mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 08:35:26 +00:00
91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/* -*- 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/. */
|
|
|
|
#include "nsIStringEnumerator.h"
|
|
#include "nsStringFwd.h"
|
|
#include "nsTArrayForwardDeclare.h"
|
|
|
|
// nsIStringEnumerator/nsIUTF8StringEnumerator implementations
|
|
//
|
|
// Currently all implementations support both interfaces. The
|
|
// constructors below provide the most common interface for the given
|
|
// type (i.e. nsIStringEnumerator for char16_t* strings, and so
|
|
// forth) but any resulting enumerators can be queried to the other
|
|
// type. Internally, the enumerators will hold onto the type that was
|
|
// passed in and do conversion if GetNext() for the other type of
|
|
// string is called.
|
|
|
|
// There are a few different types of enumerators:
|
|
|
|
//
|
|
// These enumerators hold a pointer to the array. Be careful
|
|
// because modifying the array may confuse the iterator, especially if
|
|
// you insert or remove elements in the middle of the array.
|
|
//
|
|
|
|
// The non-adopting enumerator requires that the array sticks around
|
|
// at least as long as the enumerator does. These are for constant
|
|
// string arrays that the enumerator does not own, this could be used
|
|
// in VERY specialized cases such as when the provider KNOWS that the
|
|
// string enumerator will be consumed immediately, or will at least
|
|
// outlast the array.
|
|
// For example:
|
|
//
|
|
// nsTArray<nsCString> array;
|
|
// array.AppendCString("abc");
|
|
// array.AppendCString("def");
|
|
// NS_NewStringEnumerator(&enumerator, &array, true);
|
|
//
|
|
// // call some internal method which iterates the enumerator
|
|
// InternalMethod(enumerator);
|
|
// NS_RELEASE(enumerator);
|
|
//
|
|
nsresult
|
|
NS_NewStringEnumerator(nsIStringEnumerator** aResult,
|
|
const nsTArray<nsString>* aArray,
|
|
nsISupports* aOwner);
|
|
nsresult
|
|
NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
|
|
const nsTArray<nsCString>* aArray);
|
|
|
|
nsresult
|
|
NS_NewStringEnumerator(nsIStringEnumerator** aResult,
|
|
const nsTArray<nsString>* aArray);
|
|
|
|
// Adopting string enumerators assume ownership of the array and will
|
|
// call |operator delete| on the array when the enumerator is destroyed
|
|
// this is useful when the provider creates an array solely for the
|
|
// purpose of creating the enumerator.
|
|
// For example:
|
|
//
|
|
// nsTArray<nsCString>* array = new nsTArray<nsCString>;
|
|
// array->AppendString("abcd");
|
|
// NS_NewAdoptingStringEnumerator(&result, array);
|
|
nsresult
|
|
NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
|
|
nsTArray<nsString>* aArray);
|
|
|
|
nsresult
|
|
NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
|
|
nsTArray<nsCString>* aArray);
|
|
|
|
|
|
// these versions take a refcounted "owner" which will be addreffed
|
|
// when the enumerator is created, and destroyed when the enumerator
|
|
// is released. This allows providers to give non-owning pointers to
|
|
// ns*StringArray member variables without worrying about lifetime
|
|
// issues
|
|
// For example:
|
|
//
|
|
// nsresult MyClass::Enumerate(nsIUTF8StringEnumerator** aResult) {
|
|
// mCategoryList->AppendString("abcd");
|
|
// return NS_NewStringEnumerator(aResult, mCategoryList, this);
|
|
// }
|
|
//
|
|
nsresult
|
|
NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
|
|
const nsTArray<nsCString>* aArray,
|
|
nsISupports* aOwner);
|