LCOV - code coverage report
Current view: directory - objdir/dist/include - nsDOMScriptObjectHolder.h (source / functions) Found Hit Coverage
Test: app.info Lines: 30 0 0.0 %
Date: 2012-06-02 Functions: 9 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2005
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *      Mark Hammond <mhammond@skippinet.com.au>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      27                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : #ifndef nsDOMScriptObjectHolder_h__
      40                 : #define nsDOMScriptObjectHolder_h__
      41                 : 
      42                 : #include "nsIScriptContext.h"
      43                 : #include "nsIDOMScriptObjectFactory.h"
      44                 : 
      45                 : #include "jspubtd.h"
      46                 : 
      47                 : // A thin class used to help with script object memory management.  No virtual
      48                 : // functions and a fully inline implementation should keep the cost down.
      49                 : // [Note that a fully inline implementation is necessary for use by other
      50                 : // languages, which do not link against the layout component module]
      51                 : template<class T>
      52                 : class NS_STACK_CLASS nsScriptObjectHolder {
      53                 : public:
      54                 :   // A constructor that will cause a reference to |ctx| to be stored in
      55                 :   // the object.  Only use for short-lived object holders.
      56               0 :   nsScriptObjectHolder<T>(nsIScriptContext *ctx, T* aObject = nsnull) :
      57               0 :       mObject(aObject), mContext(ctx) {
      58               0 :     NS_ASSERTION(ctx, "Must provide a valid context");
      59               0 :   }
      60                 : 
      61                 :   // copy constructor
      62                 :   nsScriptObjectHolder<T>(const nsScriptObjectHolder<T>& other) :
      63                 :       mObject(other.mObject),
      64                 :       mContext(other.mContext)
      65                 :   {
      66                 :     // New hold the script object and new reference on the script context.
      67                 :     if (mObject)
      68                 :       mContext->HoldScriptObject(mObject);
      69                 :   }
      70                 : 
      71               0 :   ~nsScriptObjectHolder<T>() {
      72               0 :     if (mObject)
      73               0 :       mContext->DropScriptObject(mObject);
      74               0 :   }
      75                 : 
      76                 :   // misc operators
      77                 :   nsScriptObjectHolder<T> &operator=(const nsScriptObjectHolder<T> &other) {
      78                 :     set(other);
      79                 :     return *this;
      80                 :   }
      81                 :   bool operator!() const {
      82                 :     return !mObject;
      83                 :   }
      84               0 :   operator bool() const {
      85               0 :     return !!mObject;
      86                 :   }
      87               0 :   T* get() const {
      88               0 :     return mObject;
      89                 :   }
      90                 : 
      91                 :   // Drop the script object - but *not* the nsIScriptContext.
      92               0 :   nsresult drop() {
      93               0 :     nsresult rv = NS_OK;
      94               0 :     if (mObject) {
      95               0 :       rv = mContext->DropScriptObject(mObject);
      96               0 :       mObject = nsnull;
      97                 :     }
      98               0 :     return rv;
      99                 :   }
     100                 : 
     101               0 :   nsresult set(T* object) {
     102               0 :     NS_ASSERTION(getScriptTypeID() != nsIProgrammingLanguage::UNKNOWN,
     103                 :                  "Must know the language!");
     104               0 :     nsresult rv = drop();
     105               0 :     if (NS_FAILED(rv))
     106               0 :       return rv;
     107               0 :     if (object) {
     108               0 :       rv = mContext->HoldScriptObject(object);
     109                 :       // don't store the pointer if we failed to lock it.
     110               0 :       if (NS_SUCCEEDED(rv)) {
     111               0 :         mObject = object;
     112                 :       }
     113                 :     }
     114               0 :     return rv;
     115                 :   }
     116                 :   nsresult set(const nsScriptObjectHolder<T> &other) {
     117                 :     NS_ASSERTION(getScriptTypeID() == other.getScriptTypeID(),
     118                 :                  "Must have identical languages!");
     119                 :     nsresult rv = drop();
     120                 :     if (NS_FAILED(rv))
     121                 :       return rv;
     122                 :     return set(other.mObject);
     123                 :   }
     124                 :   // Get the language ID.
     125               0 :   PRUint32 getScriptTypeID() const {
     126               0 :     return mContext->GetScriptTypeID();
     127                 :   }
     128                 : protected:
     129                 :   T* mObject;
     130                 :   nsCOMPtr<nsIScriptContext> mContext;
     131                 : };
     132                 : 
     133                 : #endif // nsDOMScriptObjectHolder_h__

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