Class PullFilter
- java.lang.Object
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- net.sf.saxon.pull.PullFilter
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- All Implemented Interfaces:
PullProvider
- Direct Known Subclasses:
DocumentWrappingPullProvider,ElementNameTracker,PullNamespaceReducer,PullPushTee,PullTracer
public class PullFilter extends java.lang.Object implements PullProvider
PullFilter is a pass-through filter class that links one PullProvider to another PullProvider in a pipeline. This class passes all events through completely unchanged. The class is designed so that subclasses can modify this behavior by altering some of the events.
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Nested Class Summary
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Nested classes/interfaces inherited from interface net.sf.saxon.pull.PullProvider
PullProvider.Event
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Field Summary
Fields Modifier and Type Field Description protected PullProvider.EventcurrentEvent
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Constructor Summary
Constructors Constructor Description PullFilter(PullProvider base)Create a PullFilter
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidclose()Close the event reader.PullProvider.Eventcurrent()Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd().AtomicValuegetAtomicValue()Get an atomic value.AttributeMapgetAttributes()Get the attributes associated with the current element.NamePoolgetNamePool()Helper method to get the current namePoolNamespaceBinding[]getNamespaceDeclarations()Get the namespace declarations associated with the current element.NodeNamegetNodeName()Get the NodeName identifying the name of the current node.PipelineConfigurationgetPipelineConfiguration()Get configuration information.SchemaTypegetSchemaType()Get the type annotation of the current attribute or element node, or atomic value.LocationgetSourceLocator()Get the location of the current event.java.lang.CharSequencegetStringValue()Get the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.PullProvidergetUnderlyingProvider()Get the underlying PullProviderjava.util.List<UnparsedEntity>getUnparsedEntities()Get a list of unparsed entities.PullProvider.Eventnext()Get the next event.voidsetPipelineConfiguration(PipelineConfiguration pipe)Set configuration information.PullProvider.EventskipToMatchingEnd()Skip the current subtree.
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Field Detail
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currentEvent
protected PullProvider.Event currentEvent
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Constructor Detail
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PullFilter
public PullFilter(PullProvider base)
Create a PullFilter- Parameters:
base- the PullProvider to which requests are to be passed
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Method Detail
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setPipelineConfiguration
public void setPipelineConfiguration(PipelineConfiguration pipe)
Set configuration information. This must only be called before any events have been read.- Specified by:
setPipelineConfigurationin interfacePullProvider- Parameters:
pipe- the pipeline configuration
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getPipelineConfiguration
public PipelineConfiguration getPipelineConfiguration()
Get configuration information.- Specified by:
getPipelineConfigurationin interfacePullProvider- Returns:
- the pipeline configuration
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getNamePool
public final NamePool getNamePool()
Helper method to get the current namePool- Returns:
- the NamePool
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getUnderlyingProvider
public PullProvider getUnderlyingProvider()
Get the underlying PullProvider- Returns:
- the underlying PullProvider
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next
public PullProvider.Event next() throws XPathException
Get the next event.Note that a subclass that overrides this method is responsible for ensuring that current() works properly. This can be achieved by setting the field currentEvent to the event returned by any call on next().
- Specified by:
nextin interfacePullProvider- Returns:
- an integer code indicating the type of event. The code
PullProvider.Event.END_OF_INPUTis returned at the end of the sequence. - Throws:
XPathException- if a dynamic error occurs
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current
public PullProvider.Event current()
Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd(). This method does not change the position of the PullProvider.- Specified by:
currentin interfacePullProvider- Returns:
- the current event
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getAttributes
public AttributeMap getAttributes() throws XPathException
Get the attributes associated with the current element. This method must be called only after a START_ELEMENT event has been notified. The contents of the returned AttributeMap are immutable.Attributes may be read before or after reading the namespaces of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().
- Specified by:
getAttributesin interfacePullProvider- Returns:
- an AttributeMap representing the attributes of the element that has just been notified.
