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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.tree.linked;
import net.sf.saxon.Configuration;
import net.sf.saxon.event.Builder;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.om.*;
import net.sf.saxon.s9api.Location;
import net.sf.saxon.str.UnicodeString;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.transpile.CSharpSuppressWarnings;
import net.sf.saxon.tree.iter.AxisIterator;
import net.sf.saxon.tree.iter.NodeListIterator;
import net.sf.saxon.type.AnyType;
import net.sf.saxon.type.SchemaType;
import net.sf.saxon.type.Type;
import net.sf.saxon.type.Untyped;
import net.sf.saxon.value.Whitespace;
import net.sf.saxon.z.IntHashMap;
import java.util.*;
/**
* A node in the XML parse tree representing the Document itself (or equivalently, the root
* node of the Document).
* A DocumentImpl object may either represent a real document node, or it may represent an imaginary
* container for a parentless element.
*
*/
public final class DocumentImpl extends ParentNodeImpl implements TreeInfo, MutableDocumentInfo {
//private static int nextDocumentNumber = 0;
private ElementImpl documentElement;
/*@Nullable*/ private HashMap idTable;
private long documentNumber;
private String baseURI;
private HashMap entityTable;
private Set nilledElements;
private Set topWithinEntityElements;
private IntHashMap> elementList;
private HashMap userData;
private Configuration config;
private LineNumberMap lineNumberMap;
private SystemIdMap systemIdMap = new SystemIdMap();
private boolean imaginary;
private boolean mutable;
private SpaceStrippingRule spaceStrippingRule = NoElementsSpaceStrippingRule.getInstance();
/**
* Create a DocumentImpl
*/
public DocumentImpl() {
setRawParent(null);
}
/**
* Get the NodeInfo object representing the document node at the root of the tree
*
* @return the document node
*/
@Override
public NodeInfo getRootNode() {
return this;
}
/**
* Set the Configuration that contains this document
*
* @param config the Saxon configuration
*/
public void setConfiguration(/*@NotNull*/ Configuration config) {
this.config = config;
documentNumber = config.getDocumentNumberAllocator().allocateDocumentNumber();
}
/**
* Get the configuration previously set using setConfiguration
*
* @return the Saxon configuration
*/
@Override
public Configuration getConfiguration() {
return config;
}
/**
* Ask whether the tree is mutable. This is true only if {@link #setMutable(boolean) has been called
* supplying the value {@code true}}
* @return true if and only if the tree has been marked as mutable
*/
@Override
public boolean isMutable() {
return mutable;
}
/**
* Say whether the tree is mutable.
*
* @param mutable true if and only if the tree is to be marked as mutable
*/
public void setMutable(boolean mutable) {
this.mutable = mutable;
}
/**
* Get the name pool used for the names in this document
*/
@Override
public NamePool getNamePool() {
return config.getNamePool();
}
/**
* Get a Builder suitable for building nodes that can be attached to this document.
*
* @return a new TreeBuilder
*/
/*@NotNull*/
@Override
public Builder newBuilder() {
LinkedTreeBuilder builder = new LinkedTreeBuilder(config.makePipelineConfiguration());
builder.setAllocateSequenceNumbers(false);
return builder;
}
/**
* Set whether this is an imaginary document node
*
* @param imaginary if true, this is an imaginary node - the tree is really rooted at the topmost element
*/
public void setImaginary(boolean imaginary) {
this.imaginary = imaginary;
}
/**
* Ask whether this is an imaginary document node
*
* @return true if this is an imaginary node - the tree is really rooted at the topmost element
*/
public boolean isImaginary() {
return imaginary;
}
/**
* Ask whether the document contains any nodes whose type annotation is anything other than
* UNTYPED
*
* @return true if the document contains elements whose type is other than UNTYPED
*/
@Override
public boolean isTyped() {
return documentElement != null && documentElement.getSchemaType() != Untyped.getInstance();
}
/**
* Get the unique document number
*/
@Override
public long getDocumentNumber() {
return documentNumber;
}
/**
* Set the top-level element of the document (variously called the root element or the
* document element). Note that a DocumentImpl may represent the root of a result tree
* fragment, in which case there is no document element.
