Class NamespaceDifferencer
- java.lang.Object
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- net.sf.saxon.event.SequenceReceiver
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- net.sf.saxon.event.ProxyReceiver
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- net.sf.saxon.event.NamespaceDifferencer
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- All Implemented Interfaces:
javax.xml.transform.Result,Receiver
public class NamespaceDifferencer extends ProxyReceiver
NamespaceDifferencer is a
ProxyReceiverresponsible for removing duplicate namespace declarations. It also ensures that namespace undeclarations are emitted when necessary.The NamespaceDifferencer assumes that in the input event stream, all in-scope namespaces for every element are accounted for in the call on namespace(). In the output event stream, the namespace() call represents namespace declarations rather than in-scope namespaces. So (a) redundant namespaces are removed, and (b) namespace undeclarations are added where necessary. A namespace undeclaration for the default namespace is always added if the parent element has a default namespace and the child element does not; namespace undeclarations for other namespaces are emitted only when the serialization option undeclare-namespaces is set.
The
NamespaceDifferenceris part of the serialization pipeline, responsible for translating result trees to serialized XML. As such, it is not concerned with operations such as namespace fixup and namespace inheritance that are part of the result tree construction process.The
NamespaceDifferenceris also needed when writing output to tree models such as DOM and JDOM that require local namespace declarations to be provided for each element node.
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Field Summary
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Fields inherited from class net.sf.saxon.event.ProxyReceiver
nextReceiver
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Fields inherited from class net.sf.saxon.event.SequenceReceiver
pipelineConfiguration, previousAtomic, systemId
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Constructor Summary
Constructors Constructor Description NamespaceDifferencer(Receiver next, java.util.Properties details)Create a NamespaceDeclarer
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidendElement()End of elementvoidstartElement(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties)startElement.-
Methods inherited from class net.sf.saxon.event.ProxyReceiver
append, characters, close, comment, endDocument, getNamePool, getNextReceiver, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, startDocument, usesTypeAnnotations
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Methods inherited from class net.sf.saxon.event.SequenceReceiver
append, decompose, flatten, getConfiguration, getErrorCodeForDecomposingFunctionItems, getPipelineConfiguration, getSystemId, handlesAppend
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Constructor Detail
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NamespaceDifferencer
public NamespaceDifferencer(Receiver next, java.util.Properties details)
Create a NamespaceDeclarer- Parameters:
next- the Receiver to which events will be passed after namespace reduction
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Method Detail
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startElement
public void startElement(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties) throws XPathException
startElement. This call removes redundant namespace declarations, and possibly adds an xmlns="" undeclaration.- Specified by:
startElementin interfaceReceiver- Overrides:
startElementin classProxyReceiver- Parameters:
elemName- the name of the element.type- the type annotation of the element.attributes- the attributes of this elementnamespaces- the in-scope namespaces of this element: generally this is all the in-scope namespaces, without relying on inheriting namespaces from parent elementslocation- an object providing information about the module, line, and column where the node originatedproperties- bit-significant properties of the element node. If there are no relevant properties, zero is supplied. The definitions of the bits are in classReceiverOption- Throws:
XPathException- if an error occurs
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endElement
public void endElement() throws XPathExceptionDescription copied from class:ProxyReceiverEnd of element- Specified by:
endElementin interfaceReceiver- Overrides:
endElementin classProxyReceiver- Throws:
XPathException- if an error occurs
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