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comparison: dom/bindings/MozMap.h
dom/bindings/MozMap.h
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 /** | |
| 8 * Class for representing MozMap arguments. This is an nsTHashtable | |
| 9 * under the hood, but we don't want to leak that implementation | |
| 10 * detail. | |
| 11 */ | |
| 12 | |
| 13 #ifndef mozilla_dom_MozMap_h | |
| 14 #define mozilla_dom_MozMap_h | |
| 15 | |
| 16 #include "nsTHashtable.h" | |
| 17 #include "nsHashKeys.h" | |
| 18 #include "nsStringGlue.h" | |
| 19 #include "nsTArray.h" | |
| 20 #include "mozilla/Move.h" | |
| 21 | |
| 22 namespace mozilla { | |
| 23 namespace dom { | |
| 24 | |
| 25 namespace binding_detail { | |
| 26 template<typename DataType> | |
| 27 class MozMapEntry : public nsStringHashKey | |
| 28 { | |
| 29 public: | |
| 30 MozMapEntry(const nsAString* aKeyTypePointer) | |
| 31 : nsStringHashKey(aKeyTypePointer) | |
| 32 { | |
| 33 } | |
| 34 | |
| 35 // Move constructor so we can do MozMaps of MozMaps. | |
| 36 MozMapEntry(MozMapEntry<DataType>&& aOther) | |
| 37 : nsStringHashKey(aOther), | |
| 38 mData(Move(aOther.mData)) | |
| 39 { | |
| 40 } | |
| 41 | |
| 42 DataType mData; | |
| 43 }; | |
| 44 } // namespace binding_detail | |
| 45 | |
| 46 template<typename DataType> | |
| 47 class MozMap : protected nsTHashtable<binding_detail::MozMapEntry<DataType>> | |
| 48 { | |
| 49 public: | |
| 50 typedef typename binding_detail::MozMapEntry<DataType> EntryType; | |
| 51 typedef nsTHashtable<EntryType> Base; | |
| 52 typedef MozMap<DataType> SelfType; | |
| 53 | |
| 54 MozMap() | |
| 55 { | |
| 56 } | |
| 57 | |
| 58 // Move constructor so we can do MozMap of MozMap. | |
| 59 MozMap(SelfType&& aOther) : | |
| 60 Base(Move(aOther)) | |
| 61 { | |
| 62 } | |
| 63 | |
| 64 // The return value is only safe to use until an AddEntry call. | |
| 65 const DataType& Get(const nsAString& aKey) const | |
| 66 { | |
| 67 const EntryType* ent = this->GetEntry(aKey); | |
| 68 MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?"); | |
| 69 return ent->mData; | |
| 70 } | |
| 71 | |
| 72 // The return value is only safe to use until an AddEntry call. | |
| 73 const DataType* GetIfExists(const nsAString& aKey) const | |
| 74 { | |
| 75 const EntryType* ent = this->GetEntry(aKey); | |
| 76 if (!ent) { | |
| 77 return nullptr; | |
| 78 } | |
| 79 return &ent->mData; | |
| 80 } | |
| 81 | |
| 82 void GetKeys(nsTArray<nsString>& aKeys) const { | |
| 83 // Sadly, EnumerateEntries is not a const method | |
| 84 const_cast<SelfType*>(this)->EnumerateEntries(KeyEnumerator, &aKeys); | |
| 85 } | |
| 86 | |
| 87 // XXXbz we expose this generic enumerator for tracing. Otherwise we'd end up | |
| 88 // with a dependency on BindingUtils.h here for the SequenceTracer bits. | |
| 89 typedef PLDHashOperator (* Enumerator)(DataType* aValue, void* aClosure); | |
| 90 void EnumerateValues(Enumerator aEnumerator, void *aClosure) | |
| 91 { | |
| 92 ValueEnumClosure args = { aEnumerator, aClosure }; | |
| 93 this->EnumerateEntries(ValueEnumerator, &args); | |
| 94 } | |
| 95 | |
| 96 DataType* AddEntry(const nsAString& aKey) NS_WARN_UNUSED_RESULT | |
| 97 { | |
| 98 // XXXbz can't just use fallible_t() because our superclass has a | |
| 99 // private typedef by that name. | |
| 100 EntryType* ent = this->PutEntry(aKey, mozilla::fallible_t()); | |
| 101 if (!ent) { | |
| 102 return nullptr; | |
| 103 } | |
| 104 return &ent->mData; | |
| 105 } | |
| 106 | |
| 107 private: | |
| 108 static PLDHashOperator | |
| 109 KeyEnumerator(EntryType* aEntry, void* aClosure) | |
| 110 { | |
| 111 nsTArray<nsString>& keys = *static_cast<nsTArray<nsString>*>(aClosure); | |
| 112 keys.AppendElement(aEntry->GetKey()); | |
| 113 return PL_DHASH_NEXT; | |
| 114 } | |
| 115 | |
| 116 struct ValueEnumClosure { | |
| 117 Enumerator mEnumerator; | |
| 118 void* mClosure; | |
| 119 }; | |
| 120 | |
| 121 static PLDHashOperator | |
| 122 ValueEnumerator(EntryType* aEntry, void* aClosure) | |
| 123 { | |
| 124 ValueEnumClosure* enumClosure = static_cast<ValueEnumClosure*>(aClosure); | |
| 125 return enumClosure->mEnumerator(&aEntry->mData, enumClosure->mClosure); | |
| 126 } | |
| 127 }; | |
| 128 | |
| 129 } // namespace dom | |
| 130 } // namespace mozilla | |
| 131 | |
| 132 #endif // mozilla_dom_MozMap_h |