*
* @param e the top-level element
*/
public void setDocumentElement(ElementImpl e) {
documentElement = e;
}
/**
* Copy the system ID and line number map from another document
* (used when grafting a simplified stylesheet)
*
* @param original the document whose system ID and line number maps are to be grafted
* onto this tree
*/
public void graftLocationMap(/*@NotNull*/ DocumentImpl original) {
systemIdMap = original.systemIdMap;
lineNumberMap = original.lineNumberMap;
}
/**
* Set the system id (base URI) of this node
*/
@Override
public void setSystemId(String /*@Nullable*/uri) {
if (uri == null) {
uri = "";
}
systemIdMap.setSystemId(getRawSequenceNumber(), uri);
}
/**
* Get the system id of this root node
*/
@Override
public String getSystemId() {
return systemIdMap.getSystemId(getRawSequenceNumber());
}
/**
* Set the base URI of this document node
*
* @param uri the new base URI
*/
public void setBaseURI(String uri) {
baseURI = uri;
}
/**
* Get the base URI of this root node.
*
* @return the base URI
*/
@Override
public String getBaseURI() {
if (baseURI != null) {
return baseURI;
}
return getSystemId();
}
/**
* Set the system id of an element in the document
*
* @param seq the sequence number of the element
* @param uri the system identifier (base URI) of the element
*/
void setSystemId(int seq, String /*@Nullable*/uri) {
if (uri == null) {
uri = "";
}
systemIdMap.setSystemId(seq, uri);
}
/**
* Get the system id of an element in the document
*
* @param seq the sequence number of the element
* @return the systemId (base URI) of the element
*/
String getSystemId(int seq) {
return systemIdMap.getSystemId(seq);
}
/**
* Set line numbering on
*/
public void setLineNumbering() {
lineNumberMap = new LineNumberMap();
lineNumberMap.setLineAndColumn(getRawSequenceNumber(), 0, -1);
}
/**
* Set the line number for an element. Ignored if line numbering is off.
*
* @param sequence the sequence number of the element
* @param line the line number of the element
* @param column the column number of the element
*/
void setLineAndColumn(int sequence, int line, int column) {
if (lineNumberMap != null && sequence >= 0) {
lineNumberMap.setLineAndColumn(sequence, line, column);
}
}
/**
* Get the line number for an element.
*
* @param sequence the sequence number of the element
* @return the line number for an element. Return -1 if line numbering is off, or if
* the element was added subsequent to document creation by use of XQuery update
*/
int getLineNumber(int sequence) {
if (lineNumberMap != null && sequence >= 0) {
return lineNumberMap.getLineNumber(sequence);
}
return -1;
}
/**
* Get the column number for an element.
*
* @param sequence the sequence number of the element
* @return the column number for an element. Return -1 if line numbering is off, or if
* the element was added subsequent to document creation by use of XQuery update
*/
int getColumnNumber(int sequence) {
if (lineNumberMap != null && sequence >= 0) {
return lineNumberMap.getColumnNumber(sequence);
}
return -1;
}
/**
* Add a nilled element. Nilled elements are unusual, so we avoid allocating a boolean in the element node;
* instead we keep a list of nilled elements at the document level
* @param element a nilled element
*/
public void addNilledElement(ElementImpl element) {
if (nilledElements == null) {
nilledElements = new HashSet<>();
}
nilledElements.add(element);
}
/**
* Ask if a given element is nilled
* @param element the element about which we want to ask
* @return true if the element is in the list of nilled elements
*/
boolean isNilledElement(ElementImpl element) {
return nilledElements != null && nilledElements.contains(element);
}
public void markTopWithinEntity(ElementImpl element) {
if (topWithinEntityElements == null) {
topWithinEntityElements = new HashSet<>();
}
topWithinEntityElements.add(element);
}
public boolean isTopWithinEntity(ElementImpl element) {
return topWithinEntityElements != null && topWithinEntityElements.contains(element);
}
/**
* Get the line number of this root node.
*
* @return 0 always
*/
@Override
public int getLineNumber() {
return 0;
}
/**
* Return the type of node.
*
* @return Type.DOCUMENT (always)
*/
@Override
public final int getNodeKind() {
return Type.DOCUMENT;
}
/**
* Get next sibling - always null
*
* @return null
*/
@Override
public /*@Nullable*/ final NodeImpl getNextSibling() {
return null;
}
/**
* Get previous sibling - always null
*
* @return null
*/
/*@Nullable*/
@Override
public final NodeImpl getPreviousSibling() {
return null;
}
/**
* Get the root (outermost) element.
*
* @return the Element node for the outermost element of the document.
* May return null if the document node contains no element node.
