From e1308f27fe564d736c9916beac5e34559ea90ece Mon Sep 17 00:00:00 2001
From: "waterson%netscape.com"
 <waterson%netscape.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Tue, 27 Apr 1999 04:17:17 +0000
Subject: [PATCH] Added nsJSUtils::nsConvertJSValtoXPCObject to handle 'in
 xpidl' parameters.

git-svn-id: svn://10.0.0.236/trunk@29380 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/dom/src/base/nsJSUtils.cpp | 36 ++++++++++++++++++++++++++++++
 mozilla/dom/src/base/nsJSUtils.h   |  5 +++++
 2 files changed, 41 insertions(+)

diff --git a/mozilla/dom/src/base/nsJSUtils.cpp b/mozilla/dom/src/base/nsJSUtils.cpp
index bb2a51f5fbd..ad91ba8c3ee 100644
--- a/mozilla/dom/src/base/nsJSUtils.cpp
+++ b/mozilla/dom/src/base/nsJSUtils.cpp
@@ -219,6 +219,42 @@ nsJSUtils::nsConvertJSValToObject(nsISupports** aSupports,
   return JS_TRUE;
 }
 
+NS_EXPORT PRBool
+nsJSUtils::nsConvertJSValToXPCObject(nsISupports** aSupports,
+                                     REFNSIID aIID,
+                                     JSContext* aContext,
+                                     jsval aValue)
+{
+  *aSupports = nsnull;
+  if (JSVAL_IS_NULL(aValue)) {
+    return JS_TRUE;
+  }
+  else if (JSVAL_IS_OBJECT(aValue)) {
+    nsresult rv;
+    NS_WITH_SERVICE(nsIXPConnect, xpc, kXPConnectCID, &rv);
+    if (NS_FAILED(rv)) return JS_FALSE;
+
+    nsIXPConnectWrappedNative* wrapper;
+    rv = xpc->GetWrappedNativeOfJSObject(aContext, JSVAL_TO_OBJECT(aValue), &wrapper);
+    if (NS_FAILED(rv)) return JS_FALSE;
+
+    nsISupports* native;
+    rv = wrapper->GetNative(&native);
+    NS_RELEASE(wrapper);
+    if (NS_FAILED(rv)) return JS_FALSE;
+
+    rv = native->QueryInterface(aIID, (void**) aSupports);
+    NS_RELEASE(native);
+    if (NS_FAILED(rv)) return JS_FALSE;
+
+    return JS_TRUE;
+  }
+  else {
+    return JS_FALSE;
+  }
+}
+
+
 NS_EXPORT void 
 nsJSUtils::nsConvertJSValToString(nsString& aString,
                                   JSContext* aContext,
diff --git a/mozilla/dom/src/base/nsJSUtils.h b/mozilla/dom/src/base/nsJSUtils.h
index 57bc7bef984..adf149d5911 100644
--- a/mozilla/dom/src/base/nsJSUtils.h
+++ b/mozilla/dom/src/base/nsJSUtils.h
@@ -68,6 +68,11 @@ public:
                                        JSContext* aContext,
                                        jsval aValue);
 
+  static NS_EXPORT PRBool nsConvertJSValToXPCObject(nsISupports** aSupports,
+                                                    REFNSIID aIID,
+                                                    JSContext* aContext,
+                                                    jsval aValue);
+
   static NS_EXPORT void nsConvertJSValToString(nsString& aString,
                                      JSContext* aContext,
                                      jsval aValue);