package net.sf.saxon.xom;
import java.lang.reflect.Method;
import java.util.HashMap;
import net.sf.saxon.Configuration;
import net.sf.saxon.om.DocumentInfo;
import net.sf.saxon.om.NamePool;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.type.Type;
import nu.xom.Attribute;
import nu.xom.Document;
import nu.xom.Element;
import nu.xom.Node;
/**
* The root node of an XPath tree. (Or equivalently, the tree itself).
* <P>
* 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 DocumentWrapper extends NodeWrapper implements DocumentInfo {
protected Configuration config;
protected String baseURI;
protected int documentNumber;
private HashMap idIndex;
/**
* Create a Saxon wrapper for a XOM root node
*
* @param root
* The XOM root node
* @param baseURI
* The base URI for all the nodes in the tree
* @param config
* The configuration which defines the name pool used for all
* names in this tree
*/
public DocumentWrapper(Node root, String baseURI, Configuration config) {
super(root, null, 0);
if (root.getParent() != null)
throw new IllegalArgumentException("root node must not have a parent node");
this.baseURI = baseURI;
this.docWrapper = this;
setConfiguration(config);
}
/**
* 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;
this.documentNumber = allocateDocumentNumber(config);
}
/**
* Get the configuration previously set using setConfiguration
*/
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
*/
public NamePool getNamePool() {
return config.getNamePool();
}
/**
* 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
*/
public int getDocumentNumber() {
return documentNumber;
}
/**
* Get the element with a given ID, if any
*
* @param id
* the required ID value
* @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).
*/
public NodeInfo selectID(String id) {
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 (NodeInfo) 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 unparsed entity with a given name
*
* @param name
* the name of the entity
* @return null: XOM does not provide access to unparsed entities
* @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.
*/
public String[] getUnparsedEntity(String name) {
return null;
}
private static final Method saxon85Method = findAllocateDocumentNumberMethod85();
// work-around for incompatibility introduced in saxon-8.5.1
private int allocateDocumentNumber(Configuration config) {
if (saxon85Method == null) {
try { // saxon >= 8.5.1
return allocateDocumentNumber851(config);
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
// saxon < 8.5.1
try {
// return config.getNamePool().allocateDocumentNumber(this);
Object result = saxon85Method.invoke(config.getNamePool(), new Object[] {this});
return ((Integer) result).intValue();
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
// saxon >= 8.5.1
private int allocateDocumentNumber851(Configuration config) {
return config.getDocumentNumberAllocator().allocateDocumentNumber();
}
private static Method findAllocateDocumentNumberMethod85() {
try {
return NamePool.class.getMethod("allocateDocumentNumber", new Class[] {NodeInfo.class});
} catch (Throwable t) {
return null;
}
}
}
//
// The contents of this file are subject to the Mozilla Public License Version
// 1.0 (the "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael Kay
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//