*/
public ElementImpl getDocumentElement() {
return documentElement;
}
/**
* Get the root node
*
* @return the NodeInfo representing the root of this tree
*/
/*@NotNull*/
@Override
public NodeInfo getRoot() {
return this;
}
/**
* Get the physical root of the tree. This may be an imaginary document node: this method
* should be used only when control information held at the physical root is required
*
* @return the document node, which may be imaginary
*/
/*@NotNull*/
@Override
public DocumentImpl getPhysicalRoot() {
return this;
}
/**
* Get a character string that uniquely identifies this node
*
* @param buffer a buffer into which will be placed a string based on the document number
*/
@Override
public void generateId(/*@NotNull*/ StringBuilder buffer) {
buffer.append('d');
buffer.append(documentNumber);
}
/**
* Get a list of all elements with a given name fingerprint
*
* @param fingerprint the fingerprint of the required element name
* @return an iterator over all the elements with this name
*/
/*@NotNull*/
AxisIterator getAllElements(int fingerprint) {
if (elementList == null) {
elementList = new IntHashMap<>(500);
}
IntHashMap> eList = elementList;
List list = eList.get(fingerprint);
if (list == null) {
list = new ArrayList<>(500);
NodeImpl next = getNextInDocument(this);
while (next != null) {
if (next.getNodeKind() == Type.ELEMENT &&
next.getFingerprint() == fingerprint) {
list.add(next);
}
next = next.getNextInDocument(this);
}
eList.put(fingerprint, list);
}
return new NodeListIterator(list);
}
/**
* Remove a node from any indexes when it is detached from the tree
*
* @param node the node to be removed from all indexes
*/
public void deIndex(/*@NotNull*/ NodeImpl node) {
if (node instanceof ElementImpl) {
IntHashMap> eList = elementList;
if (eList != null) {
List list = eList.get(node.getFingerprint());
if (list == null) {
return;
}
list.remove(node);
}
if (node.isId()) {
deregisterID(node.getStringValue());
}
} else if (node instanceof AttributeImpl) {
if (node.isId()) {
deregisterID(node.getStringValue());
}
}
}
/**
* Index all the ID attributes. This is done the first time the id() function
* is used on this document, or the first time that id() is called after a sequence of updates
*/
private void indexIDs() {
if (idTable != null) {
return; // ID's are already indexed
}
idTable = new HashMap<>(256);
NodeImpl curr = this;
NodeImpl root = curr;
while (curr != null) {
if (curr.getNodeKind() == Type.ELEMENT) {
//noinspection ConstantConditions
ElementImpl e = (ElementImpl) curr;
if (e.isId()) {
registerID(e, Whitespace.trim(e.getStringValue()));
}
AttributeMap atts = e.attributes();
for (AttributeInfo att : atts) {
if (att.isId() && NameChecker.isValidNCName(Whitespace.trim(att.getValue()))) {
// don't index any invalid IDs - these can arise when using a non-validating parser
registerID(e, Whitespace.trim(att.getValue()));
}
}
}
curr = curr.getNextInDocument(root);
}
}
/**
* Register a unique element ID. Does nothing if there is already an element with that ID.
*
* @param e The Element having a particular unique ID value
* @param id The unique ID value
*/
void registerID(NodeInfo e, String id) {
// the XPath spec (5.2.1) says ignore the second ID if it's not unique
if (idTable == null) {
idTable = new HashMap<>(256);
}
HashMap table = idTable;
table.putIfAbsent(id, e);
}
/**
* Get the element with a given ID.
*
* @param id The unique ID of the required element, previously registered using registerID()
* @param getParent true if the requirement is for the parent of the node with the given ID,
* not the node itself.
* @return The NodeInfo for the given ID if one has been registered, otherwise null.
*/
@Override
public NodeInfo/*@Nullable*/ selectID(String id, boolean getParent) {
if (idTable == null) {
indexIDs();
}
assert idTable != null;
NodeInfo node = idTable.get(id);
if (node != null && getParent && node.isId() && node.getUnicodeStringValue().equals(id)) {
node = node.getParent();
}
return node;
}
/**
* Remove the entry for a given ID (when nodes are deleted). Does nothing if the id value is not
* present in the index.
*
* @param id The id value
*/
void deregisterID(String id) {
id = Whitespace.trim(id);
if (idTable != null) {
idTable.remove(id);
}
}
/**
* Set an unparsed entity URI associated with this document. For system use only, while
* building the document.
