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gecko-dev/xpcom/ds/nsSupportsArray.cpp

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10 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "nsSupportsArray.h"
#include "nsSupportsArrayEnumerator.h"
#include <string.h>
static const PRUint32 kGrowArrayBy = 8;
nsSupportsArray::nsSupportsArray()
{
NS_INIT_REFCNT();
mArray = &(mAutoArray[0]);
mArraySize = kAutoArraySize;
mCount = 0;
}
nsSupportsArray::~nsSupportsArray()
{
DeleteArray();
}
NS_METHOD
nsSupportsArray::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsSupportsArray *it = new nsSupportsArray();
if (it == NULL)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(it);
nsresult rv = it->QueryInterface(aIID, aResult);
NS_RELEASE(it);
return rv;
}
NS_IMPL_THREADSAFE_ISUPPORTS1(nsSupportsArray, nsISupportsArray)
void nsSupportsArray::DeleteArray(void)
{
Clear();
if (mArray != &(mAutoArray[0])) {
delete[] mArray;
mArray = &(mAutoArray[0]);
mArraySize = kAutoArraySize;
}
}
#if 0
NS_IMETHODIMP_(nsISupportsArray&)
nsISupportsArray::operator=(const nsISupportsArray& other)
{
NS_ASSERTION(0, "should be an abstract method");
return *this; // bogus
}
#endif
NS_IMETHODIMP_(nsISupportsArray&)
nsSupportsArray::operator=(nsISupportsArray const& aOther)
{
PRUint32 otherCount = 0;
nsresult rv = ((nsISupportsArray&)aOther).Count(&otherCount);
NS_ASSERTION(NS_SUCCEEDED(rv), "this method should return an error!");
if (NS_FAILED(rv)) return *this;
if (otherCount > mArraySize) {
DeleteArray();
mArraySize = otherCount;
mArray = new nsISupports*[mArraySize];
}
else {
Clear();
}
mCount = otherCount;
while (0 < otherCount--) {
mArray[otherCount] = ((nsISupportsArray&)aOther).ElementAt(otherCount);
}
return *this;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::Equals(const nsISupportsArray* aOther)
{
if (0 != aOther) {
const nsSupportsArray* other = (const nsSupportsArray*)aOther;
if (mCount == other->mCount) {
PRUint32 aIndex = mCount;
while (0 < aIndex--) {
if (mArray[aIndex] != other->mArray[aIndex]) {
return PR_FALSE;
}
}
return PR_TRUE;
}
}
return PR_FALSE;
}
NS_IMETHODIMP_(nsISupports*)
nsSupportsArray::ElementAt(PRUint32 aIndex)
{
if (aIndex < mCount) {
nsISupports* element = mArray[aIndex];
NS_ADDREF(element);
return element;
}
return 0;
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::IndexOf(const nsISupports* aPossibleElement)
{
return IndexOfStartingAt(aPossibleElement, 0);
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::IndexOfStartingAt(const nsISupports* aPossibleElement,
PRUint32 aStartIndex)
{
if (aStartIndex < mCount) {
const nsISupports** start = (const nsISupports**)mArray; // work around goofy compiler behavior
const nsISupports** ep = (start + aStartIndex);
const nsISupports** end = (start + mCount);
while (ep < end) {
if (aPossibleElement == *ep) {
return (ep - start);
}
ep++;
}
}
return -1;
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::LastIndexOf(const nsISupports* aPossibleElement)
{
if (0 < mCount) {
const nsISupports** start = (const nsISupports**)mArray; // work around goofy compiler behavior
const nsISupports** ep = (start + mCount);
while (start <= --ep) {
if (aPossibleElement == *ep) {
return (ep - start);
}
}
}
return -1;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::InsertElementAt(nsISupports* aElement, PRUint32 aIndex)
{
if (!aElement) {
return PR_FALSE;
}
if (aIndex <= mCount) {
if (mArraySize < (mCount + 1)) { // need to grow the array
mArraySize += kGrowArrayBy;
nsISupports** oldArray = mArray;
mArray = new nsISupports*[mArraySize];
if (0 == mArray) { // ran out of memory
mArray = oldArray;
mArraySize -= kGrowArrayBy;
return PR_FALSE;
}
if (0 != oldArray) { // need to move old data
if (0 < aIndex) {
::memcpy(mArray, oldArray, aIndex * sizeof(nsISupports*));
}
PRUint32 slide = (mCount - aIndex);
if (0 < slide) {
::memcpy(mArray + aIndex + 1, oldArray + aIndex, slide * sizeof(nsISupports*));
}
if (oldArray != &(mAutoArray[0])) {
delete[] oldArray;
}
}
}
else {
PRUint32 slide = (mCount - aIndex);
if (0 < slide) {
::memmove(mArray + aIndex + 1, mArray + aIndex, slide * sizeof(nsISupports*));
}
}
mArray[aIndex] = aElement;
NS_ADDREF(aElement);
mCount++;
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::ReplaceElementAt(nsISupports* aElement, PRUint32 aIndex)
{
if (aIndex < mCount) {
NS_ADDREF(aElement); // addref first in case it's the same object!
