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comparison: content/base/src/nsAttrValueOrString.h
content/base/src/nsAttrValueOrString.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 4 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * A wrapper to contain either an nsAttrValue or an nsAString. This is useful | |
| 8 * because constructing an nsAttrValue from an nsAString can be expensive when | |
| 9 * the buffer of the string is not shared. | |
| 10 * | |
| 11 * Since a raw pointer to the passed-in string is kept, this class should only | |
| 12 * be used on the stack. | |
| 13 */ | |
| 14 | |
| 15 #ifndef nsAttrValueOrString_h___ | |
| 16 #define nsAttrValueOrString_h___ | |
| 17 | |
| 18 #include "nsString.h" | |
| 19 #include "nsAttrValue.h" | |
| 20 | |
| 21 class MOZ_STACK_CLASS nsAttrValueOrString | |
| 22 { | |
| 23 public: | |
| 24 nsAttrValueOrString(const nsAString& aValue) | |
| 25 : mAttrValue(nullptr) | |
| 26 , mStringPtr(&aValue) | |
| 27 , mCheapString(nullptr) | |
| 28 { } | |
| 29 nsAttrValueOrString(const nsAttrValue& aValue) | |
| 30 : mAttrValue(&aValue) | |
| 31 , mStringPtr(nullptr) | |
| 32 , mCheapString(nullptr) | |
| 33 { } | |
| 34 | |
| 35 /** | |
| 36 * Returns a reference to the string value of the contents of this object. | |
| 37 * | |
| 38 * When this object points to a string or an nsAttrValue of string or atom | |
| 39 * type this should be fairly cheap. Other nsAttrValue types will be | |
| 40 * serialized the first time this is called and cached from thereon. | |
| 41 */ | |
| 42 const nsAString& String() const; | |
| 43 | |
| 44 /** | |
| 45 * Compares the string representation of this object with the string | |
| 46 * representation of an nsAttrValue. | |
| 47 */ | |
| 48 bool EqualsAsStrings(const nsAttrValue& aOther) const | |
| 49 { | |
| 50 if (mStringPtr) { | |
| 51 return aOther.Equals(*mStringPtr, eCaseMatters); | |
| 52 } | |
| 53 return aOther.EqualsAsStrings(*mAttrValue); | |
| 54 } | |
| 55 | |
| 56 protected: | |
| 57 const nsAttrValue* mAttrValue; | |
| 58 mutable const nsAString* mStringPtr; | |
| 59 mutable nsCheapString mCheapString; | |
| 60 }; | |
| 61 | |
| 62 #endif // nsAttrValueOrString_h___ |
