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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.event;
import net.sf.saxon.Configuration;
import net.sf.saxon.s9api.Location;
import net.sf.saxon.om.NamePool;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.trans.Timer;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.tiny.TinyDocumentImpl;
import net.sf.saxon.type.SchemaType;
/**
* The abstract Builder class is responsible for taking a stream of SAX events
* and constructing a Document tree. There is one concrete subclass for each
* tree implementation.
*
*/
public abstract class Builder implements Receiver {
/**
* Constant denoting a request for the default tree model
*/
public static final int UNSPECIFIED_TREE_MODEL = -1;
/**
* Constant denoting the "linked tree" in which each node is represented as an object
*/
public static final int LINKED_TREE = 0;
/**
* Constant denoting the "tiny tree" in which the tree is represented internally using arrays of integers
*/
public static final int TINY_TREE = 1;
/**
* Constant denoting the "tiny tree condensed", a variant of the tiny tree in which text and attribute nodes
* sharing the same string value use shared storage for the value.
*/
public static final int TINY_TREE_CONDENSED = 2;
public static final int JDOM_TREE = 3;
public static final int JDOM2_TREE = 4;
public static final int AXIOM_TREE = 5;
public static final int DOMINO_TREE = 6;
/**
* Constant denoting the "mutable linked tree" in which each node is represented as an object
*/
public static final int MUTABLE_LINKED_TREE = 7;
protected PipelineConfiguration pipe;
protected Configuration config;
protected NamePool namePool;
protected String systemId;
protected String baseURI;
protected boolean uniformBaseURI = true;
protected NodeInfo currentRoot;
protected boolean lineNumbering = false;
protected boolean useEventLocation = true;
protected boolean started = false;
protected boolean timing = false;
protected boolean opened = false;
private long startTime;
/**
* Create a Builder and initialise variables
*/
public Builder() {
}
public Builder(PipelineConfiguration pipe) {
this.pipe = pipe;
config = pipe.getConfiguration();
lineNumbering = config.isLineNumbering();
namePool = config.getNamePool();
}
@Override
public void setPipelineConfiguration(/*@NotNull*/ PipelineConfiguration pipe) {
this.pipe = pipe;
config = pipe.getConfiguration();
lineNumbering = lineNumbering || config.isLineNumbering();
namePool = config.getNamePool();
}
/*@NotNull*/
@Override
public PipelineConfiguration getPipelineConfiguration() {
return pipe;
}
/**
* Get the Configuration
*
* @return the Saxon configuration
*/
/*@NotNull*/
public Configuration getConfiguration() {
return config;
}
/**
* Get a builder monitor for this builder. This must be called immediately after opening the builder,
* and all events to the builder must thenceforth be sent via the BuilderMonitor.
*
* @return a new BuilderMonitor appropriate to this kind of Builder; or null if the Builder does
* not provide this service. The default implementation returns null.
*/
/*@Nullable*/
public BuilderMonitor getBuilderMonitor() {
return null;
}
/**
* Say that the system IDs of constructed nodes (especially element nodes) are to be
* taken from the system ID property of the {@link Location} object passed as a parameter to
* the {@link Outputter#startElement(NodeName, SchemaType, Location, int)} event. This property
* should be set to true when building a document from events originating with an XML parser,
* because the {@link Location} object in this case will have a system ID that changes
* as external entities are processed. The base URI of a node in this case is determined
* by the system ID, modified by any xml:base attributes. If the property
* is set to false, all nodes in the tree have the same system ID, this being supplied
* as the systemID property of the builder. This will typically be the static base URI
* of the instruction in the query or stylesheet that was used to construct the root node;
* in the case of xsl:result-document, it will be the absolutized value of the
* href attribute of the instruction.
* @param useEventLocation true if the system ID is to be taken from the Location parameter of
* each event. The default value is true.
