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net.sf.saxon.evpull
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<H2>
Package net.sf.saxon.evpull
</H2>
This package provides classes that implement a StAX-like pull pipeline in which a recieving component
makes calls on a provider component to supply information from the XML stream one event at a time.
<P>
<B>See:</B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
<P>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Interface Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A></B></TD>
<TD>An iterator over a sequence of events</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventMappingFunction.html" title="interface in net.sf.saxon.evpull">EventMappingFunction</A></B></TD>
<TD>EventMappingFunction is an interface that must be satisfied by an object passed to an
EventMappingIterator.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull">PullEvent</A></B></TD>
<TD>A PullEvent is one of the following:
An item (that is, a node or an atomic value)
A startElement, endElement, startDocument, or endDocument event
An EventIterator, representing a sequence of PullEvents
</TD>
</TR>
</TABLE>
<P>
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Class Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/BlockEventIterator.html" title="class in net.sf.saxon.evpull">BlockEventIterator</A></B></TD>
<TD>Iterate over the instructions in a Block, concatenating the result of each instruction
into a single combined sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/BracketedDocumentIterator.html" title="class in net.sf.saxon.evpull">BracketedDocumentIterator</A></B></TD>
<TD>The class is an EventIterator that handles the events arising from a document node constructor:
that is, the start/end event pair for the document node, bracketing a sequence of events for the
content of the document.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/BracketedElementIterator.html" title="class in net.sf.saxon.evpull">BracketedElementIterator</A></B></TD>
<TD>The class is an EventIterator that handles the events arising from an element constructor:
that is, the start/end event pair for the element node, bracketing a sequence of events for the
content of the element.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/ComplexContentProcessor.html" title="class in net.sf.saxon.evpull">ComplexContentProcessor</A></B></TD>
<TD>The ComplexContentProcessor is an EventIterator that deals with the events occurring between
a startElement and endElement (or startDocument and endDocument) according to the XSLT/XQuery
rules for constructing complex content.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/Decomposer.html" title="class in net.sf.saxon.evpull">Decomposer</A></B></TD>
<TD>This class takes a sequence of pull events and turns it into fully-decomposed form, that is, it
takes and document and element nodes in the sequence and turns them into a subsequence consisting of a
start element|document event, a content sequence, and an end element|document event, recursively.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EmptyEventIterator.html" title="class in net.sf.saxon.evpull">EmptyEventIterator</A></B></TD>
<TD>This class is an EventIterator over an empty sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EndDocumentEvent.html" title="class in net.sf.saxon.evpull">EndDocumentEvent</A></B></TD>
<TD>Pull event representing the end of a document</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EndElementEvent.html" title="class in net.sf.saxon.evpull">EndElementEvent</A></B></TD>
<TD>Pull event representing the end of an element node</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventAnnotationStripper.html" title="class in net.sf.saxon.evpull">EventAnnotationStripper</A></B></TD>
<TD>This class is an EventIterator that filters a stream of pull events setting
the type annotation on element nodes to xs:untyped and on attribute nodes to
xs:untypedAtomic</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventIteratorOverSequence.html" title="class in net.sf.saxon.evpull">EventIteratorOverSequence</A></B></TD>
<TD>This class maps a SequenceIterator to an EventIterator, by simply returning the items in the sequence
as PullEvents.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventIteratorToReceiver.html" title="class in net.sf.saxon.evpull">EventIteratorToReceiver</A></B></TD>
<TD>Class to read pull events from an EventIterator and write them to a Receiver</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventMappingIterator.html" title="class in net.sf.saxon.evpull">EventMappingIterator</A></B></TD>
<TD>MappingIterator merges a sequence of sequences into a single sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventStackIterator.html" title="class in net.sf.saxon.evpull">EventStackIterator</A></B></TD>
<TD>An EventStackIterator is an EventIterator that delivers a flat sequence of PullEvents
containing no nested EventIterators</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/EventToStaxBridge.html" title="class in net.sf.saxon.evpull">EventToStaxBridge</A></B></TD>
<TD>This class bridges EventIterator events to XMLStreamReader (Stax) events.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/NamespaceMaintainer.html" title="class in net.sf.saxon.evpull">NamespaceMaintainer</A></B></TD>
<TD>NamespaceMaintainer is an EventIterator responsible for maintaining namespace context in an
event stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/PullEventSource.html" title="class in net.sf.saxon.evpull">PullEventSource</A></B></TD>
<TD>A PullSource is a JAXP Source that encapsulates a PullProvider - that is, an object
that supplies an XML document as a sequence of events that are read under the control
of the recipient.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/PullEventTracer.html" title="class in net.sf.saxon.evpull">PullEventTracer</A></B></TD>
<TD>Diagnostic class to display the sequence of events reported by an EventIterator</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/SequenceComposer.html" title="class in net.sf.saxon.evpull">SequenceComposer</A></B></TD>
<TD>This class takes a sequence of pull events and composes them into a sequence of items.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/SingletonEventIterator.html" title="class in net.sf.saxon.evpull">SingletonEventIterator</A></B></TD>
<TD>This class represents an EventIterator over a sequence containing a single pull event.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/StartDocumentEvent.html" title="class in net.sf.saxon.evpull">StartDocumentEvent</A></B></TD>
