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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (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.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.xerces.internal.dom;

	import com.sun.org.apache.xerces.internal.xs.XSSimpleTypeDefinition;
	import com.sun.org.apache.xerces.internal.xs.XSTypeDefinition;
	import com.sun.org.apache.xerces.internal.impl.dv.xs.XSSimpleTypeDecl;
	import com.sun.org.apache.xerces.internal.impl.xs.XSComplexTypeDecl;
	import com.sun.org.apache.xerces.internal.util.URI;
	import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
	import org.w3c.dom.Attr;
	import org.w3c.dom.DOMException;



	/**
	* ElementNSImpl inherits from ElementImpl and adds namespace support.
	* <P>
	* The qualified name is the node name, and we store localName which is also
	* used in all queries. On the other hand we recompute the prefix when
	* necessary.
	*
	* @xerces.internal
	*
	* @author Elena litani, IBM
	* @author Neeraj Bajaj, Sun Microsystems
	*/
	public class ElementNSImpl
	extends ElementImpl {

	//
	// Constants
	//

	/** Serialization version. */
	static final long serialVersionUID = -9142310625494392642L;
	static final String xmlURI = "http://www.w3.org/XML/1998/namespace";

	//
	// Data
	//

	/** DOM2: Namespace URI. */
	protected String namespaceURI;

	/** DOM2: localName. */
	protected String localName;

	/** DOM3: type information */
	// REVISIT: we are losing the type information in DOM during serialization
	transient XSTypeDefinition type;

	protected ElementNSImpl() {
	super();
	}
	/**
	* DOM2: Constructor for Namespace implementation.
	*/
	protected ElementNSImpl(CoreDocumentImpl ownerDocument,
	String namespaceURI,
	String qualifiedName)
	throws DOMException
	{
	super(ownerDocument, qualifiedName);
	setName(namespaceURI, qualifiedName);
	}

	private void setName(String namespaceURI, String qname) {

	String prefix;
	// DOM Level 3: namespace URI is never empty string.
	this.namespaceURI = namespaceURI;
	if (namespaceURI != null) {
	//convert the empty string to 'null'
	this.namespaceURI = (namespaceURI.length() == 0) ? null : namespaceURI;
	}

	int colon1, colon2 ;

	//NAMESPACE_ERR:
	//1. if the qualified name is 'null' it is malformed.
	//2. or if the qualifiedName is null and the namespaceURI is different from null,
	// We dont need to check for namespaceURI != null, if qualified name is null throw DOMException.
	if(qname == null){
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"NAMESPACE_ERR",
	null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	}
	else{
	colon1 = qname.indexOf(':');
	colon2 = qname.lastIndexOf(':');
	}

	ownerDocument.checkNamespaceWF(qname, colon1, colon2);
	if (colon1 < 0) {
	// there is no prefix
	localName = qname;
	if (ownerDocument.errorChecking) {
	ownerDocument.checkQName(null, localName);
	if (qname.equals("xmlns")
	&& (namespaceURI == null
	\|\| !namespaceURI.equals(NamespaceContext.XMLNS_URI))
	\|\| (namespaceURI!=null && namespaceURI.equals(NamespaceContext.XMLNS_URI)
	&& !qname.equals("xmlns"))) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"NAMESPACE_ERR",
	null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	}
	}
	}//there is a prefix
	else {
	prefix = qname.substring(0, colon1);
	localName = qname.substring(colon2 + 1);

	//NAMESPACE_ERR:
	//1. if the qualifiedName has a prefix and the namespaceURI is null,

	//2. or if the qualifiedName has a prefix that is "xml" and the namespaceURI
	//is different from " http://www.w3.org/XML/1998/namespace"

	if (ownerDocument.errorChecking) {
	if( namespaceURI == null \|\| ( prefix.equals("xml") && !namespaceURI.equals(NamespaceContext.XML_URI) )){
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"NAMESPACE_ERR",
	null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	}

	ownerDocument.checkQName(prefix, localName);
	ownerDocument.checkDOMNSErr(prefix, namespaceURI);
	}
	}
	}

	// when local name is known
	protected ElementNSImpl(CoreDocumentImpl ownerDocument,
	String namespaceURI, String qualifiedName,
	String localName)
	throws DOMException
	{
	super(ownerDocument, qualifiedName);

	this.localName = localName;
	this.namespaceURI = namespaceURI;
	}

	// for DeferredElementImpl
	protected ElementNSImpl(CoreDocumentImpl ownerDocument,
	String value) {
	super(ownerDocument, value);
	}

