com.saxonica.trans

Class AccumulatorManagerPE

java.lang.Object

com.saxonica.trans.AccumulatorManagerPE

All Implemented Interfaces:

IAccumulatorManager

Direct Known Subclasses:

AccumulatorManagerEE

public class AccumulatorManagerPE
extends Object
implements IAccumulatorManager

Manager for accumulator functions (XSLT 3.0).

In principle there is a dataset containing accumulator values for every accumulator/document pair. In addition, if the same stylesheet is run concurrently in multiple transformations, and a document is shared between these transformations, the data values for the accumulator can differ between the two transformations, because the accumulator rules can depend on values of stylesheet parameters or on context variables such as current-dateTime.

It is important that the accumulator data for a tree does not cause the tree to be locked in memory for the duration of a transformation. We therefore keep a weak reference to the tree. For each tree, until it is garbage collected, there is a map from accumulator names to accumulator data.

Constructor Summary

Constructors

Constructor and Description
AccumulatorManagerPE()

Method Summary

Methods

Modifier and Type	Method and Description
void	addAccumulatorData(TreeInfo doc, Accumulator acc, IAccumulatorData accData) Add the accumulator data for a particular accumulator, if it does not already exist
void	copyAccumulatorData(NodeInfo item, VirtualCopy vc) Copy the accumulator data for a subtree (unstreamed) when making a virtual copy of the subtree
IAccumulatorData	getAccumulatorData(TreeInfo doc, Accumulator acc, XPathContext context) Get the data relating to a particular accumulator for a particular unstreamed document tree

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AccumulatorManagerPE

public AccumulatorManagerPE()

Method Detail

getAccumulatorData

public IAccumulatorData getAccumulatorData(TreeInfo doc,
                                  Accumulator acc,
                                  XPathContext context)
                                    throws XPathException

Get the data relating to a particular accumulator for a particular unstreamed document tree

Parameters:

doc - the source document tree in question

acc - the required accumulator

context - the XPath dynamic evaluation context

Returns:

a data structure holding the evaluated values of the accumulator for this source document

Throws:

XPathException - if any dynamic error occurs

addAccumulatorData

public void addAccumulatorData(TreeInfo doc,
                      Accumulator acc,
                      IAccumulatorData accData)

Add the accumulator data for a particular accumulator, if it does not already exist

Parameters:

doc - the document/tree whose accumulator data is being added

acc - the accumulator in question

accData - the data holding the values of the accumulator for the nodes in this tree

copyAccumulatorData

public void copyAccumulatorData(NodeInfo item,
                       VirtualCopy vc)
                         throws XPathException

Copy the accumulator data for a subtree (unstreamed) when making a virtual copy of the subtree

Parameters:

item - the root of the subtree

vc - the virtual copy being created

Throws:

XPathException