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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.option.xom;
import net.sf.saxon.Configuration;
import net.sf.saxon.om.*;
import net.sf.saxon.type.Type;
import nu.xom.Attribute;
import nu.xom.Document;
import nu.xom.Element;
import nu.xom.Node;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
/**
* The root node of an XPath tree. (Or equivalently, the tree itself).
* This class is used not only for a document, but also for the root
* of a document-less tree fragment.
*
* @author Michael H. Kay
* @author Wolfgang Hoschek (ported net.sf.saxon.jdom to XOM)
*/
public class XOMDocumentWrapper extends XOMNodeWrapper implements TreeInfo {
protected Configuration config;
protected long documentNumber;
private HashMap idIndex;
private SpaceStrippingRule spaceStrippingRule = NoElementsSpaceStrippingRule.getInstance();
private HashMap userData;
/**
* Create a Saxon wrapper for a XOM root node
*
* @param root The XOM root node
* @param config The configuration which defines the name pool used for all
* names in this tree
*/
public XOMDocumentWrapper(Node root, Configuration config) {
super(root, null, 0);
if (root.getParent() != null) {
throw new IllegalArgumentException("root node must not have a parent node");
}
docWrapper = this;
treeInfo = this;
setConfiguration(config);
}
/**
* Get the NodeInfo object representing the document node at the root of the tree
*
* @return the document node
*/
@Override
public NodeInfo getRootNode() {
return this;
}
/**
* Wrap a node in the XOM document.
*
* @param node The node to be wrapped. This must be a node in the same
* document (the system does not check for this).
* @return the wrapping NodeInfo object
*/
public NodeInfo wrap(Node node) {
if (node == this.node) {
return this;
}
return makeWrapper(node, this);
}
/**
* Set the configuration, which defines the name pool used for all names in
* this document. This is always called after a new document has been
* created. The implementation must register the name pool with the
* document, so that it can be retrieved using getNamePool(). It must also
* call NamePool.allocateDocumentNumber(), and return the relevant document
* number when getDocumentNumber() is subsequently called.
*
* @param config The configuration to be used
*/
public void setConfiguration(Configuration config) {
this.config = config;
documentNumber = config.getDocumentNumberAllocator().allocateDocumentNumber();
}
/**
* Get the configuration previously set using setConfiguration
*/
@Override
public Configuration getConfiguration() {
return config;
}
/**
* Get the name pool used for the names in this document
*
* @return the name pool in which all the names used in this document are
* registered
*/
@Override
public NamePool getNamePool() {
return config.getNamePool();
}
@Override
public void setSystemId(String uri) {
((Document)node).setBaseURI(uri);
}
/**
* Get the unique document number for this document (the number is unique
* for all documents within a NamePool)
*
* @return the unique number identifying this document within the name pool
*/
@Override
public long getDocumentNumber() {
return documentNumber;
}
/**
* Get the element with a given ID, if any
*
* @param id the required ID value
* @param getParent true if the parent of the element of type ID is requird
* @return the element with the given ID, or null if there is no such ID
* present (or if the parser has not notified attributes as being of
* type ID).
*/
/*@Nullable*/
@Override
public NodeInfo selectID(String id, boolean getParent) {
if (idIndex == null) {
Element elem;
switch (nodeKind) {
case Type.DOCUMENT:
elem = ((Document) node).getRootElement();
break;
case Type.ELEMENT:
elem = (Element) node;
break;
default:
return null;
}
idIndex = new HashMap<>(50);
buildIDIndex(elem);
}
return idIndex.get(id);
}
private void buildIDIndex(Element elem) {
// walk the tree in reverse document order, to satisfy the XPath 1.0 rule
// that says if an ID appears twice, the first one wins
for (int i = elem.getChildCount(); --i >= 0; ) {
Node child = elem.getChild(i);
if (child instanceof Element) {
buildIDIndex((Element) child);
}
}
for (int i = elem.getAttributeCount(); --i >= 0; ) {
Attribute att = elem.getAttribute(i);
if (att.getType() == Attribute.Type.ID) {
idIndex.put(att.getValue(), wrap(elem));
}
}
}
/**
* 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() {
return Collections.emptyIterator();
}
/**
* Get the unparsed entity with a given name
*
* @param name the name of the entity
* @return null: XOM does not provide access to unparsed entities
*/
@Override
public String[] getUnparsedEntity(String name) {
return 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) {
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.
*/
@Override
public Object getUserData(String key) {
if (userData == null) {
return null;
} else {
return userData.get(key);
}
}
}