NS_RELEASE(mArray[aIndex]);
mArray[aIndex] = aElement;
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveElementAt(PRUint32 aIndex)
{
if (aIndex < mCount) {
NS_RELEASE(mArray[aIndex]);
mCount--;
PRInt32 slide = (mCount - aIndex);
if (0 < slide) {
::memmove(mArray + aIndex, mArray + aIndex + 1,
slide * sizeof(nsISupports*));
}
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveElement(const nsISupports* aElement, PRUint32 aStartIndex)
{
if (aStartIndex < mCount) {
nsISupports** ep = mArray;
nsISupports** end = ep + mCount;
while (ep < end) {
if (*ep == aElement) {
return RemoveElementAt(PRUint32(ep - mArray));
}
ep++;
}
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveLastElement(const nsISupports* aElement)
{
if (0 < mCount) {
nsISupports** ep = (mArray + mCount);
while (mArray <= --ep) {
if (*ep == aElement) {
return RemoveElementAt(PRUint32(ep - mArray));
}
}
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::AppendElements(nsISupportsArray* aElements)
{
nsSupportsArray* elements = (nsSupportsArray*)aElements;
if (elements && (0 < elements->mCount)) {
if (mArraySize < (mCount + elements->mCount)) { // need to grow the array
PRUint32 count = mCount + elements->mCount;
PRUint32 oldSize = mArraySize;
while (mArraySize < count) { // ick
mArraySize += kGrowArrayBy;
}
nsISupports** oldArray = mArray;
mArray = new nsISupports*[mArraySize];
if (0 == mArray) { // ran out of memory
mArray = oldArray;
mArraySize = oldSize;
return PR_FALSE;
}
if (0 != oldArray) { // need to move old data
if (0 < mCount) {
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
}
if (oldArray != &(mAutoArray[0])) {
delete[] oldArray;
}
}
}
PRUint32 aIndex = 0;
while (aIndex < elements->mCount) {
NS_ADDREF(elements->mArray[aIndex]);
mArray[mCount++] = elements->mArray[aIndex++];
}
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP
nsSupportsArray::Clear(void)
{
if (0 < mCount) {
do {
--mCount;
NS_RELEASE(mArray[mCount]);
} while (0 != mCount);
}
return NS_OK;
}
NS_IMETHODIMP
nsSupportsArray::Compact(void)
{
if ((mArraySize != mCount) && (kAutoArraySize < mArraySize)) {
nsISupports** oldArray = mArray;
PRUint32 oldArraySize = mArraySize;
if (mCount <= kAutoArraySize) {
mArray = &(mAutoArray[0]);
mArraySize = kAutoArraySize;
}
else {
mArray = new nsISupports*[mCount];
mArraySize = mCount;
}
if (0 == mArray) {
mArray = oldArray;
mArraySize = oldArraySize;
return NS_OK;
}
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
delete[] oldArray;
}
return NS_OK;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::EnumerateForwards(nsISupportsArrayEnumFunc aFunc, void* aData)
{
PRInt32 aIndex = -1;
PRBool running = PR_TRUE;
while (running && (++aIndex < (PRInt32)mCount)) {
running = (*aFunc)(mArray[aIndex], aData);
}
return running;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::EnumerateBackwards(nsISupportsArrayEnumFunc aFunc, void* aData)
{
PRUint32 aIndex = mCount;
PRBool running = PR_TRUE;
while (running && (0 < aIndex--)) {
running = (*aFunc)(mArray[aIndex], aData);
}
return running;
}
NS_IMETHODIMP
nsSupportsArray::Enumerate(nsIEnumerator* *result)
{
nsSupportsArrayEnumerator* e = new nsSupportsArrayEnumerator(this);
if (!e)
return NS_ERROR_OUT_OF_MEMORY;
*result = e;
NS_ADDREF(e);
return NS_OK;
}
static PRBool
CopyElement(nsISupports* aElement, void *aData)
{
nsresult rv;
nsISupportsArray* newArray = (nsISupportsArray*)aData;
rv = newArray->AppendElement(aElement);
return NS_SUCCEEDED(rv);
}
NS_IMETHODIMP
nsSupportsArray::Clone(nsISupportsArray* *result)
{
nsresult rv;
nsISupportsArray* newArray;
rv = NS_NewISupportsArray(&newArray);
PRBool ok = EnumerateForwards(CopyElement, newArray);
if (!ok) return NS_ERROR_OUT_OF_MEMORY;
*result = newArray;
return NS_OK;
}
NS_COM nsresult
NS_NewISupportsArray(nsISupportsArray** aInstancePtrResult)
{
nsresult rv;
rv = nsSupportsArray::Create(NULL, NS_GET_IID(nsISupportsArray),
(void**)aInstancePtrResult);
return rv;
}
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