Package net.sf.saxon.om

Class StructuredQName

  • All Implemented Interfaces:
    IdentityComparable
    public class StructuredQName
extends java.lang.Object
implements IdentityComparable
    This class provides an economical representation of a QName triple (prefix, URI, and localname). The value is stored internally as a character array containing the concatenation of URI, localname, and prefix (in that order) with two integers giving the start positions of the localname and prefix.

    Instances of this class are immutable.

    • Constructor Summary

      Constructors 
      Constructor Description
      StructuredQName​(java.lang.String prefix, java.lang.String uri, java.lang.String localName)
      Construct a StructuredQName from a prefix, URI, and local name.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static int computeHashCode​(java.lang.CharSequence uri, java.lang.CharSequence local)
      Expose the hashCode algorithm so that other implementations of QNames can construct a compatible hashcode
      boolean equals​(java.lang.Object other)
      Compare two StructuredQName values for equality.
      static StructuredQName fromClarkName​(java.lang.String expandedName)
      Make a structuredQName from a Clark name
      static StructuredQName fromEQName​(java.lang.String eqName)
      Make a structured QName from an EQName in Q{uri}local format.
      static StructuredQName fromLexicalQName​(java.lang.String lexicalName, boolean useDefault, boolean allowEQName, NamespaceResolver resolver)
      Make a structured QName from a lexical QName, using a supplied NamespaceResolver to resolve the prefix
      java.lang.String getClarkName()
      Get the expanded QName in Clark format, that is "{uri}local" if it is in a namespace, or just "local" otherwise.
      java.lang.String getDisplayName()
      Get the display name, that is the lexical QName in the form [prefix:]local-part
      java.lang.String getEQName()
      Get the expanded QName as an EQName, that is "Q{uri}local" for a name in a namespace, or "Q{}local" otherwise
      java.lang.String getLocalPart()
      Get the local part of the QName
      NamespaceBinding getNamespaceBinding()
      Get the NamespaceBinding (prefix/uri pair) corresponding to this name
      java.lang.String getPrefix()
      Get the prefix of the QName.
      StructuredQName getStructuredQName()
      Get the name as a StructuredQName (which it already is; but this satisfies the NodeName interface)
      java.lang.String getURI()
      Get the namespace URI of the QName.
      int hashCode()
      Get a hashcode to reflect the equals() method.
      boolean hasURI​(java.lang.String uri)
      Test whether the URI is equal to some constant
      int identityHashCode()
      Get a hashCode that offers the guarantee that if A.isIdentical(B), then A.identityHashCode() == B.identityHashCode()
      boolean isIdentical​(IdentityComparable other)
      Determine whether two IdentityComparable objects are identical.
      javax.xml.namespace.QName toJaxpQName()
      Convert the StructuredQName to a javax.xml.namespace.QName
      java.lang.String toString()
      The toString() method displays the QName as a lexical QName, that is prefix:local

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • StructuredQName

        public StructuredQName​(java.lang.String prefix,
                       java.lang.String uri,
                       java.lang.String localName)
        Construct a StructuredQName from a prefix, URI, and local name. This method performs no validation.
        Parameters:
        prefix - The prefix. Use an empty string to represent the null prefix.
        uri - The namespace URI. Use an empty string or null to represent the no-namespace
        localName - The local part of the name

    • Method Detail

      • fromClarkName

        public static StructuredQName fromClarkName​(java.lang.String expandedName)
        Make a structuredQName from a Clark name
        Parameters:
        expandedName - the name in Clark notation "{uri}local" if in a namespace, or "local" otherwise. The format "{}local" is also accepted for a name in no namespace. The EQName syntax (Q{uri}local) is also accepted.
        Returns:
        the constructed StructuredQName
        Throws:
        java.lang.IllegalArgumentException - if the Clark name is malformed

      • fromLexicalQName

        public static StructuredQName fromLexicalQName​(java.lang.String lexicalName,
                                               boolean useDefault,
                                               boolean allowEQName,
                                               NamespaceResolver resolver)
                                        throws XPathException
        Make a structured QName from a lexical QName, using a supplied NamespaceResolver to resolve the prefix
        Parameters:
        lexicalName - the QName as a lexical name (prefix:local), or (Q{uri}local) if allowEQName is set to true. Leading and trailing whitespace is ignored.
        useDefault - set to true if an absent prefix implies use of the default namespace; set to false if an absent prefix implies no namespace
        allowEQName - true if the EQName syntax Q{uri}local is acceptable
        resolver - NamespaceResolver used to look up a URI for the prefix
        Returns:
        the StructuredQName object corresponding to this lexical QName
        Throws:
        XPathException - if the namespace prefix is not in scope or if the value is lexically invalid. Error code FONS0004 is set if the namespace prefix has not been declared; error code FOCA0002 is set if the name is lexically invalid. These may need to be changed on return depending on the caller's requirements.

