elementimpl.java

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     * Attribute has a default value, it is immediately replaced thereby.
     * <P>
     * The default logic is actually implemented in NamedNodeMapImpl.
     * PR-DOM-Level-1-19980818 doesn't fully address the DTD, so some
     * of this behavior is likely to change in future versions. ?????
     * <P>
     * Note that this call "succeeds" even if no attribute by this name
     * existed -- unlike removeAttributeNode, which will throw a not-found
     * exception in that case.
     *
     * @throws DOMException(NO_MODIFICATION_ALLOWED_ERR) if the node is
     * readonly.
     */
    public void removeAttribute(String name) {

    	if (ownerDocument.errorChecking && isReadOnly()) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
            throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
        }

        if (needsSyncData()) {
            synchronizeData();
        }

        if (attributes == null) {
            return;
        }

        attributes.safeRemoveNamedItem(name);

    } // removeAttribute(String)


    /**
     * Remove the specified attribute/value pair. If the removed
     * Attribute has a default value, it is immediately replaced.
     * <p>
     * NOTE: Specifically removes THIS NODE -- not the node with this
     * name, nor the node with these contents. If the specific Attribute
     * object passed in is not stored in this Element, we throw a
     * DOMException.  If you really want to remove an attribute by name,
     * use removeAttribute().
     *
     * @return the Attribute object that was removed.
     * @throws DOMException(NOT_FOUND_ERR) if oldattr is not an attribute of
     * this Element.
     * @throws DOMException(NO_MODIFICATION_ALLOWED_ERR) if the node is
     * readonly.
     */
    public Attr removeAttributeNode(Attr oldAttr)
        throws DOMException {

    	if (ownerDocument.errorChecking && isReadOnly()) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
            throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
        }

        if (needsSyncData()) {
            synchronizeData();
        }

        if (attributes == null) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_FOUND_ERR", null);
            throw new DOMException(DOMException.NOT_FOUND_ERR, msg);
        }
        return (Attr) attributes.removeItem(oldAttr, true);

    } // removeAttributeNode(Attr):Attr


    /**
     * Add a new name/value pair, or replace the value of the existing
     * attribute having that name.
     *
     * Note: this method supports only the simplest kind of Attribute,
     * one whose value is a string contained in a single Text node.
     * If you want to assert a more complex value (which XML permits,
     * though HTML doesn't), see setAttributeNode().
     *
     * The attribute is created with specified=true, meaning it's an
     * explicit value rather than inherited from the DTD as a default.
     * Again, setAttributeNode can be used to achieve other results.
     *
     * @throws DOMException(INVALID_NAME_ERR) if the name is not acceptable.
     * (Attribute factory will do that test for us.)
     *
     * @throws DOMException(NO_MODIFICATION_ALLOWED_ERR) if the node is
     * readonly.
     */
	public void setAttribute(String name, String value) {

		if (ownerDocument.errorChecking && isReadOnly()) {
			String msg =
				DOMMessageFormatter.formatMessage(
					DOMMessageFormatter.DOM_DOMAIN,
					"NO_MODIFICATION_ALLOWED_ERR",
					null);
			throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
		}

		if (needsSyncData()) {
			synchronizeData();
		}

		Attr newAttr = getAttributeNode(name);
		if (newAttr == null) {
			newAttr = getOwnerDocument().createAttribute(name);

			if (attributes == null) {
				attributes = new AttributeMap(this, null);
			}

			newAttr.setNodeValue(value);
			attributes.setNamedItem(newAttr);
		}
		else {
			newAttr.setNodeValue(value);
		}

	} // setAttribute(String,String)

    /**
     * Add a new attribute/value pair, or replace the value of the
     * existing attribute with that name.
     * <P>
     * This method allows you to add an Attribute that has already been
     * constructed, and hence avoids the limitations of the simple
     * setAttribute() call. It can handle attribute values that have
     * arbitrarily complex tree structure -- in particular, those which
     * had entity references mixed into their text.
     *
     * @throws DOMException(INUSE_ATTRIBUTE_ERR) if the Attribute object
     * has already been assigned to another Element.
     */
    public Attr setAttributeNode(Attr newAttr)
        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 (newAttr.getOwnerDocument() != ownerDocument) {
                String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null);
    		    throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, msg);
            }
        }

        if (attributes == null) {
            attributes = new AttributeMap(this, null);
        }
    	// This will throw INUSE if necessary
    	return (Attr) attributes.setNamedItem(newAttr);

