elementnsimpl.java

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    {
        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 XSSimpleTypeDefinition) {
                return ((XSSimpleTypeDecl) type).getTypeName();
            } else {
                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 XSSimpleTypeDefinition) {
                return ((XSSimpleTypeDecl) type).isDOMDerivedFrom(
                        typeNamespaceArg, typeNameArg, derivationMethod);
            } else {
                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;
    }
}