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lightning-sunbird  0.9+nobinonly
nsXFormsValueElement.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla XForms support.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * IBM Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2004
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *  Brian Ryner <bryner@brianryner.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either the GNU General Public License Version 2 or later (the "GPL"), or
00027  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsIXFormsValueElement.h"
00040 #include "nsXFormsStubElement.h"
00041 #include "nsIXTFGenericElementWrapper.h"
00042 #include "nsIDOM3Node.h"
00043 #include "nsXFormsUtils.h"
00044 #include "nsIDOMElement.h"
00045 #include "nsString.h"
00046 
00054 class nsXFormsValueElement : public nsXFormsStubElement,
00055                              public nsIXFormsValueElement
00056 {
00057 public:
00058   nsXFormsValueElement() : mElement(nsnull) {}
00059 
00060   NS_DECL_ISUPPORTS_INHERITED
00061 
00062   // nsIXTFGenericElement overrides
00063   NS_IMETHOD OnCreated(nsIXTFGenericElementWrapper *aWrapper);
00064 
00065   // nsIXFormsValueElement
00066   NS_DECL_NSIXFORMSVALUEELEMENT
00067 
00068 private:
00069   nsIDOMElement *mElement;
00070 };
00071 
00072 NS_IMPL_ISUPPORTS_INHERITED1(nsXFormsValueElement,
00073                              nsXFormsStubElement,
00074                              nsIXFormsValueElement)
00075 
00076 NS_IMETHODIMP
00077 nsXFormsValueElement::OnCreated(nsIXTFGenericElementWrapper *aWrapper)
00078 {
00079   nsCOMPtr<nsIDOMElement> node;
00080   aWrapper->GetElementNode(getter_AddRefs(node));
00081 
00082   // It's ok to keep pointer to mElement.  mElement will have an
00083   // owning reference to this object, so as long as we null out mElement in
00084   // OnDestroyed, it will always be valid.
00085 
00086   mElement = node;
00087   NS_ASSERTION(mElement, "Wrapper is not an nsIDOMElement, we'll crash soon");
00088 
00089   return NS_OK;
00090 }
00091 
00092 // nsIXFormsValueElement
00093 
00094 NS_IMETHODIMP
00095 nsXFormsValueElement::GetValue(nsAString &aValue)
00096 {
00097   nsString value;
00098   PRBool singleNodeVal =
00099     nsXFormsUtils::GetSingleNodeBindingValue(mElement, value);
00100   if (singleNodeVal) {
00101     aValue.Assign(value);
00102     return NS_OK;
00103   }
00104 
00105   nsCOMPtr<nsIDOM3Node> node3 = do_QueryInterface(mElement);
00106   NS_ASSERTION(node3, "dom elements must support dom3");
00107 
00108   return node3->GetTextContent(aValue);
00109 }
00110 
00111 NS_HIDDEN_(nsresult)
00112 NS_NewXFormsValueElement(nsIXTFElement **aResult)
00113 {
00114   *aResult = new nsXFormsValueElement();
00115   if (!*aResult)
00116     return NS_ERROR_OUT_OF_MEMORY;
00117 
00118   NS_ADDREF(*aResult);
00119   return NS_OK;
00120 }