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lightning-sunbird  0.9+nobinonly
nsScriptablePeer.cpp
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00037 
00038 // ==============================
00039 // ! Scriptability related code !
00040 // ==============================
00041 
00043 //
00044 // This file implements the nsScriptablePeer object
00045 // The native methods of this class are supposed to
00046 // be callable from JavaScript
00047 //
00048 #include "plugin.h"
00049 
00050 static NS_DEFINE_IID(kISimplePluginIID, NS_ISIMPLEPLUGIN_IID);
00051 static NS_DEFINE_IID(kIClassInfoIID, NS_ICLASSINFO_IID);
00052 static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
00053 
00054 nsScriptablePeer::nsScriptablePeer(nsPluginInstance* aPlugin)
00055 {
00056   mPlugin = aPlugin;
00057   mRefCnt = 0;
00058 }
00059 
00060 nsScriptablePeer::~nsScriptablePeer()
00061 {
00062 }
00063 
00064 // AddRef, Release and QueryInterface are common methods and must 
00065 // be implemented for any interface
00066 NS_IMETHODIMP_(nsrefcnt) nsScriptablePeer::AddRef() 
00067 { 
00068   ++mRefCnt; 
00069   return mRefCnt; 
00070 } 
00071 
00072 NS_IMETHODIMP_(nsrefcnt) nsScriptablePeer::Release() 
00073 { 
00074   --mRefCnt; 
00075   if (mRefCnt == 0) { 
00076     delete this;
00077     return 0; 
00078   } 
00079   return mRefCnt; 
00080 } 
00081 
00082 // here nsScriptablePeer should return three interfaces it can be asked for by their iid's
00083 // static casts are necessary to ensure that correct pointer is returned
00084 NS_IMETHODIMP nsScriptablePeer::QueryInterface(const nsIID& aIID, void** aInstancePtr) 
00085 { 
00086   if(!aInstancePtr) 
00087     return NS_ERROR_NULL_POINTER; 
00088 
00089   if(aIID.Equals(kISimplePluginIID)) {
00090     *aInstancePtr = NS_STATIC_CAST(nsISimplePlugin*, this); 
00091     AddRef();
00092     return NS_OK;
00093   }
00094 
00095   if(aIID.Equals(kIClassInfoIID)) {
00096     *aInstancePtr = NS_STATIC_CAST(nsIClassInfo*, this); 
00097     AddRef();
00098     return NS_OK;
00099   }
00100 
00101   if(aIID.Equals(kISupportsIID)) {
00102     *aInstancePtr = NS_STATIC_CAST(nsISupports*,(NS_STATIC_CAST(nsISimplePlugin*, this))); 
00103     AddRef();
00104     return NS_OK;
00105   }
00106 
00107   return NS_NOINTERFACE; 
00108 }
00109 
00110 void nsScriptablePeer::SetInstance(nsPluginInstance* plugin)
00111 {
00112   mPlugin = plugin;
00113 }
00114 
00115 //
00116 // the following method will be callable from JavaScript
00117 //
00118 NS_IMETHODIMP nsScriptablePeer::GetVersion(char * *aVersion)
00119 {
00120   if (mPlugin)
00121     mPlugin->getVersion(aVersion);
00122   return NS_OK;
00123 }