Package net.sf.saxon.event
Class NamespaceReducer
java.lang.Object
net.sf.saxon.event.SequenceReceiver
net.sf.saxon.event.ProxyReceiver
net.sf.saxon.event.NamespaceReducer
- All Implemented Interfaces:
Result
,Receiver
,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.
-
Field Summary
Fields inherited from class net.sf.saxon.event.ProxyReceiver
nextReceiver
Fields inherited from class net.sf.saxon.event.SequenceReceiver
pipelineConfiguration, previousAtomic, systemId
Fields inherited from interface javax.xml.transform.Result
PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING
-
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
endElement: Discard the namespaces declared on this element.protected short
getURICode
(short prefixCode) Get the URI code corresponding to a given prefix code, by searching the in-scope namespaces.getURIForPrefix
(String prefix, boolean useDefault) Get the namespace URI corresponding to a given prefix.Get an iterator over all the prefixes declared in this namespace context.void
namespace
(int namespaceCode, int properties) Notify a namespace.void
startContent: Add any namespace undeclarations needed to stop namespaces being inherited from parent elementsvoid
startElement
(int nameCode, int typeCode, int locationId, int properties) startElement.Methods inherited from class net.sf.saxon.event.ProxyReceiver
attribute, characters, close, comment, endDocument, getConfiguration, getDocumentLocator, getNamePool, getUnderlyingReceiver, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, startDocument
Methods inherited from class net.sf.saxon.event.SequenceReceiver
append, getPipelineConfiguration, getSystemId
-
Constructor Details
-
NamespaceReducer
public NamespaceReducer()
-
-
Method Details
-
startElement
public void startElement(int nameCode, int 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:
nameCode
- 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
-
namespace
Description copied from class:ProxyReceiver
Notify a namespace. Namespaces are notified after the startElement event, and before any children for the element. The namespaces that are reported are only required to include those that are different from the parent element; however, duplicates may be reported. A namespace must not conflict with any namespaces already used for element or attribute names.- Specified by:
namespace
in interfaceReceiver
- Overrides:
namespace
in classProxyReceiver
- Parameters:
namespaceCode
- an integer: the top half is a prefix code, the bottom half a URI code. These may be translated into an actual prefix and URI using the name pool. A prefix code of zero represents the empty prefix (that is, the default namespace). A URI code of zero represents a URI of "", that is, a namespace undeclaration.properties
- The most important property is REJECT_DUPLICATES. If this property is set, the namespace declaration will be rejected if it conflicts with a previous declaration of the same prefix. If the property is not set, the namespace declaration will be ignored if it conflicts with a previous declaration. This reflects the fact that when copying a tree, namespaces for child elements are emitted before the namespaces of their parent element. Unfortunately this conflicts with the XSLT rule for complex content construction, where the recovery action in the event of conflicts is to take the namespace that comes last. XSLT therefore doesn't recover from this error: it sets the REJECT_DUPLICATES flag, and this is treated as a hard error.- Throws:
XPathException
-
startContent
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
-
endElement
endElement: Discard the namespaces declared on this element.- Specified by:
endElement
in interfaceReceiver
- Overrides:
endElement
in classProxyReceiver
- Throws:
XPathException
-
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
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
-
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
-