/* -*- 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/. */ #ifndef nsContentSupportMap_h__ #define nsContentSupportMap_h__ #include "PLDHashTable.h" #include "nsTemplateMatch.h" /** * The nsContentSupportMap maintains a mapping from a "resource element" * in the content tree to the nsTemplateMatch that was used to instantiate it. This * is necessary to allow the XUL content to be built lazily. Specifically, * when building "resumes" on a partially-built content element, the builder * will walk upwards in the content tree to find the first element with an * 'id' attribute. This element is assumed to be the "resource element", * and allows the content builder to access the nsTemplateMatch (variable assignments * and rule information). */ class nsContentSupportMap { public: nsContentSupportMap() : mMap(PLDHashTable::StubOps(), sizeof(Entry)) { } ~nsContentSupportMap() { } nsresult Put(nsIContent* aElement, nsTemplateMatch* aMatch) { PLDHashEntryHdr* hdr = mMap.Add(aElement, mozilla::fallible); if (!hdr) return NS_ERROR_OUT_OF_MEMORY; Entry* entry = static_cast<Entry*>(hdr); NS_ASSERTION(entry->mMatch == nullptr, "over-writing entry"); entry->mContent = aElement; entry->mMatch = aMatch; return NS_OK; } bool Get(nsIContent* aElement, nsTemplateMatch** aMatch) { PLDHashEntryHdr* hdr = mMap.Search(aElement); if (!hdr) return false; Entry* entry = static_cast<Entry*>(hdr); *aMatch = entry->mMatch; return true; } void Remove(nsIContent* aElement); void Clear() { mMap.Clear(); } protected: PLDHashTable mMap; struct Entry : public PLDHashEntryHdr { nsIContent* mContent; nsTemplateMatch* mMatch; }; }; #endif