net.sf.saxon.om
Class NameChecker

java.lang.Object
  net.sf.saxon.om.NameChecker

Direct Known Subclasses:

Name10Checker, Name11Checker

public abstract class NameChecker
extends Object

A NameChecker performs validation and analysis of XML names. There are two implementations of this interface, one for XML 1.0 names and one for XML 1.1 names. The class also handles validation of characters against the XML 1.0 or XML 1.1 rules.

Constructor Summary

NameChecker()

Method Summary

String[]	checkQNameParts(CharSequence qname) Validate a QName, and return the prefix and local name.
static String	getPrefix(String qname) Extract the prefix from a QName.
String[]	getQNameParts(CharSequence qname) Validate a QName, and return the prefix and local name.
abstract String	getXMLVersion() Return the XML version supported by this NameChecker
abstract boolean	isNCNameChar(int ch) Test whether a character can appear in an NCName
abstract boolean	isNCNameStartChar(int ch) Test whether a character can appear at the start of an NCName
boolean	isQName(String name) Validate whether a given string constitutes a valid QName, as defined in XML Namespaces.
abstract boolean	isValidChar(int ch) Test whether a character is a valid XML character
boolean	isValidNCName(CharSequence ncName) Validate whether a given string constitutes a valid NCName, as defined in XML Namespaces.
boolean	isValidNmtoken(CharSequence nmtoken) Check to see if a string is a valid Nmtoken according to [7] in the XML 1.0 Recommendation

Methods inherited from class java.lang.Object

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

Constructor Detail

NameChecker

public NameChecker()

Method Detail

isQName

public final boolean isQName(String name)

Validate whether a given string constitutes a valid QName, as defined in XML Namespaces. Note that this does not test whether the prefix is actually declared.

Parameters:

name - the name to be tested

Returns:

true if the name is a lexically-valid QName

getPrefix

public static String getPrefix(String qname)

Extract the prefix from a QName. Note, the QName is assumed to be valid.

Parameters:

qname - The lexical QName whose prefix is required

Returns:

the prefix, that is the part before the colon. Returns an empty string if there is no prefix

getQNameParts

public final String[] getQNameParts(CharSequence qname)
                             throws QNameException

Validate a QName, and return the prefix and local name. The local name is checked to ensure it is a valid NCName. The prefix is not checked, on the theory that the caller will look up the prefix to find a URI, and if the prefix is invalid, then no URI will be found.

Parameters:

qname - the lexical QName whose parts are required. Note that leading and trailing whitespace is not permitted

Returns:

an array of two strings, the prefix and the local name. The first item is a zero-length string if there is no prefix.

Throws:

QNameException - if not a valid QName.

checkQNameParts

public final String[] checkQNameParts(CharSequence qname)
                               throws XPathException

Validate a QName, and return the prefix and local name. Both parts are checked to ensure they are valid NCNames.

Used from compiled code

Parameters:

qname - the lexical QName whose parts are required. Note that leading and trailing whitespace is not permitted

Returns:

an array of two strings, the prefix and the local name. The first item is a zero-length string if there is no prefix.

Throws:

XPathException - if not a valid QName.

isValidNCName

public final boolean isValidNCName(CharSequence ncName)

Validate whether a given string constitutes a valid NCName, as defined in XML Namespaces.

Parameters:

ncName - the name to be tested

Returns:

true if the name is a lexically-valid QName

isValidNmtoken

public final boolean isValidNmtoken(CharSequence nmtoken)

Check to see if a string is a valid Nmtoken according to [7] in the XML 1.0 Recommendation

Parameters:

nmtoken - string to check

Returns:

true if nmtoken is a valid Nmtoken

isValidChar

public abstract boolean isValidChar(int ch)

Test whether a character is a valid XML character

Parameters:

ch - the character to be tested

Returns:

true if this is a valid character in the selected version of XML

isNCNameChar

public abstract boolean isNCNameChar(int ch)

Test whether a character can appear in an NCName

Parameters:

ch - the character to be tested

Returns:

true if this is a valid character in an NCName the selected version of XML

isNCNameStartChar

public abstract boolean isNCNameStartChar(int ch)

Test whether a character can appear at the start of an NCName

Parameters:

ch - the character to be tested

Returns:

true if this is a valid character at the start of an NCName the selected version of XML

getXMLVersion

public abstract String getXMLVersion()

Return the XML version supported by this NameChecker

Returns:

"1.0" or "1.1" as a string