*/
public void setUseEventLocation(boolean useEventLocation) {
this.useEventLocation = useEventLocation;
}
/**
* Ask whether the system IDs of constructed nodes (especially element nodes) are to be
* taken from the system ID property of the {@link Location} object passed as a parameter to
* the {@link Outputter#startElement(NodeName, SchemaType, Location, int)} event.
* @return true if the system ID is to be taken from the Location parameter of
* each event. The default value is true.
*/
public boolean isUseEventLocation() {
return useEventLocation;
}
/**
* The SystemId is equivalent to the document-uri property defined in the XDM data model.
* It should be set only in the case of a document that is potentially retrievable via this URI.
* This means it should not be set in the case of a temporary tree constructed in the course of
* executing a query or transformation.
*
* @param systemId the SystemId, that is, the document-uri.
*/
@Override
public void setSystemId(/*@Nullable*/ String systemId) {
this.systemId = systemId;
}
/**
* The SystemId is equivalent to the document-uri property defined in the XDM data model.
* It should be set only in the case of a document that is potentially retrievable via this URI.
* This means the value will be null in the case of a temporary tree constructed in the course of
* executing a query or transformation.
*
* @return the SystemId, that is, the document-uri.
*/
/*@Nullable*/
@Override
public String getSystemId() {
return systemId;
}
/**
* Set the base URI of the document node of the tree being constructed by this builder
*
* @param baseURI the base URI
*/
public void setBaseURI(/*@Nullable*/ String baseURI) {
this.baseURI = baseURI;
}
/**
* Get the base URI of the document node of the tree being constructed by this builder
*
* @return the base URI
*/
/*@Nullable*/
public String getBaseURI() {
return baseURI;
}
/////////////////////////////////////////////////////////////////////////
// Methods setting and getting options for building the tree
/////////////////////////////////////////////////////////////////////////
/**
* Set line numbering on or off
*
* @param lineNumbering set to true if line numbers are to be maintained for nodes in the tree being
* constructed.
*/
public void setLineNumbering(boolean lineNumbering) {
this.lineNumbering = lineNumbering;
}
/**
* Set timing option on or off
*
* @param on set to true to turn timing on. This causes the builder to display statistical information
* about the tree that is constructed. It corresponds to the command line -t option
*/
public void setTiming(boolean on) {
timing = on;
}
/**
* Get timing option
*
* @return true if timing information has been requested
*/
public boolean isTiming() {
return timing;
}
@Override
public void open() {
if (timing && !opened) {
String sysId = getSystemId();
if (sysId == null) {
sysId = "(unknown systemId)";
}
getConfiguration().getLogger().info(
"Building tree for " + sysId + " using " + getClass());
startTime = System.nanoTime();
}
opened = true;
}
@Override
public void close() throws XPathException {
if (timing && opened) {
long endTime = System.nanoTime();
getConfiguration().getLogger().info(
"Tree built in " + Timer.showExecutionTimeNano(endTime - startTime));
if (currentRoot instanceof TinyDocumentImpl) {
((TinyDocumentImpl) currentRoot).showSize();
}
startTime = endTime;
}
opened = false;
}
/**
* Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations
* supplied on element and attribute events
*
* @return true if the Receiver makes any use of this information. If false, the caller
* may supply untyped nodes instead of supplying the type annotation
*/
@Override
public boolean usesTypeAnnotations() {
return true;
}
/**
* Get the current root node. This will normally be a document node, but if the root of the tree
* is an element node, it can be an element.
*
* @return the root of the tree that is currently being built, or that has been most recently built
* using this builder
*/
/*@Nullable*/
public NodeInfo getCurrentRoot() {
return currentRoot;
}
/**
* Reset the builder to its initial state. The most important effect of calling this
* method (implemented in subclasses) is to release any links to the constructed document
* tree, allowing the memory occupied by the tree to released by the garbage collector even
* if the Builder is still in memory. This can happen because the Builder is referenced from a
* parser in the Configuration's parser pool.
*/
public void reset() {
systemId = null;
baseURI = null;
currentRoot = null;
lineNumbering = false;
started = false;
timing = false;
opened = false;
}
}