Class NamespaceReducer

  • All Implemented Interfaces:
    javax.xml.transform.Result, Receiver, NamespaceResolver

    public class NamespaceReducer
    extends ProxyReceiver
    implements NamespaceResolver
    NamespaceReducer is a ProxyReceiver responsible for removing duplicate namespace declarations. It also ensures that an xmlns="" undeclaration is output when necessary. Used on its own, the NamespaceReducer simply eliminates unwanted namespace declarations. It can also be subclassed, in which case the subclass can use the services of the NamespaceReducer to resolve QNames.

    The NamespaceReducer also validates namespace-sensitive content.

    • Constructor Detail

      • NamespaceReducer

        public NamespaceReducer​(Receiver next)
        Create a NamespaceReducer
        Parameters:
        next - the Receiver to which events will be passed after namespace reduction
    • Method Detail

      • startElement

        public void startElement​(NodeName elemName,
                                 SchemaType typeCode,
                                 int locationId,
                                 int properties)
                          throws XPathException
        startElement. This call removes redundant namespace declarations, and possibly adds an xmlns="" undeclaration.
        Specified by:
        startElement in interface Receiver
        Overrides:
        startElement in class ProxyReceiver
        Parameters:
        elemName - integer code identifying the name of the element within the name pool.
        typeCode - integer code identifying the element's type within the name pool.
        locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
        properties - properties of the element node
        Throws:
        XPathException - if an error occurs
      • getURIForPrefix

        public java.lang.String getURIForPrefix​(java.lang.String prefix,
                                                boolean useDefault)
        Get the namespace URI corresponding to a given prefix. Return null if the prefix is not in scope.
        Specified by:
        getURIForPrefix in interface NamespaceResolver
        Parameters:
        prefix - the namespace prefix
        useDefault - true if the default namespace is to be used when the prefix is ""
        Returns:
        the uri for the namespace, or null if the prefix is not in scope
      • iteratePrefixes

        public java.util.Iterator<java.lang.String> iteratePrefixes()
        Get an iterator over all the prefixes declared in this namespace context. This will include the default namespace (prefix="") and the XML namespace where appropriate
        Specified by:
        iteratePrefixes in interface NamespaceResolver
        Returns:
        an iterator over all the prefixes for which a namespace binding exists, including the zero-length string to represent the null/absent prefix if it is bound