net.sf.saxon.event

Class NamespaceReducer

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 Summary
NamespaceReducer()
Create a NamespaceReducer
NamespaceReducer(Receiver base)
Create a NamespaceReducer with a given destination Receiver
Method Summary
voidendElement()
endElement: Discard the namespaces declared on this element.
protected shortgetURICode(short prefixCode)
Get the URI code corresponding to a given prefix code, by searching the in-scope namespaces.
StringgetURIForPrefix(String prefix, boolean useDefault)
Get the namespace URI corresponding to a given prefix.
IteratoriteratePrefixes()
Get an iterator over all the prefixes declared in this namespace context.
voidnamespace(int namespaceCode, int properties)
Output a namespace node (binding)
voidstartContent()
startContent: Add any namespace undeclarations needed to stop namespaces being inherited from parent elements
voidstartElement(int nameCode, int typeCode, int locationId, int properties)
startElement.

Constructor Detail

NamespaceReducer

public NamespaceReducer()
Create a NamespaceReducer

NamespaceReducer

public NamespaceReducer(Receiver base)
Create a NamespaceReducer with a given destination Receiver

Parameters: base the Receiver to which events will be passed after namespace reduction

Method Detail

endElement

public void endElement()
endElement: Discard the namespaces declared on this element.

getURICode

protected short getURICode(short prefixCode)
Get the URI code corresponding to a given prefix code, by searching the in-scope namespaces. This is a service provided to subclasses.

Parameters: prefixCode the 16-bit prefix code required

Returns: the 16-bit URI code, or -1 if the prefix is not found

getURIForPrefix

public String getURIForPrefix(String prefix, boolean useDefault)
Get the namespace URI corresponding to a given prefix. Return null if the prefix is not in scope.

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 Iterator 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

namespace

public void namespace(int namespaceCode, int properties)
Output a namespace node (binding)

Parameters: namespaceCode encapsulates the prefix and URI properties the properties of the namespace binding

Throws: XPathException

startContent

public void startContent()
startContent: Add any namespace undeclarations needed to stop namespaces being inherited from parent elements

startElement

public void startElement(int nameCode, int typeCode, int locationId, int properties)
startElement. This call removes redundant namespace declarations, and possibly adds an xmlns="" undeclaration.