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-rw-r--r--dom/xul/templates/nsXULTemplateResultSetRDF.cpp82
1 files changed, 82 insertions, 0 deletions
diff --git a/dom/xul/templates/nsXULTemplateResultSetRDF.cpp b/dom/xul/templates/nsXULTemplateResultSetRDF.cpp
new file mode 100644
index 000000000..1ab9a7959
--- /dev/null
+++ b/dom/xul/templates/nsXULTemplateResultSetRDF.cpp
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsXULTemplateResultSetRDF.h"
+#include "nsXULTemplateQueryProcessorRDF.h"
+
+NS_IMPL_ISUPPORTS(nsXULTemplateResultSetRDF, nsISimpleEnumerator)
+
+NS_IMETHODIMP
+nsXULTemplateResultSetRDF::HasMoreElements(bool *aResult)
+{
+ *aResult = true;
+
+ nsCOMPtr<nsIRDFNode> node;
+
+ if (! mInstantiations || ! mQuery) {
+ *aResult = false;
+ return NS_OK;
+ }
+
+ if (mCheckedNext) {
+ if (!mCurrent || mCurrent == &(mInstantiations->mHead))
+ *aResult = false;
+ return NS_OK;
+ }
+
+ mCheckedNext = true;
+
+ do {
+ if (mCurrent) {
+ mCurrent = mCurrent->mNext;
+ if (mCurrent == &(mInstantiations->mHead)) {
+ *aResult = false;
+ return NS_OK;
+ }
+ }
+ else {
+ *aResult = ! mInstantiations->Empty();
+ if (*aResult)
+ mCurrent = mInstantiations->mHead.mNext;
+ }
+
+ // get the value of the member variable. If it is not set, skip
+ // the result and move on to the next result
+ if (mCurrent) {
+ mCurrent->mInstantiation.mAssignments.
+ GetAssignmentFor(mQuery->mMemberVariable, getter_AddRefs(node));
+ }
+
+ // only resources may be used as results
+ mResource = do_QueryInterface(node);
+ } while (! mResource);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULTemplateResultSetRDF::GetNext(nsISupports **aResult)
+{
+ if (!aResult)
+ return NS_ERROR_NULL_POINTER;
+
+ if (!mCurrent || !mCheckedNext)
+ return NS_ERROR_FAILURE;
+
+ RefPtr<nsXULTemplateResultRDF> nextresult =
+ new nsXULTemplateResultRDF(mQuery, mCurrent->mInstantiation, mResource);
+ if (!nextresult)
+ return NS_ERROR_OUT_OF_MEMORY;
+
+ // add the supporting memory elements to the processor's map. These are
+ // used to remove the results when an assertion is removed from the graph
+ mProcessor->AddMemoryElements(mCurrent->mInstantiation, nextresult);
+
+ mCheckedNext = false;
+
+ nextresult.forget(aResult);
+
+ return NS_OK;
+}