    } // setAttributeNode(Attr):Attr

    //
    // DOM2: Namespace methods
    //

    /**
     * Introduced in DOM Level 2. <p>
     *
     * Retrieves an attribute value by local name and namespace URI.
     *
     * @param namespaceURI
     *                      The namespace URI of the attribute to
     *                      retrieve.
     * @param localName     The local name of the attribute to retrieve.
     * @return String       The Attr value as a string, or empty string
     *                      if that attribute
     *                      does not have a specified or default value.
     * @since WD-DOM-Level-2-19990923
     */
    public String getAttributeNS(String namespaceURI, String localName) {

        if (needsSyncData()) {
            synchronizeData();
        }

        if (attributes == null) {
            return "";
        }

        Attr attr = (Attr)(attributes.getNamedItemNS(namespaceURI, localName));
        return (attr == null) ? "" : attr.getValue();

    } // getAttributeNS(String,String):String

    /**
     * Introduced in DOM Level 2. <p>
     *
     *  Adds a new attribute.
     *  If the given namespaceURI is null or an empty string and the
     *  qualifiedName has a prefix that is "xml", the new attribute is bound to
     *  the predefined namespace "http://www.w3.org/XML/1998/namespace"
     *  [Namespaces].  If an attribute with the same local name and namespace
     *  URI is already present on the element, its prefix is changed to be the
     *  prefix part of the qualifiedName, and its value is changed to be the
     *  value parameter. This value is a simple string, it is not parsed as it
     *  is being set. So any markup (such as syntax to be recognized as an
     *  entity reference) is treated as literal text, and needs to be
     *  appropriately escaped by the implementation when it is written out. In
     *  order to assign an attribute value that contains entity references, the
     *  user must create an Attr node plus any Text and EntityReference nodes,
     *  build the appropriate subtree, and use setAttributeNodeNS or
     *  setAttributeNode to assign it as the value of an attribute.
     *
     * @param namespaceURI      The namespace URI of the attribute to create
     *                          or alter.
     * @param qualifiedName     The qualified name of the attribute to create or
     *                          alter.
     * @param value             The value to set in string form.
     * @throws                  INVALID_CHARACTER_ERR: Raised if the specified
     *                          name contains an invalid character.
     *
     * @throws                  NO_MODIFICATION_ALLOWED_ERR: Raised if this
     *                          node is readonly.
     *
     * @throws                  NAMESPACE_ERR: Raised if the qualifiedName
     *                          has a prefix that is "xml" and the namespaceURI
     *                          is neither null nor an empty string nor
     *                          "http://www.w3.org/XML/1998/namespace", or if
     *                          the qualifiedName has a prefix that is "xmlns"
     *                          but the namespaceURI is neither null nor an
     *                          empty string, or if if the qualifiedName has a
     *                          prefix different from "xml" and "xmlns" and the
     *                          namespaceURI is null or an empty string.
     * @since WD-DOM-Level-2-19990923
     */
     public void setAttributeNS(String namespaceURI,String qualifiedName,
		                          String value) {
		if (ownerDocument.errorChecking && isReadOnly()) {
			String msg =
				DOMMessageFormatter.formatMessage(
					DOMMessageFormatter.DOM_DOMAIN,
					"NO_MODIFICATION_ALLOWED_ERR",
					null);
			throw new DOMException(
				DOMException.NO_MODIFICATION_ALLOWED_ERR,
				msg);
		}
		if (needsSyncData()) {
			synchronizeData();
		}
		int index = qualifiedName.indexOf(':');
		String prefix, localName;
		if (index < 0) {
			prefix = null;
			localName = qualifiedName;
		}
		else {
			prefix = qualifiedName.substring(0, index);
			localName = qualifiedName.substring(index + 1);
		}
		Attr newAttr = getAttributeNodeNS(namespaceURI, localName);
		if (newAttr == null) {
            // REVISIT: this is not efficient, we are creating twice the same
            //          strings for prefix and localName.
			newAttr = getOwnerDocument().createAttributeNS(
					namespaceURI,
					qualifiedName);
			if (attributes == null) {
				attributes = new AttributeMap(this, null);
			}
			newAttr.setNodeValue(value);
			attributes.setNamedItemNS(newAttr);
		}
		else {
            if (newAttr instanceof AttrNSImpl){
                // change prefix and value
                ((AttrNSImpl)newAttr).name= (prefix!=null)?(prefix+":"+localName):localName;
            }
            else {
                // This case may happen if user calls:
                //      elem.setAttribute("name", "value");
                //      elem.setAttributeNS(null, "name", "value");
                // This case is not defined by the DOM spec, we choose
                // to create a new attribute in this case and remove an old one from the tree
                // note this might cause events to be propagated or user data to be lost 
                newAttr = new AttrNSImpl((CoreDocumentImpl)getOwnerDocument(), namespaceURI, qualifiedName, localName);
                attributes.setNamedItemNS(newAttr);
            }

