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