	// Support for DOM Level 3 renameNode method.
	// Note: This only deals with part of the pb. CoreDocumentImpl
	// does all the work.
	void rename(String namespaceURI, String qualifiedName)
	{
	if (needsSyncData()) {
	synchronizeData();
	}
	this.name = qualifiedName;
	setName(namespaceURI, qualifiedName);
	reconcileDefaultAttributes();
	}

	/**
	* NON-DOM: resets this node and sets specified values for the node
	*
	* @param ownerDocument
	* @param namespaceURI
	* @param qualifiedName
	* @param localName
	*/
	protected void setValues (CoreDocumentImpl ownerDocument,
	String namespaceURI, String qualifiedName,
	String localName){

	// remove children first
	firstChild = null;
	previousSibling = null;
	nextSibling = null;
	fNodeListCache = null;

	// set owner document
	attributes = null;
	super.flags = 0;
	setOwnerDocument(ownerDocument);

	// synchronizeData will initialize attributes
	needsSyncData(true);
	super.name = qualifiedName;
	this.localName = localName;
	this.namespaceURI = namespaceURI;

	}

	//
	// Node methods
	//



	//
	//DOM2: Namespace methods.
	//

	/**
	* Introduced in DOM Level 2. <p>
	*
	* The namespace URI of this node, or null if it is unspecified.<p>
	*
	* This is not a computed value that is the result of a namespace lookup based on
	* an examination of the namespace declarations in scope. It is merely the
	* namespace URI given at creation time.<p>
	*
	* For nodes created with a DOM Level 1 method, such as createElement
	* from the Document interface, this is null.
	* @since WD-DOM-Level-2-19990923
	*/
	public String getNamespaceURI()
	{
	if (needsSyncData()) {
	synchronizeData();
	}
	return namespaceURI;
	}

	/**
	* Introduced in DOM Level 2. <p>
	*
	* The namespace prefix of this node, or null if it is unspecified. <p>
	*
	* For nodes created with a DOM Level 1 method, such as createElement
	* from the Document interface, this is null. <p>
	*
	* @since WD-DOM-Level-2-19990923
	*/
	public String getPrefix()
	{

	if (needsSyncData()) {
	synchronizeData();
	}
	int index = name.indexOf(':');
	return index < 0 ? null : name.substring(0, index);
	}

	/**
	* Introduced in DOM Level 2. <p>
	*
	* Note that setting this attribute changes the nodeName attribute, which holds the
	* qualified name, as well as the tagName and name attributes of the Element
	* and Attr interfaces, when applicable.<p>
	*
	* @param prefix The namespace prefix of this node, or null(empty string) if it is unspecified.
	*
	* @exception INVALID_CHARACTER_ERR
	* Raised if the specified
	* prefix contains an invalid character.
	* @exception DOMException
	* @since WD-DOM-Level-2-19990923
	*/
	public void setPrefix(String prefix)
	throws DOMException
	{
	if (needsSyncData()) {
	synchronizeData();
	}
	if (ownerDocument.errorChecking) {
	if (isReadOnly()) {
	String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
	throw new DOMException(
	DOMException.NO_MODIFICATION_ALLOWED_ERR,
	msg);
	}
	if (prefix != null && prefix.length() != 0) {
	if (!CoreDocumentImpl.isXMLName(prefix,ownerDocument.isXML11Version())) {
	String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "INVALID_CHARACTER_ERR", null);
	throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
	}
	if (namespaceURI == null \|\| prefix.indexOf(':') >=0) {
	String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NAMESPACE_ERR", null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	} else if (prefix.equals("xml")) {
	if (!namespaceURI.equals(xmlURI)) {
	String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NAMESPACE_ERR", null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	}
	}
	}

	}
	// update node name with new qualifiedName
	if (prefix !=null && prefix.length() != 0) {
	name = prefix + ":" + localName;
	}
	else {
	name = localName;
	}
	}

	/**
	* Introduced in DOM Level 2. <p>
	*
	* Returns the local part of the qualified name of this node.
	* @since WD-DOM-Level-2-19990923
	*/
	public String getLocalName()
	{
	if (needsSyncData()) {
	synchronizeData();
	}
	return localName;
	}


