gecko-dev/xpcom/ds/nsArray.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2012-05-21 11:12:37 +00:00
/* 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 "nsArray.h"
#include "nsArrayEnumerator.h"
#include "nsIWeakReference.h"
#include "nsIWeakReferenceUtils.h"
#include "nsThreadUtils.h"
// used by IndexOf()
struct findIndexOfClosure
{
nsISupports *targetElement;
uint32_t startIndex;
uint32_t resultIndex;
};
static bool FindElementCallback(void* aElement, void* aClosure);
NS_INTERFACE_MAP_BEGIN(nsArray)
NS_INTERFACE_MAP_ENTRY(nsIArray)
NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsArrayCC)
NS_INTERFACE_MAP_ENTRY(nsIArray)
NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END
nsArrayBase::~nsArrayBase()
{
Clear();
}
NS_IMPL_ADDREF(nsArray)
NS_IMPL_RELEASE(nsArray)
NS_IMPL_CYCLE_COLLECTION_CLASS(nsArrayCC)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsArrayCC)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsArrayCC)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsArrayCC)
tmp->Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsArrayCC)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mArray)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMETHODIMP
nsArrayBase::GetLength(uint32_t* aLength)
{
*aLength = mArray.Count();
return NS_OK;
}
NS_IMETHODIMP
nsArrayBase::QueryElementAt(uint32_t aIndex,
const nsIID& aIID,
void** aResult)
{
nsISupports * obj = mArray.SafeObjectAt(aIndex);
if (!obj) return NS_ERROR_ILLEGAL_VALUE;
// no need to worry about a leak here, because SafeObjectAt()
// doesn't addref its result
return obj->QueryInterface(aIID, aResult);
}
NS_IMETHODIMP
nsArrayBase::IndexOf(uint32_t aStartIndex, nsISupports* aElement,
uint32_t* aResult)
{
// optimize for the common case by forwarding to mArray
if (aStartIndex == 0) {
uint32_t idx = mArray.IndexOf(aElement);
if (idx == UINT32_MAX)
return NS_ERROR_FAILURE;
*aResult = idx;
return NS_OK;
}
findIndexOfClosure closure = { aElement, aStartIndex, 0 };
bool notFound = mArray.EnumerateForwards(FindElementCallback, &closure);
if (notFound)
return NS_ERROR_FAILURE;
*aResult = closure.resultIndex;
return NS_OK;
}
NS_IMETHODIMP
nsArrayBase::Enumerate(nsISimpleEnumerator** aResult)
{
return NS_NewArrayEnumerator(aResult, static_cast<nsIArray*>(this));
}
// nsIMutableArray implementation
NS_IMETHODIMP
nsArrayBase::AppendElement(nsISupports* aElement, bool aWeak)
{
bool result;
if (aWeak) {
nsCOMPtr<nsIWeakReference> elementRef = do_GetWeakReference(aElement);
NS_ASSERTION(elementRef, "AppendElement: Trying to use weak references on an object that doesn't support it");
if (!elementRef)
return NS_ERROR_FAILURE;
result = mArray.AppendObject(elementRef);
}
else {
// add the object directly
result = mArray.AppendObject(aElement);
}
return result ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsArrayBase::RemoveElementAt(uint32_t aIndex)
{
bool result = mArray.RemoveObjectAt(aIndex);
return result ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsArrayBase::InsertElementAt(nsISupports* aElement, uint32_t aIndex, bool aWeak)
{
nsCOMPtr<nsISupports> elementRef;
if (aWeak) {
elementRef = do_GetWeakReference(aElement);
NS_ASSERTION(elementRef, "InsertElementAt: Trying to use weak references on an object that doesn't support it");
if (!elementRef)
return NS_ERROR_FAILURE;
} else {
elementRef = aElement;
}
bool result = mArray.InsertObjectAt(elementRef, aIndex);
return result ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsArrayBase::ReplaceElementAt(nsISupports* aElement, uint32_t aIndex, bool aWeak)
{
nsCOMPtr<nsISupports> elementRef;
if (aWeak) {
elementRef = do_GetWeakReference(aElement);
NS_ASSERTION(elementRef, "ReplaceElementAt: Trying to use weak references on an object that doesn't support it");
if (!elementRef)
return NS_ERROR_FAILURE;
} else {
elementRef = aElement;
}
bool result = mArray.ReplaceObjectAt(elementRef, aIndex);
return result ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsArrayBase::Clear()
{
mArray.Clear();
return NS_OK;
}
//
// static helper routines
//
bool
FindElementCallback(void *aElement, void* aClosure)
{
findIndexOfClosure* closure =
static_cast<findIndexOfClosure*>(aClosure);
nsISupports* element =
static_cast<nsISupports*>(aElement);
// don't start searching until we're past the startIndex
if (closure->resultIndex >= closure->startIndex &&
element == closure->targetElement) {
return false; // stop! We found it
}
closure->resultIndex++;
return true;
}
nsresult
nsArrayBase::XPCOMConstructor(nsISupports* aOuter, const nsIID& aIID, void** aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsCOMPtr<nsIMutableArray> inst = Create();
return inst->QueryInterface(aIID, aResult);
}
already_AddRefed<nsIMutableArray>
nsArrayBase::Create()
{
nsCOMPtr<nsIMutableArray> inst;
if (NS_IsMainThread()) {
inst = new nsArrayCC;
} else {
inst = new nsArray;
}
return inst.forget();
}