<TD>A PullEvent representing the start of a document node</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/StartElementEvent.html" title="class in net.sf.saxon.evpull">StartElementEvent</A></B></TD>
<TD>This is a PullEvent representing the start of an element node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/StaxToEventBridge.html" title="class in net.sf.saxon.evpull">StaxToEventBridge</A></B></TD>
<TD>This class implements the Saxon EventIterator API on top of a standard StAX parser
(or any other StAX XMLStreamReader implementation)</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../net/sf/saxon/evpull/TracingEventIterator.html" title="class in net.sf.saxon.evpull">TracingEventIterator</A></B></TD>
<TD>This class is a filter for a sequence of pull events; it returns the input sequence unchanged,
but traces execution to System.err</TD>
</TR>
</TABLE>
<P>
<A NAME="package_description"><!-- --></A><H2>
Package net.sf.saxon.evpull Description
</H2>
<P>
<p>This package provides classes that implement a StAX-like pull pipeline in which a recieving component
makes calls on a provider component to supply information from the XML stream one event at a time. The
object that is supplied in response to these calls is a <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull"><CODE>PullEvent</CODE></A>, and
a component that can be invoked to deliver a sequence of these objects is a <A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull"><CODE>EventIterator</CODE></A>.</p>
<p>An <A HREF="../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull"><CODE>EventIterator</CODE></A> is itself a <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull"><CODE>PullEvent</CODE></A>, so an event provider
may return a sequence of events in response to a single call by returning an iterator. A sequence of events containing
no iterators is referred to as a <i>flat</i> sequence, and any sequence of events can be converted to a flat
sequence by inserting an <A HREF="../../../../net/sf/saxon/evpull/EventStackIterator.html" title="class in net.sf.saxon.evpull"><CODE>EventStackIterator</CODE></A> into the pipeline.</p>
<p>Pull processing is not used extensively in Saxon, and is generally not used at all unless explicitly
requested. It can be requested, for example, by supplying a <A HREF="../../../../net/sf/saxon/evpull/PullEventSource.html" title="class in net.sf.saxon.evpull"><CODE>PullEventSource</CODE></A> object to an interface
that expects an XML document to be supplied as a JAXP <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/Source.html?is-external=true" title="class or interface in javax.xml.transform"><CODE>Source</CODE></A>. It is also used
in XQJ when methods such as <A HREF="../../../../javax/xml/xquery/XQDataFactory.html#createItemFromDocument(java.lang.String, java.lang.String, javax.xml.xquery.XQItemType)"><CODE>XQDataFactory.createItemFromDocument(java.lang.String, java.lang.String, javax.xml.xquery.XQItemType)</CODE></A> are used
to construct an XML document from a supplied <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/stream/XMLStreamReader.html?is-external=true" title="class or interface in javax.xml.stream"><CODE>XMLStreamReader</CODE></A>. In such cases
Saxon uses the class <A HREF="../../../../net/sf/saxon/evpull/StaxToEventBridge.html" title="class in net.sf.saxon.evpull"><CODE>StaxToEventBridge</CODE></A> to convert StAX events to its own
<A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull"><CODE>PullEvent</CODE></A> events. Conversion in the opposite direction uses the class
<A HREF="../../../../net/sf/saxon/evpull/EventToStaxBridge.html" title="class in net.sf.saxon.evpull"><CODE>EventToStaxBridge</CODE></A>.</p>
<p>It is possible to request pull-mode evaluation of XQuery code using the method
<A HREF="../../../../net/sf/saxon/query/XQueryExpression.html#iterateEvents(net.sf.saxon.Controller, net.sf.saxon.query.DynamicQueryContext)"><CODE>XQueryExpression.iterateEvents(net.sf.saxon.Controller, net.sf.saxon.query.DynamicQueryContext)</CODE></A>. This causes any document and element
node constructors to be evaluated in pull mode, returning events representing start/end document/element
rather than actually constructing the result tree in memory. The relevant expressions in the expression
tree provide an <code>iterateEvents()</code> method to support this mode of execution.</p>
<p>A sequence of events is said to be <i>composed</i> if it consists entirely of items (that is, a node
is passed as a single event, rather than by walking the tree); it is said to be <i>decomposed</i>
if if consists entirely of StAX-like events. In general, the classes in this package handle sequences
that mix both styles. A fully-composed sequence, however, is normally handled using the
<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om"><CODE>SequenceIterator</CODE></A> interface rather than by the classes in this package.
The <A HREF="../../../../net/sf/saxon/evpull/SequenceComposer.html" title="class in net.sf.saxon.evpull"><CODE>SequenceComposer</CODE></A> returns a full composed event stream
from a decomposed or mixed stream, constructing tree fragments when
necessary to achieve this; the <A HREF="../../../../net/sf/saxon/evpull/Decomposer.html" title="class in net.sf.saxon.evpull"><CODE>Decomposer</CODE></A>
does the inverse, walking any tree fragments to deliver the corresponding start-element and end-element
events.</p>
<p>The class <A HREF="../../../../net/sf/saxon/evpull/EventIteratorOverSequence.html" title="class in net.sf.saxon.evpull"><CODE>EventIteratorOverSequence</CODE></A> converts a stream of items obtained
from a <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om"><CODE>SequenceIterator</CODE></A> into a composed stream of <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull"><CODE>PullEvent</CODE></A> events.</p>
<p>The class <A HREF="../../../../net/sf/saxon/evpull/EventIteratorToReceiver.html" title="class in net.sf.saxon.evpull"><CODE>EventIteratorToReceiver</CODE></A> reads a sequence of events from a pull pipeline
and outputs the same sequence of events to a push pipeline using the <A HREF="../../../../net/sf/saxon/event/Receiver.html" title="interface in net.sf.saxon.event"><CODE>Receiver</CODE></A>
interface.</p>
<p>The package <A HREF="../../../../net/sf/saxon/pull/package-summary.html"><CODE>net.sf.saxon.pull</CODE></A> represents an earlier attempt at pull-mode processing in Saxon.
It is retained because it provides some capabilities not yet present in this package.</p>
<hr>
<p align="center"><i>Michael H. Kay<br/>
Saxonica Limited<br/>
30 July 2010</i></p>
<P>
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