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The XSLT and XQuery Processor
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.s9api;
import net.sf.saxon.event.*;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.TreeModel;
import net.sf.saxon.serialize.SerializationProperties;
import net.sf.saxon.transpile.CSharpModifiers;
import java.net.URI;
/**
* An XdmDestination is a {@link Destination} in which an {@link XdmNode}
* is constructed to hold the output of a query or transformation:
* that is, a tree using Saxon's implementation of the XDM data model
* No data needs to be supplied to the XdmDestination object. The query or transformation
* populates an XdmNode, which may then be retrieved using the getXdmNode
* method.
* An XdmDestination is designed to hold a single tree rooted at a document node.
* If the result of a query is an arbitrary sequence, it will be normalized according to the rules
* of the "sequence normalization" operation described in the W3C XSLT/XQuery Serialization
* Recommendation, which results in either a single document node, or an error.
* An XdmDestination can be reused to hold the results of a second query or transformation only
* if the {@link #reset} method is first called to reset its state.
* If an XDM tree is to be built from a lexical XML document, or programmatically from the application
* by writing a sequence of events, the recommended mechanism is to use a {@link DocumentBuilder} rather
* than this class.
* @since 9.1. Changed in 9.9 to perform sequence normalization, so the result is always a single
* document node. To get the raw results of a query or stylesheet without sequence normalization,
* use a {@link RawDestination}.
*/
@CSharpModifiers(code = {"internal"})
public class XdmDestination extends AbstractDestination {
TreeModel treeModel = TreeModel.TINY_TREE;
Builder builder;
public XdmDestination() { }
/**
* Set the base URI for the document node that will be created when the XdmDestination is written to.
* This method must be called before writing to the destination; it has no effect on an XdmNode that
* has already been constructed.
*
* @param baseURI the base URI for the node that will be constructed when the XdmDestination is written to.
* This must be an absolute URI
* @throws IllegalArgumentException if the baseURI supplied is not an absolute URI
* @since 9.1
*/
public void setBaseURI(URI baseURI) {
if (!baseURI.isAbsolute()) {
throw new IllegalArgumentException("Supplied base URI must be absolute");
}
setDestinationBaseURI(baseURI);
}
/**
* Get the base URI that will be used for the document node when the XdmDestination is written to.
*
* @return the base URI that will be used for the node that is constructed when the XdmDestination is written to.
* @since 9.1
*/
public URI getBaseURI() {
return getDestinationBaseURI();
}
/**
* Set the tree model to be used for documents constructed using this XdmDestination.
* By default, the TinyTree is used.
*
* @param model typically one of the constants {@link net.sf.saxon.om.TreeModel#TINY_TREE},
* {@link TreeModel#TINY_TREE_CONDENSED}, or {@link TreeModel#LINKED_TREE}. However, in principle
* a user-defined tree model can be used.
* @since 9.2
*/
public void setTreeModel(TreeModel model) {
this.treeModel = model;
}
/**
* Get the tree model to be used for documents constructed using this XdmDestination.
* By default, the TinyTree is used.
*
* @return the tree model in use: typically one of the constants {@link net.sf.saxon.om.TreeModel#TINY_TREE},
* {@link net.sf.saxon.om.TreeModel#TINY_TREE_CONDENSED}, or {@link TreeModel#LINKED_TREE}. However, in principle
* a user-defined tree model can be used.
* @since 9.2
*/
public TreeModel getTreeModel() {
return treeModel;
}
/**
* Return a Receiver. Saxon calls this method to obtain a Receiver, to which it then sends
* a sequence of events representing the content of an XML document.
*
* @param pipe The Saxon configuration. This is supplied so that the destination can
* use information from the configuration (for example, a reference to the name pool)
* to construct or configure the returned Receiver.
* @param params The serialization properties requested. Largely irrelevant for this {@code Destination},
* except perhaps for {@code item-separator}.
* @return the Receiver to which events are to be sent.
*/
@Override
public Receiver getReceiver(PipelineConfiguration pipe, SerializationProperties params) {
TreeModel model = treeModel;
if (model == null) {
int m = pipe.getParseOptions().getTreeModel();
if (m != Builder.UNSPECIFIED_TREE_MODEL) {
model = TreeModel.getTreeModel(m);
}
if (model == null) {
model = TreeModel.TINY_TREE;
}
}
builder = model.makeBuilder(pipe);
String systemId = getBaseURI() == null ? null : getBaseURI().toASCIIString();
if (systemId != null) {
builder.setUseEventLocation(false);
builder.setBaseURI(systemId);
}
SequenceNormalizer sn = params.makeSequenceNormalizer(builder);
sn.setSystemId(systemId);
sn.onClose(helper.getListeners());
return sn;
//return new TracingFilter(sn);
}
/**
* Close the destination, allowing resources to be released. Saxon calls this method when
* it has finished writing to the destination.
*/
@Override
public void close() {
// no action
}
/**
* Return the node at the root of the tree, after it has been constructed.
* This method should not be called while the tree is under construction.
*
* @return the root node of the tree (always a document or element node); or null if
* nothing is written to the tree (for example, the result of a query that returns the
* empty sequence)
* @throws IllegalStateException if called during the execution of the process that
* is writing the tree.
*/
public XdmNode getXdmNode() {
if (builder == null) {
throw new IllegalStateException("The document has not yet been built");
}
NodeInfo node = builder.getCurrentRoot();
return node == null ? null : (XdmNode) XdmValue.wrap(node);
}
/**
* Allow the XdmDestination to be reused, without resetting other properties
* of the destination.
*/
public void reset() {
builder = null;
}
}