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lightning-sunbird  0.9+nobinonly
nsXPathExpression.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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
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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 TransforMiiX XSLT processor code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Peter Van der Beken <peterv@propagandism.org>
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
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00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsXPathExpression_h__
00040 #define nsXPathExpression_h__
00041 
00042 #include "nsIDOMXPathExpression.h"
00043 #include "nsIDOMNSXPathExpression.h"
00044 #include "txIXPathContext.h"
00045 #include "txResultRecycler.h"
00046 #include "nsAutoPtr.h"
00047 
00048 class Expr;
00049 class txXPathNode;
00050 
00054 class nsXPathExpression : public nsIDOMXPathExpression,
00055                           public nsIDOMNSXPathExpression
00056 {
00057 public:
00058     nsXPathExpression(nsAutoPtr<Expr>& aExpression,
00059                       txResultRecycler* aRecycler);
00060     virtual ~nsXPathExpression();
00061 
00062     // nsISupports interface
00063     NS_DECL_ISUPPORTS
00064 
00065     // nsIDOMXPathExpression interface
00066     NS_DECL_NSIDOMXPATHEXPRESSION
00067 
00068     // nsIDOMNSXPathExpression interface
00069     NS_DECL_NSIDOMNSXPATHEXPRESSION
00070 
00071 private:
00072     nsAutoPtr<Expr> mExpression;
00073     nsRefPtr<txResultRecycler> mRecycler;
00074 
00075     class EvalContextImpl : public txIEvalContext
00076     {
00077     public:
00078         EvalContextImpl(const txXPathNode& aContextNode,
00079                         PRUint32 aContextPosition, PRUint32 aContextSize,
00080                         txResultRecycler* aRecycler)
00081             : mContextNode(aContextNode),
00082               mContextPosition(aContextPosition),
00083               mContextSize(aContextSize),
00084               mLastError(NS_OK),
00085               mRecycler(aRecycler)
00086         {
00087         }
00088 
00089         ~EvalContextImpl()
00090         {
00091         }
00092 
00093         nsresult getError()
00094         {
00095             return mLastError;
00096         }
00097 
00098         TX_DECL_EVAL_CONTEXT;
00099 
00100     private:
00101         const txXPathNode& mContextNode;
00102         PRUint32 mContextPosition;
00103         PRUint32 mContextSize;
00104         nsresult mLastError;
00105         nsRefPtr<txResultRecycler> mRecycler;
00106     };
00107 };
00108 
00109 #endif