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comparison: xpcom/ds/nsStringEnumerator.h
xpcom/ds/nsStringEnumerator.h
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 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 | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsIStringEnumerator.h" | |
| 7 #include "nsStringFwd.h" | |
| 8 #include "nsTArrayForwardDeclare.h" | |
| 9 | |
| 10 // nsIStringEnumerator/nsIUTF8StringEnumerator implementations | |
| 11 // | |
| 12 // Currently all implementations support both interfaces. The | |
| 13 // constructors below provide the most common interface for the given | |
| 14 // type (i.e. nsIStringEnumerator for char16_t* strings, and so | |
| 15 // forth) but any resulting enumerators can be queried to the other | |
| 16 // type. Internally, the enumerators will hold onto the type that was | |
| 17 // passed in and do conversion if GetNext() for the other type of | |
| 18 // string is called. | |
| 19 | |
| 20 // There are a few different types of enumerators: | |
| 21 | |
| 22 // | |
| 23 // These enumerators hold a pointer to the array. Be careful | |
| 24 // because modifying the array may confuse the iterator, especially if | |
| 25 // you insert or remove elements in the middle of the array. | |
| 26 // | |
| 27 | |
| 28 // The non-adopting enumerator requires that the array sticks around | |
| 29 // at least as long as the enumerator does. These are for constant | |
| 30 // string arrays that the enumerator does not own, this could be used | |
| 31 // in VERY specialized cases such as when the provider KNOWS that the | |
| 32 // string enumerator will be consumed immediately, or will at least | |
| 33 // outlast the array. | |
| 34 // For example: | |
| 35 // | |
| 36 // nsTArray<nsCString> array; | |
| 37 // array.AppendCString("abc"); | |
| 38 // array.AppendCString("def"); | |
| 39 // NS_NewStringEnumerator(&enumerator, &array, true); | |
| 40 // | |
| 41 // // call some internal method which iterates the enumerator | |
| 42 // InternalMethod(enumerator); | |
| 43 // NS_RELEASE(enumerator); | |
| 44 // | |
| 45 nsresult | |
| 46 NS_NewStringEnumerator(nsIStringEnumerator** aResult, | |
| 47 const nsTArray<nsString>* aArray, | |
| 48 nsISupports* aOwner); | |
| 49 nsresult | |
| 50 NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult, | |
| 51 const nsTArray<nsCString>* aArray); | |
| 52 | |
| 53 nsresult | |
| 54 NS_NewStringEnumerator(nsIStringEnumerator** aResult, | |
| 55 const nsTArray<nsString>* aArray); | |
| 56 | |
| 57 // Adopting string enumerators assume ownership of the array and will | |
| 58 // call |operator delete| on the array when the enumerator is destroyed | |
| 59 // this is useful when the provider creates an array solely for the | |
| 60 // purpose of creating the enumerator. | |
| 61 // For example: | |
| 62 // | |
| 63 // nsTArray<nsCString>* array = new nsTArray<nsCString>; | |
| 64 // array->AppendString("abcd"); | |
| 65 // NS_NewAdoptingStringEnumerator(&result, array); | |
| 66 nsresult | |
| 67 NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult, | |
| 68 nsTArray<nsString>* aArray); | |
| 69 | |
| 70 nsresult | |
| 71 NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult, | |
| 72 nsTArray<nsCString>* aArray); | |
| 73 | |
| 74 | |
| 75 // these versions take a refcounted "owner" which will be addreffed | |
| 76 // when the enumerator is created, and destroyed when the enumerator | |
| 77 // is released. This allows providers to give non-owning pointers to | |
| 78 // ns*StringArray member variables without worrying about lifetime | |
| 79 // issues | |
| 80 // For example: | |
| 81 // | |
| 82 // nsresult MyClass::Enumerate(nsIUTF8StringEnumerator** aResult) { | |
| 83 // mCategoryList->AppendString("abcd"); | |
| 84 // return NS_NewStringEnumerator(aResult, mCategoryList, this); | |
| 85 // } | |
| 86 // | |
| 87 nsresult | |
| 88 NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult, | |
| 89 const nsTArray<nsCString>* aArray, | |
| 90 nsISupports* aOwner); |
