Package net.sf.saxon.event
Class NamespaceReducer
- 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.NamespaceReducer
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- 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.
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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 NamespaceReducer(Receiver next)
Create a NamespaceReducer
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
endElement()
endElement: Discard the namespaces declared on this element.java.lang.String
getURIForPrefix(java.lang.String prefix, boolean useDefault)
Get the namespace URI corresponding to a given prefix.java.util.Iterator<java.lang.String>
iteratePrefixes()
Get an iterator over all the prefixes declared in this namespace context.void
namespace(NamespaceBinding namespaceBinding, int properties)
Output a namespace node (binding)void
startContent()
startContent: Add any namespace undeclarations needed to stop namespaces being inherited from parent elementsvoid
startElement(NodeName elemName, SchemaType typeCode, int locationId, int properties)
startElement.-
Methods inherited from class net.sf.saxon.event.ProxyReceiver
append, attribute, characters, close, comment, endDocument, getNamePool, getUnderlyingReceiver, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, startDocument, usesTypeAnnotations
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Methods inherited from class net.sf.saxon.event.SequenceReceiver
append, getConfiguration, getPipelineConfiguration, getSystemId
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Constructor Detail
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NamespaceReducer
public NamespaceReducer(Receiver next)
Create a NamespaceReducer- 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 typeCode, int locationId, int properties) throws XPathException
startElement. This call removes redundant namespace declarations, and possibly adds an xmlns="" undeclaration.- Specified by:
startElement
in interfaceReceiver
- Overrides:
startElement
in classProxyReceiver
- 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 aLocationProvider
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
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namespace
public void namespace(NamespaceBinding namespaceBinding, int properties) throws XPathException
Output a namespace node (binding)- Specified by:
namespace
in interfaceReceiver
- Overrides:
namespace
in classProxyReceiver
- Parameters:
namespaceBinding
- the prefix/uri pair to be outputproperties
- the properties of the namespace binding- Throws:
XPathException
- if any downstream error occurs
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startContent
public void startContent() throws XPathException
startContent: Add any namespace undeclarations needed to stop namespaces being inherited from parent elements- Specified by:
startContent
in interfaceReceiver
- Overrides:
startContent
in classProxyReceiver
- Throws:
XPathException
- if an error occurs
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endElement
public void endElement() throws XPathException
endElement: Discard the namespaces declared on this element.- Specified by:
endElement
in interfaceReceiver
- Overrides:
endElement
in classProxyReceiver
- Throws:
XPathException
- if an error occurs
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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 interfaceNamespaceResolver
- Parameters:
prefix
- the namespace prefixuseDefault
- 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
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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 interfaceNamespaceResolver
- 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
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