From aaa2ad6e885e2b9c16829065d595658fdcc80a7e Mon Sep 17 00:00:00 2001
From: "putterman%netscape.com" <putterman%netscape.com>
Date: Tue, 20 Jul 1999 05:45:42 +0000
Subject: [PATCH] Write ArcLabelsIn so it doesn't crash.

---
 mailnews/base/src/nsMsgFolderDataSource.cpp  |  3 +--
 mailnews/base/src/nsMsgMessageDataSource.cpp |  3 +--
 mailnews/base/src/nsMsgRDFDataSource.cpp     | 19 ++++++++++++++++++-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/mailnews/base/src/nsMsgFolderDataSource.cpp b/mailnews/base/src/nsMsgFolderDataSource.cpp
index d0148d5c826..1cc5fa8fff1 100644
--- a/mailnews/base/src/nsMsgFolderDataSource.cpp
+++ b/mailnews/base/src/nsMsgFolderDataSource.cpp
@@ -349,8 +349,7 @@ NS_IMETHODIMP nsMsgFolderDataSource::HasAssertion(nsIRDFResource* source,
 NS_IMETHODIMP nsMsgFolderDataSource::ArcLabelsIn(nsIRDFNode* node,
                                                  nsISimpleEnumerator** labels)
 {
-  PR_ASSERT(0);
-  return NS_ERROR_NOT_IMPLEMENTED;
+	return nsMsgRDFDataSource::ArcLabelsIn(node, labels);
 }
 
 NS_IMETHODIMP nsMsgFolderDataSource::ArcLabelsOut(nsIRDFResource* source,
diff --git a/mailnews/base/src/nsMsgMessageDataSource.cpp b/mailnews/base/src/nsMsgMessageDataSource.cpp
index 8063d7a2d49..24cb2811af9 100644
--- a/mailnews/base/src/nsMsgMessageDataSource.cpp
+++ b/mailnews/base/src/nsMsgMessageDataSource.cpp
@@ -297,8 +297,7 @@ NS_IMETHODIMP nsMsgMessageDataSource::HasAssertion(nsIRDFResource* source,
 NS_IMETHODIMP nsMsgMessageDataSource::ArcLabelsIn(nsIRDFNode* node,
                                                  nsISimpleEnumerator** labels)
 {
-  PR_ASSERT(0);
-  return NS_ERROR_NOT_IMPLEMENTED;
+	return nsMsgRDFDataSource::ArcLabelsIn(node, labels);
 }
 
 NS_IMETHODIMP nsMsgMessageDataSource::ArcLabelsOut(nsIRDFResource* source,
diff --git a/mailnews/base/src/nsMsgRDFDataSource.cpp b/mailnews/base/src/nsMsgRDFDataSource.cpp
index af8d9c0fa1b..30f42ceb7b6 100644
--- a/mailnews/base/src/nsMsgRDFDataSource.cpp
+++ b/mailnews/base/src/nsMsgRDFDataSource.cpp
@@ -22,6 +22,7 @@
 #include "plstr.h"
 #include "nsXPIDLString.h"
 #include "nsMsgRDFUtils.h"
+#include "nsEnumeratorUtils.h"
 
 static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
 
@@ -197,7 +198,23 @@ nsMsgRDFDataSource::RemoveObserver(nsIRDFObserver *aObserver)
 NS_IMETHODIMP
 nsMsgRDFDataSource::ArcLabelsIn(nsIRDFNode *aNode, nsISimpleEnumerator **_retval)
 {
-    return NS_RDF_NO_VALUE;
+ //return empty enumerator
+  nsCOMPtr<nsISupportsArray> arcs;
+
+  nsresult rv = NS_NewISupportsArray(getter_AddRefs(arcs));
+  if(NS_FAILED(rv))
+	  return rv;
+
+  nsArrayEnumerator* arrayEnumerator =
+    new nsArrayEnumerator(arcs);
+  
+  if (arrayEnumerator == nsnull)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  NS_ADDREF(arrayEnumerator);
+  *_retval = arrayEnumerator;
+
+  return NS_OK;
 }