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