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33bb32f549
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convert MOZ_OVERRIDE override
convert MOZ_FINAL final
130 lines
3.8 KiB
C++
130 lines
3.8 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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#ifndef nsRDFQuery_h__
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#define nsRDFQuery_h__
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#include "nsAutoPtr.h"
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#include "nsISimpleEnumerator.h"
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#include "nsCycleCollectionParticipant.h"
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#include "mozilla/Attributes.h"
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#define NS_ITEMPLATERDFQUERY_IID \
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{0x8929ff60, 0x1c9c, 0x4d87, \
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{ 0xac, 0x02, 0x09, 0x14, 0x15, 0x3b, 0x48, 0xc4 }}
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/**
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* A compiled query in the RDF query processor. This interface should not be
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* used directly outside of the RDF query processor.
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*/
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class nsITemplateRDFQuery : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITEMPLATERDFQUERY_IID)
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// return the processor the query was created from
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virtual nsXULTemplateQueryProcessorRDF* Processor() = 0; // not addrefed
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// return the member variable for the query
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virtual nsIAtom* GetMemberVariable() = 0; // not addrefed
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// return the <query> node the query was compiled from
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virtual void GetQueryNode(nsIDOMNode** aQueryNode) = 0;
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// remove any results that are cached by the query
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virtual void ClearCachedResults() = 0;
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};
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class nsRDFQuery final : public nsITemplateRDFQuery
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{
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~nsRDFQuery() { Finish(); }
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public:
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explicit nsRDFQuery(nsXULTemplateQueryProcessorRDF* aProcessor)
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: mProcessor(aProcessor),
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mSimple(false),
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mRoot(nullptr),
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mCachedResults(nullptr)
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{ }
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsRDFQuery)
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/**
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* Retrieve the root node in the rule network
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* @return the root node in the rule network
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*/
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TestNode* GetRoot() { return mRoot; }
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void SetRoot(TestNode* aRoot) { mRoot = aRoot; }
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void GetQueryNode(nsIDOMNode** aQueryNode) override
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{
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*aQueryNode = mQueryNode;
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NS_IF_ADDREF(*aQueryNode);
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}
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void SetQueryNode(nsIDOMNode* aQueryNode)
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{
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mQueryNode = aQueryNode;
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}
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// an optimization is used when several queries all use the simple query
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// syntax. Since simple queries can only generate one possible set of
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// results, they only need to be calculated once and reused for every
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// simple query. The results may be cached in the query for this purpose.
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// If successful, this method takes ownership of aInstantiations.
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nsresult SetCachedResults(nsXULTemplateQueryProcessorRDF* aProcessor,
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const InstantiationSet& aInstantiations);
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// grab the cached results, if any, causing the caller to take ownership
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// of them. This also has the effect of setting the cached results in this
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// nsRDFQuery to null.
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void UseCachedResults(nsISimpleEnumerator** aResults);
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// clear the cached results
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void ClearCachedResults() override
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{
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mCachedResults = nullptr;
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}
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nsXULTemplateQueryProcessorRDF* Processor() override { return mProcessor; }
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nsIAtom* GetMemberVariable() override { return mMemberVariable; }
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bool IsSimple() { return mSimple; }
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void SetSimple() { mSimple = true; }
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// the reference and member variables for the query
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nsCOMPtr<nsIAtom> mRefVariable;
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nsCOMPtr<nsIAtom> mMemberVariable;
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protected:
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nsXULTemplateQueryProcessorRDF* mProcessor;
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// true if the query is a simple rule (one with a default query)
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bool mSimple;
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/**
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* The root node in the network for this query
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*/
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TestNode *mRoot;
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// the <query> node
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nsCOMPtr<nsIDOMNode> mQueryNode;
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// used for simple rules since their results are all determined in one step
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nsCOMPtr<nsISimpleEnumerator> mCachedResults;
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void Finish();
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsITemplateRDFQuery, NS_ITEMPLATERDFQUERY_IID)
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#endif // nsRDFQuery_h__
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