      • fromEQName

        public static StructuredQName fromEQName​(java.lang.String eqName)
        Make a structured QName from an EQName in Q{uri}local format.
        Parameters:
        eqName - the QName as an EQName (Q{uri}local), or an unqualified local name. The format of the local name is not checked.
        Returns:
        the StructuredQName object corresponding to this EQName
        Throws:
        java.lang.IllegalArgumentException - if the eqName syntax is invalid (but the format of the URI and local name parts are not checked)

      • getPrefix

        public java.lang.String getPrefix()
        Get the prefix of the QName.
        Returns:
        the prefix. Returns the empty string if the name is unprefixed.

      • getURI

        public java.lang.String getURI()
        Get the namespace URI of the QName.
        Returns:
        the URI. Returns the empty string to represent the no-namespace

      • hasURI

        public boolean hasURI​(java.lang.String uri)
        Test whether the URI is equal to some constant
        Parameters:
        uri - the namespace URI to be tested
        Returns:
        true if the namespace URI of this QName is equal to the supplied URI

      • getLocalPart

        public java.lang.String getLocalPart()
        Get the local part of the QName
        Returns:
        the local part of the QName

      • getDisplayName

        public java.lang.String getDisplayName()
        Get the display name, that is the lexical QName in the form [prefix:]local-part
        Returns:
        the lexical QName

      • getStructuredQName

        public StructuredQName getStructuredQName()
        Get the name as a StructuredQName (which it already is; but this satisfies the NodeName interface)
        Returns:
        the name as a StructuredQName

      • getClarkName

        public java.lang.String getClarkName()
        Get the expanded QName in Clark format, that is "{uri}local" if it is in a namespace, or just "local" otherwise.
        Returns:
        the QName in Clark notation

      • getEQName

        public java.lang.String getEQName()
        Get the expanded QName as an EQName, that is "Q{uri}local" for a name in a namespace, or "Q{}local" otherwise
        Returns:
        the QName in EQName notation

      • toString

        public java.lang.String toString()
        The toString() method displays the QName as a lexical QName, that is prefix:local
        Overrides:
        toString in class java.lang.Object
        Returns:
        the lexical QName

      • equals

        public boolean equals​(java.lang.Object other)
        Compare two StructuredQName values for equality. This compares the URI and local name parts, excluding any prefix
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Get a hashcode to reflect the equals() method.

        The hashcode is based on the URI and local part only, ignoring the prefix. In fact the URI plays little part in computing the hashcode, because the URI is often long, and largely redundant: QNames with the same local name will rarely have different URIs, and there are significant performance savings in the NamePool if a cheaper hashcode is used. So the only contribution from the URI is that we take its length into account.

        Overrides:
        hashCode in class java.lang.Object
        Returns:
        a hashcode used to distinguish distinct QNames

      • computeHashCode

        public static int computeHashCode​(java.lang.CharSequence uri,
                                  java.lang.CharSequence local)
        Expose the hashCode algorithm so that other implementations of QNames can construct a compatible hashcode
        Parameters:
        uri - the namespace URI
        local - the local name
        Returns:
        a hash code computed from the URI and local name

      • toJaxpQName

        public javax.xml.namespace.QName toJaxpQName()
        Convert the StructuredQName to a javax.xml.namespace.QName
        Returns:
        an object of class javax.xml.namespace.QName representing this qualified name

      • getNamespaceBinding

        public NamespaceBinding getNamespaceBinding()
        Get the NamespaceBinding (prefix/uri pair) corresponding to this name
        Returns:
        a NamespaceBinding containing the prefix and URI present in this QName

      • isIdentical

        public boolean isIdentical​(IdentityComparable other)
        Determine whether two IdentityComparable objects are identical. This is a stronger test than equality (even schema-equality); for example two dateTime values are not identical unless they are in the same timezone. In the case of a StructuredQName, the identity test compares prefixes as well as the namespace URI and local name.
        Specified by:
        isIdentical in interface IdentityComparable
        Parameters:
        other - the value to be compared with
        Returns:
        true if the two values are identical, false otherwise

      • identityHashCode

        public int identityHashCode()
        Get a hashCode that offers the guarantee that if A.isIdentical(B), then A.identityHashCode() == B.identityHashCode()
        Specified by:
        identityHashCode in interface IdentityComparable
        Returns:
        a hashCode suitable for use when testing for identity.