	/**
	* DOM Level 3 WD - Experimental.
	* Retrieve baseURI
	*/
	public String getBaseURI() {

	if (needsSyncData()) {
	synchronizeData();
	}
	// Absolute base URI is computed according to XML Base (http://www.w3.org/TR/xmlbase/#granularity)

	// 1. the base URI specified by an xml:base attribute on the element, if one exists

	if (attributes != null) {
	Attr attrNode = (Attr)attributes.getNamedItemNS("http://www.w3.org/XML/1998/namespace", "base");
	if (attrNode != null) {
	String uri = attrNode.getNodeValue();
	if (uri.length() != 0 ) {// attribute value is always empty string
	try {
	uri = new URI(uri).toString();
	}
	catch (com.sun.org.apache.xerces.internal.util.URI.MalformedURIException e) {
	// This may be a relative URI.

	// Start from the base URI of the parent, or if this node has no parent, the owner node.
	NodeImpl parentOrOwner = (parentNode() != null) ? parentNode() : ownerNode;

	// Make any parentURI into a URI object to use with the URI(URI, String) constructor.
	String parentBaseURI = (parentOrOwner != null) ? parentOrOwner.getBaseURI() : null;

	if (parentBaseURI != null) {
	try {
	uri = new URI(new URI(parentBaseURI), uri).toString();
	}
	catch (com.sun.org.apache.xerces.internal.util.URI.MalformedURIException ex){
	// This should never happen: parent should have checked the URI and returned null if invalid.
	return null;
	}
	return uri;
	}
	// REVISIT: what should happen in this case?
	return null;
	}
	return uri;
	}
	}
	}

	//2.the base URI of the element's parent element within the document or external entity,
	//if one exists
	String parentElementBaseURI = (this.parentNode() != null) ? this.parentNode().getBaseURI() : null ;
	//base URI of parent element is not null
	if(parentElementBaseURI != null){
	try {
	//return valid absolute base URI
	return new URI(parentElementBaseURI).toString();
	}
	catch (com.sun.org.apache.xerces.internal.util.URI.MalformedURIException e){
	// REVISIT: what should happen in this case?
	return null;
	}
	}
	//3. the base URI of the document entity or external entity containing the element

	String baseURI = (this.ownerNode != null) ? this.ownerNode.getBaseURI() : null ;

	if(baseURI != null){
	try {
	//return valid absolute base URI
	return new URI(baseURI).toString();
	}
	catch (com.sun.org.apache.xerces.internal.util.URI.MalformedURIException e){
	// REVISIT: what should happen in this case?
	return null;
	}
	}

	return null;

	}


	/**
	* @see org.w3c.dom.TypeInfo#getTypeName()
	*/
	public String getTypeName() {
	if (type !=null){
	if (type instanceof XSSimpleTypeDecl) {
	return ((XSSimpleTypeDecl) type).getTypeName();
	} else if (type instanceof XSComplexTypeDecl) {
	return ((XSComplexTypeDecl) type).getTypeName();
	}
	}
	return null;
	}

	/**
	* @see org.w3c.dom.TypeInfo#getTypeNamespace()
	*/
	public String getTypeNamespace() {
	if (type !=null){
	return type.getNamespace();
	}
	return null;
	}

	/**
	* Introduced in DOM Level 2. <p>
	* Checks if a type is derived from another by restriction. See:
	* http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-isDerivedFrom
	*
	* @param ancestorNS
	* The namspace of the ancestor type declaration
	* @param ancestorName
	* The name of the ancestor type declaration
	* @param type
	* The reference type definition
	*
	* @return boolean True if the type is derived by restriciton for the
	* reference type
	*/
	public boolean isDerivedFrom(String typeNamespaceArg, String typeNameArg,
	int derivationMethod) {
	if(needsSyncData()) {
	synchronizeData();
	}
	if (type != null) {
	if (type instanceof XSSimpleTypeDecl) {
	return ((XSSimpleTypeDecl) type).isDOMDerivedFrom(
	typeNamespaceArg, typeNameArg, derivationMethod);
	} else if (type instanceof XSComplexTypeDecl) {
	return ((XSComplexTypeDecl) type).isDOMDerivedFrom(
	typeNamespaceArg, typeNameArg, derivationMethod);
	}
	}
	return false;
	}

	/**
	* NON-DOM: setting type used by the DOM parser
	* @see NodeImpl#setReadOnly
	*/
	public void setType(XSTypeDefinition type) {
	this.type = type;
	}
	}

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