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comparison: content/xul/templates/src/nsXULTemplateResultSetRDF.cpp
content/xul/templates/src/nsXULTemplateResultSetRDF.cpp
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsXULTemplateResultSetRDF.h" | |
| 7 #include "nsXULTemplateQueryProcessorRDF.h" | |
| 8 | |
| 9 NS_IMPL_ISUPPORTS(nsXULTemplateResultSetRDF, nsISimpleEnumerator) | |
| 10 | |
| 11 NS_IMETHODIMP | |
| 12 nsXULTemplateResultSetRDF::HasMoreElements(bool *aResult) | |
| 13 { | |
| 14 *aResult = true; | |
| 15 | |
| 16 nsCOMPtr<nsIRDFNode> node; | |
| 17 | |
| 18 if (! mInstantiations || ! mQuery) { | |
| 19 *aResult = false; | |
| 20 return NS_OK; | |
| 21 } | |
| 22 | |
| 23 if (mCheckedNext) { | |
| 24 if (!mCurrent || mCurrent == &(mInstantiations->mHead)) | |
| 25 *aResult = false; | |
| 26 return NS_OK; | |
| 27 } | |
| 28 | |
| 29 mCheckedNext = true; | |
| 30 | |
| 31 do { | |
| 32 if (mCurrent) { | |
| 33 mCurrent = mCurrent->mNext; | |
| 34 if (mCurrent == &(mInstantiations->mHead)) { | |
| 35 *aResult = false; | |
| 36 return NS_OK; | |
| 37 } | |
| 38 } | |
| 39 else { | |
| 40 *aResult = ! mInstantiations->Empty(); | |
| 41 if (*aResult) | |
| 42 mCurrent = mInstantiations->mHead.mNext; | |
| 43 } | |
| 44 | |
| 45 // get the value of the member variable. If it is not set, skip | |
| 46 // the result and move on to the next result | |
| 47 if (mCurrent) { | |
| 48 mCurrent->mInstantiation.mAssignments. | |
| 49 GetAssignmentFor(mQuery->mMemberVariable, getter_AddRefs(node)); | |
| 50 } | |
| 51 | |
| 52 // only resources may be used as results | |
| 53 mResource = do_QueryInterface(node); | |
| 54 } while (! mResource); | |
| 55 | |
| 56 return NS_OK; | |
| 57 } | |
| 58 | |
| 59 NS_IMETHODIMP | |
| 60 nsXULTemplateResultSetRDF::GetNext(nsISupports **aResult) | |
| 61 { | |
| 62 if (!aResult) | |
| 63 return NS_ERROR_NULL_POINTER; | |
| 64 | |
| 65 if (!mCurrent || !mCheckedNext) | |
| 66 return NS_ERROR_FAILURE; | |
| 67 | |
| 68 nsRefPtr<nsXULTemplateResultRDF> nextresult = | |
| 69 new nsXULTemplateResultRDF(mQuery, mCurrent->mInstantiation, mResource); | |
| 70 if (!nextresult) | |
| 71 return NS_ERROR_OUT_OF_MEMORY; | |
| 72 | |
| 73 // add the supporting memory elements to the processor's map. These are | |
| 74 // used to remove the results when an assertion is removed from the graph | |
| 75 mProcessor->AddMemoryElements(mCurrent->mInstantiation, nextresult); | |
| 76 | |
| 77 mCheckedNext = false; | |
| 78 | |
| 79 *aResult = nextresult; | |
| 80 NS_ADDREF(*aResult); | |
| 81 | |
| 82 return NS_OK; | |
| 83 } |
