mirror of
https://github.com/mozilla/gecko-dev.git
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138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/**
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* Class for representing MozMap arguments. This is an nsTHashtable
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* under the hood, but we don't want to leak that implementation
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* detail.
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*/
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#ifndef mozilla_dom_MozMap_h
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#define mozilla_dom_MozMap_h
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#include "nsTHashtable.h"
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#include "nsHashKeys.h"
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#include "nsStringGlue.h"
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#include "nsTArray.h"
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#include "mozilla/Move.h"
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namespace mozilla {
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namespace dom {
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namespace binding_detail {
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template<typename DataType>
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class MozMapEntry : public nsStringHashKey
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{
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public:
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explicit MozMapEntry(const nsAString* aKeyTypePointer)
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: nsStringHashKey(aKeyTypePointer)
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{
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}
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// Move constructor so we can do MozMaps of MozMaps.
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MozMapEntry(MozMapEntry<DataType>&& aOther)
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: nsStringHashKey(aOther),
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mData(Move(aOther.mData))
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{
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}
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DataType mData;
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};
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} // namespace binding_detail
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template<typename DataType>
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class MozMap : protected nsTHashtable<binding_detail::MozMapEntry<DataType>>
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{
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public:
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typedef typename binding_detail::MozMapEntry<DataType> EntryType;
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typedef nsTHashtable<EntryType> Base;
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typedef MozMap<DataType> SelfType;
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MozMap()
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{
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}
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// Move constructor so we can do MozMap of MozMap.
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MozMap(SelfType&& aOther) :
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Base(Move(aOther))
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{
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}
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// The return value is only safe to use until an AddEntry call.
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const DataType& Get(const nsAString& aKey) const
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{
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const EntryType* ent = this->GetEntry(aKey);
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MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
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return ent->mData;
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}
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DataType& Get(const nsAString& aKey)
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{
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EntryType* ent = this->GetEntry(aKey);
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MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
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return ent->mData;
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}
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// The return value is only safe to use until an AddEntry call.
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const DataType* GetIfExists(const nsAString& aKey) const
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{
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const EntryType* ent = this->GetEntry(aKey);
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if (!ent) {
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return nullptr;
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}
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return &ent->mData;
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}
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void GetKeys(nsTArray<nsString>& aKeys) const {
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// Sadly, EnumerateEntries is not a const method
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const_cast<SelfType*>(this)->EnumerateEntries(KeyEnumerator, &aKeys);
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}
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// XXXbz we expose this generic enumerator for tracing. Otherwise we'd end up
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// with a dependency on BindingUtils.h here for the SequenceTracer bits.
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typedef PLDHashOperator (* Enumerator)(DataType* aValue, void* aClosure);
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void EnumerateValues(Enumerator aEnumerator, void *aClosure)
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{
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ValueEnumClosure args = { aEnumerator, aClosure };
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this->EnumerateEntries(ValueEnumerator, &args);
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}
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DataType* AddEntry(const nsAString& aKey) NS_WARN_UNUSED_RESULT
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{
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EntryType* ent = this->PutEntry(aKey, fallible);
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if (!ent) {
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return nullptr;
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}
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return &ent->mData;
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}
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private:
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static PLDHashOperator
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KeyEnumerator(EntryType* aEntry, void* aClosure)
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{
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nsTArray<nsString>& keys = *static_cast<nsTArray<nsString>*>(aClosure);
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keys.AppendElement(aEntry->GetKey());
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return PL_DHASH_NEXT;
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}
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struct ValueEnumClosure {
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Enumerator mEnumerator;
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void* mClosure;
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};
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static PLDHashOperator
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ValueEnumerator(EntryType* aEntry, void* aClosure)
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{
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ValueEnumClosure* enumClosure = static_cast<ValueEnumClosure*>(aClosure);
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return enumClosure->mEnumerator(&aEntry->mData, enumClosure->mClosure);
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}
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_MozMap_h
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