net.sf.saxon.s9api
Class XQueryExecutable

java.lang.Object
  extended by net.sf.saxon.s9api.XQueryExecutable

public class XQueryExecutable
extends Object

An XQueryExecutable represents the compiled form of a query. To execute the query, it must first be loaded to form an XQueryEvaluator.

An XQueryExecutable is immutable, and therefore thread-safe. It is simplest to load a new XQueryEvaluator each time the query is to be run. However, the XQueryEvaluator is serially reusable within a single thread.

An XQueryExecutable is created by using one of the compile methods on the XQueryCompiler class.

Since:
9.0

Constructor Summary
protected XQueryExecutable(Processor processor, XQueryExpression exp)
           
 
Method Summary
 OccurrenceIndicator getResultCardinality()
          Get the statically-determined cardinality of the result of the query.
 ItemType getResultItemType()
          Get the ItemType of the items in the result of the query, as determined by static analysis.
 XQueryExpression getUnderlyingCompiledQuery()
          Get the underlying implementation object representing the compiled stylesheet.
 boolean isUpdateQuery()
          Ask whether the query is an updating query: that is, whether it returns a Pending Update List rather than a Value.
 XQueryEvaluator load()
          Load the stylesheet to prepare it for execution.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

XQueryExecutable

protected XQueryExecutable(Processor processor,
                           XQueryExpression exp)
Method Detail

load

public XQueryEvaluator load()
Load the stylesheet to prepare it for execution.

Returns:
An XsltTransformer. The returned XsltTransformer can be used to set up the dynamic context for stylesheet evaluation, and to run the stylesheet.

getResultItemType

public ItemType getResultItemType()
Get the ItemType of the items in the result of the query, as determined by static analysis. This is the most precise ItemType that the processor is able to determine from static examination of the query; the actual items in the query result are guaranteed to belong to this ItemType or to a subtype of this ItemType.

Returns:
the statically-determined ItemType of the result of the query
Since:
9.1

getResultCardinality

public OccurrenceIndicator getResultCardinality()
Get the statically-determined cardinality of the result of the query. This is the most precise cardinality that the processor is able to determine from static examination of the query.

Returns:
the statically-determined cardinality of the result of the query
Since:
9.1

isUpdateQuery

public boolean isUpdateQuery()
Ask whether the query is an updating query: that is, whether it returns a Pending Update List rather than a Value. Note that queries using the XUpdate copy-modify syntax are not considered to be updating queries.

Returns:
true if the query is an updating query, false if not
Since:
9.1

getUnderlyingCompiledQuery

public XQueryExpression getUnderlyingCompiledQuery()
Get the underlying implementation object representing the compiled stylesheet. This provides an escape hatch into lower-level APIs. The object returned by this method may change from release to release.

Returns:
the underlying implementation of the compiled stylesheet


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.