			newAttr.setNodeValue(value);
		}

    } // setAttributeNS(String,String,String)


    /**
     * Introduced in DOM Level 2. <p>
     *
     * Removes an attribute by local name and namespace URI. If the removed
     * attribute has a default value it is immediately replaced.
     * The replacing attribute has the same namespace URI and local name,
     * as well as the original prefix.<p>
     *
     * @param namespaceURI  The namespace URI of the attribute to remove.
     *
     * @param localName     The local name of the attribute to remove.
     * @throws                  NO_MODIFICATION_ALLOWED_ERR: Raised if this
     *                          node is readonly.
     * @since WD-DOM-Level-2-19990923
     */
    public void removeAttributeNS(String namespaceURI, String localName) {

    	if (ownerDocument.errorChecking && isReadOnly()) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
            throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
        }

        if (needsSyncData()) {
            synchronizeData();
        }

        if (attributes == null) {
            return;
        }

        attributes.safeRemoveNamedItemNS(namespaceURI, localName);

    } // removeAttributeNS(String,String)

    /**
     * Retrieves an Attr node by local name and namespace URI.
     *
     * @param namespaceURI  The namespace URI of the attribute to
     *                      retrieve.
     * @param localName     The local name of the attribute to retrieve.
     * @return Attr         The Attr node with the specified attribute
     *                      local name and namespace
     *                      URI or null if there is no such attribute.
     * @since WD-DOM-Level-2-19990923
     */
    public Attr getAttributeNodeNS(String namespaceURI, String localName){

        if (needsSyncData()) {
            synchronizeData();
        }
        if (attributes == null) {
            return null;
        }
        return (Attr)attributes.getNamedItemNS(namespaceURI, localName);

    } // getAttributeNodeNS(String,String):Attr

    /**
     * Introduced in DOM Level 2. <p>
     *
     * Adds a new attribute. If an attribute with that local name and
     * namespace URI is already present in the element, it is replaced
     * by the new one.
     *
     * @param Attr      The Attr node to add to the attribute list. When
     *                  the Node has no namespaceURI, this method behaves
     *                  like setAttributeNode.
     * @return Attr     If the newAttr attribute replaces an existing attribute
     *                  with the same local name and namespace URI, the *
     *                  previously existing Attr node is returned, otherwise
     *                  null is returned.
     * @throws          WRONG_DOCUMENT_ERR: Raised if newAttr
     *                  was created from a different document than the one that
     *                  created the element.
     *
     * @throws          NO_MODIFICATION_ALLOWED_ERR: Raised if
     *                  this node is readonly.
     *
     * @throws          INUSE_ATTRIBUTE_ERR: Raised if newAttr is
     *                  already an attribute of another Element object. The
     *                  DOM user must explicitly clone Attr nodes to re-use
     *                  them in other elements.
     * @since WD-DOM-Level-2-19990923
     */
    public Attr setAttributeNodeNS(Attr newAttr)
        throws DOMException
        {

        if (needsSyncData()) {
            synchronizeData();