- Throws:
XPathException- if a dynamic error occurs
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getNamespaceDeclarations
public NamespaceBinding[] getNamespaceDeclarations() throws XPathException
Get the namespace declarations associated with the current element. This method must be called only after a START_ELEMENT event has been notified. In the case of a top-level START_ELEMENT event (that is, an element that either has no parent node, or whose parent is not included in the sequence being read), the NamespaceDeclarations object returned will contain a namespace declaration for each namespace that is in-scope for this element node. In the case of a non-top-level element, the NamespaceDeclarations will contain a set of namespace declarations and undeclarations, representing the differences between this element and its parent.It is permissible for this method to return namespace declarations that are redundant.
The NamespaceDeclarations object is guaranteed to remain unchanged until the next START_ELEMENT event, but may then be overwritten. The object should not be modified by the client.
Namespaces may be read before or after reading the attributes of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().
- Specified by:
getNamespaceDeclarationsin interfacePullProvider- Returns:
- the namespace declarations associated with the current START_ELEMENT event.
- Throws:
XPathException- if a dynamic error occurs
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skipToMatchingEnd
public PullProvider.Event skipToMatchingEnd() throws XPathException
Skip the current subtree. This method may be called only immediately after a START_DOCUMENT or START_ELEMENT event. This call returns the matching END_DOCUMENT or END_ELEMENT event; the next call on next() will return the event following the END_DOCUMENT or END_ELEMENT.- Specified by:
skipToMatchingEndin interfacePullProvider- Returns:
- the matching END_DOCUMENT or END_ELEMENT event
- Throws:
XPathException- if a dynamic error occurs
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close
public void close()
Close the event reader. This indicates that no further events are required. It is not necessary to close an event reader afterPullProvider.Event.END_OF_INPUThas been reported, but it is recommended to close it if reading terminates prematurely. Once an event reader has been closed, the effect of further calls on next() is undefined.- Specified by:
closein interfacePullProvider
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getNodeName
public NodeName getNodeName()
Description copied from interface:PullProviderGet the NodeName identifying the name of the current node. This method can be used after thePullProvider.Event.START_ELEMENT,PullProvider.Event.PROCESSING_INSTRUCTION,PullProvider.Event.ATTRIBUTE, orPullProvider.Event.NAMESPACEevents. With some PullProvider implementations, it can also be used afterPullProvider.Event.END_ELEMENT, but this is not guaranteed. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is null.- Specified by:
getNodeNamein interfacePullProvider- Returns:
- the NodeName. The NodeName can be used to obtain the prefix, local name, and namespace URI.
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getStringValue
public java.lang.CharSequence getStringValue() throws XPathExceptionGet the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.In other situations the result is undefined and may result in an IllegalStateException.
If the most recent event was a
PullProvider.Event.START_ELEMENT, this method causes the content of the element to be read. The next event notified will be the correspondingPullProvider.Event.END_ELEMENT.- Specified by:
getStringValuein interfacePullProvider- Returns:
- the String Value of the node in question, defined according to the rules in the XPath data model.
- Throws:
XPathException- if a dynamic error occurs
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getAtomicValue
public AtomicValue getAtomicValue()
Get an atomic value. This call may be used only when the last event reported was ATOMIC_VALUE. This indicates that the PullProvider is reading a sequence that contains a free-standing atomic value; it is never used when reading the content of a node.- Specified by:
getAtomicValuein interfacePullProvider- Returns:
- the atomic value
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getSchemaType
public SchemaType getSchemaType()
Get the type annotation of the current attribute or element node, or atomic value. The result of this method is undefined unless the most recent event was START_ELEMENT, ATTRIBUTE, or ATOMIC_VALUE.- Specified by:
getSchemaTypein interfacePullProvider- Returns:
- the type annotation.
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getSourceLocator
public Location getSourceLocator()
Get the location of the current event. For an event stream representing a real document, the location information should identify the location in the lexical XML source. For a constructed document, it should identify the location in the query or stylesheet that caused the node to be created. A value of null can be returned if no location information is available.- Specified by:
getSourceLocatorin interfacePullProvider- Returns:
- the SourceLocator giving the location of the current event, or null if no location information is available
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getUnparsedEntities
public java.util.List<UnparsedEntity> getUnparsedEntities()
Get a list of unparsed entities.- Specified by:
getUnparsedEntitiesin interfacePullProvider- Returns:
- a list of unparsed entities, or null if the information is not available, or an empty list if there are no unparsed entities.
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