*
* @param name the entity name
* @param uri the system identifier of the unparsed entity
* @param publicId the public identifier of the unparsed entity
*/
public void setUnparsedEntity(String name, String uri, String publicId) {
// System.err.println("setUnparsedEntity( " + name + "," + uri + ")");
if (entityTable == null) {
entityTable = new HashMap<>(10);
}
String[] ids = new String[2];
ids[0] = uri;
ids[1] = publicId;
entityTable.put(name, ids);
}
/**
* Get the list of unparsed entities defined in this document
*
* @return an Iterator, whose items are of type String, containing the names of all
* unparsed entities defined in this document. If there are no unparsed entities or if the
* information is not available then an empty iterator is returned
*/
@Override
public Iterator getUnparsedEntityNames() {
if (entityTable == null) {
List ls = Collections.emptyList();
return ls.iterator();
} else {
return entityTable.keySet().iterator();
}
}
/**
* Get the unparsed entity with a given name
*
* @param name the name of the entity
* @return if the entity exists, return an array of two Strings, the first holding the system ID
* of the entity, the second holding the public ID if there is one, or null if not. If the entity
* does not exist, return null.
*/
/*@Nullable*/
@Override
public String[] getUnparsedEntity(String name) {
if (entityTable == null) {
return null;
}
return entityTable.get(name);
}
/**
* Get the type annotation
*
* @return the type annotation of the base node
*/
@Override
public SchemaType getSchemaType() {
if (documentElement == null || documentElement.getSchemaType() == Untyped.getInstance()) {
return Untyped.getInstance();
} else {
return AnyType.getInstance();
}
}
/**
* Copy this node to a given outputter
*/
@Override
@CSharpSuppressWarnings("UnsafeIteratorConversion")
public void copy(/*@NotNull*/ Receiver out, int copyOptions, Location locationId) throws XPathException {
out.startDocument(CopyOptions.getStartDocumentProperties(copyOptions));
// copy any unparsed entities
for (Iterator names = getUnparsedEntityNames(); names.hasNext(); ) {
String name = names.next();
String[] details = getUnparsedEntity(name);
assert details != null;
out.setUnparsedEntity(name, details[0], details[1]);
}
// copy the children
NodeImpl next = getFirstChild();
while (next != null) {
next.copy(out, copyOptions, locationId);
next = next.getNextSibling();
}
out.endDocument();
}
/**
* Replace the string-value of this node
*
* @param stringValue the new string value
*/
@Override
public void replaceStringValue(UnicodeString stringValue) {
throw new UnsupportedOperationException("Cannot replace the value of a document node");
}
/**
* This method is called before performing a batch of updates; it allows all cached data that
* might be invalidated by such updates to be cleared
*/
@Override
public void resetIndexes() {
idTable = null;
elementList = null;
}
/**
* Set details of space stripping action that was applied to this document during
* construction. This ensures that space stripping is not applied twice to the same
* document.
*
* @param rule details of the space stripping rules that have been applied to this
* document during its construction.
* @since 9.9
*/
@Override
public void setSpaceStrippingRule(SpaceStrippingRule rule) {
this.spaceStrippingRule = rule;
}
/**
* Get details of space stripping action that was applied to this document during
* construction. This ensures that space stripping is not applied twice to the same
* document.
*
* @return details of the space stripping rules that have been applied to this
* document during its construction. By default, returns {@link NoElementsSpaceStrippingRule},
* indicating that no space stripping has been applied
* @since 9.9
*/
@Override
public SpaceStrippingRule getSpaceStrippingRule() {
return spaceStrippingRule;
}
/**
* Set user data on the document node. The user data can be retrieved subsequently
* using {@link #getUserData}
*
* @param key A string giving the name of the property to be set. Clients are responsible
* for choosing a key that is likely to be unique. Must not be null. Keys used internally
* by Saxon are prefixed "saxon:".
* @param value The value to be set for the property. May be null, which effectively
* removes the existing value for the property.
*/
@Override
public void setUserData(String key, Object value) {
/*@Nullable*/
if (userData == null) {
userData = new HashMap<>(4);
}
if (value == null) {
userData.remove(key);
} else {
userData.put(key, value);
}
}
/**
* Get user data held in the document node. This retrieves properties previously set using
* {@link #setUserData}
*
* @param key A string giving the name of the property to be retrieved.
* @return the value of the property, or null if the property has not been defined.
*/
/*@Nullable*/
@Override
public Object getUserData(String key) {
if (userData == null) {
return null;
} else {
return userData.get(key);
}
}
}