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140 lines
5.1 KiB
C++
140 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Waterson <waterson@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsRDFConInstanceTestNode_h__
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#define nsRDFConInstanceTestNode_h__
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#include "nscore.h"
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#include "nsFixedSizeAllocator.h"
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#include "nsRDFTestNode.h"
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#include "nsIRDFResource.h"
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#include "nsIRDFDataSource.h"
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#include "nsXULTemplateQueryProcessorRDF.h"
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/**
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* Rule network node that tests if a resource is an RDF container, or
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* uses multi-attributes to ``contain'' other elements.
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*/
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class nsRDFConInstanceTestNode : public nsRDFTestNode
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{
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public:
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enum Test { eFalse, eTrue, eDontCare };
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nsRDFConInstanceTestNode(TestNode* aParent,
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nsXULTemplateQueryProcessorRDF* aProcessor,
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nsIAtom* aContainerVariable,
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Test aContainer,
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Test aEmpty);
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virtual nsresult FilterInstantiations(InstantiationSet& aInstantiations,
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PRBool* aCantHandleYet) const;
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virtual PRBool
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CanPropagate(nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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Instantiation& aInitialBindings) const;
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virtual void
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Retract(nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget) const;
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class Element : public MemoryElement {
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protected:
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// Hide so that only Create() and Destroy() can be used to
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// allocate and deallocate from the heap
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static void* operator new(size_t) CPP_THROW_NEW { return 0; }
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static void operator delete(void*, size_t) {}
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public:
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Element(nsIRDFResource* aContainer,
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Test aContainerTest,
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Test aEmptyTest)
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: mContainer(aContainer),
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mContainerTest(aContainerTest),
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mEmptyTest(aEmptyTest) {
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MOZ_COUNT_CTOR(nsRDFConInstanceTestNode::Element); }
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virtual ~Element() { MOZ_COUNT_DTOR(nsRDFConInstanceTestNode::Element); }
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static Element*
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Create(nsIRDFResource* aContainer,
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Test aContainerTest, Test aEmptyTest) {
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void* place = MemoryElement::gPool.Alloc(sizeof(Element));
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return place ? ::new (place) Element(aContainer, aContainerTest, aEmptyTest) : nsnull; }
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void Destroy() {
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this->~Element();
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MemoryElement::gPool.Free(this, sizeof(Element));
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}
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virtual const char* Type() const {
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return "nsRDFConInstanceTestNode::Element"; }
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virtual PLHashNumber Hash() const {
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return (PLHashNumber(NS_PTR_TO_INT32(mContainer.get())) >> 4) ^
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PLHashNumber(mContainerTest) ^
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(PLHashNumber(mEmptyTest) << 4); }
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virtual PRBool Equals(const MemoryElement& aElement) const {
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if (aElement.Type() == Type()) {
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const Element& element = static_cast<const Element&>(aElement);
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return mContainer == element.mContainer
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&& mContainerTest == element.mContainerTest
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&& mEmptyTest == element.mEmptyTest;
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}
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return PR_FALSE; }
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protected:
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nsCOMPtr<nsIRDFResource> mContainer;
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Test mContainerTest;
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Test mEmptyTest;
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};
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protected:
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nsXULTemplateQueryProcessorRDF* mProcessor;
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nsCOMPtr<nsIAtom> mContainerVariable;
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Test mContainer;
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Test mEmpty;
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};
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#endif // nsRDFConInstanceTestNode_h__
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