names are
composed of an optional prefix (an unqualified name), followed by a
colon, and a required "local part" (an unqualified name). Prefixes are
declared, and correspond to particular URIs which scope the "local
part" of the name. (This method cannot check whether the prefix of a
name has been declared.)
Params: - value – the string being tested
/**
* Returns true if the value is a legal "qualified" XML name, as defined
* in the XML Namespaces proposed recommendation. Qualified names are
* composed of an optional prefix (an unqualified name), followed by a
* colon, and a required "local part" (an unqualified name). Prefixes are
* declared, and correspond to particular URIs which scope the "local
* part" of the name. (This method cannot check whether the prefix of a
* name has been declared.)
*
* @param value the string being tested
*/
public static boolean isQualifiedName(String value) {
if (value == null)
return false;
// [6] QName ::= (Prefix ':')? LocalPart
// [7] Prefix ::= NCName
// [8] LocalPart ::= NCName
int first = value.indexOf(':');
// no Prefix, only check LocalPart
if (first <= 0)
return isUnqualifiedName(value);
// Prefix exists, check everything
int last = value.lastIndexOf(':');
if (last != first)
return false;
return isUnqualifiedName(value.substring(0, first))
&& isUnqualifiedName(value.substring(first + 1));
}
This method returns true if the identifier is a "name token"
as defined in the XML specification. Like names, these
may only contain "name characters"; however, they do not need
to have letters as their initial characters. Attribute values
defined to be of type NMTOKEN(S) must satisfy this predicate.
Params: - token – the string being tested
/**
* This method returns true if the identifier is a "name token"
* as defined in the XML specification. Like names, these
* may only contain "name characters"; however, they do not need
* to have letters as their initial characters. Attribute values
* defined to be of type NMTOKEN(S) must satisfy this predicate.
*
* @param token the string being tested
*/
public static boolean isNmtoken(String token) {
int length = token.length();
for (int i = 0; i < length; i++)
if (!XmlChars.isNameChar(token.charAt(i)))
return false;
return true;
}
This method returns true if the identifier is a "name token" as
defined by the XML Namespaces proposed recommendation.
These are like XML "name tokens" but they may not contain the
"colon" character.
Params: - token – the string being tested
See Also:
/**
* This method returns true if the identifier is a "name token" as
* defined by the XML Namespaces proposed recommendation.
* These are like XML "name tokens" but they may not contain the
* "colon" character.
*
* @param token the string being tested
* @see #isNmtoken
*/
public static boolean isNCNmtoken(String token) {
return isNmtoken(token) && token.indexOf(':') < 0;
}
}