gecko-dev/xpcom/ds/nsSupportsArray.cpp

383 lines
10 KiB
C++

/* -*- 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsISupportsArray.h"
static NS_DEFINE_IID(kISupportsArrayIID, NS_ISUPPORTSARRAY_IID);
static const PRInt32 kGrowArrayBy = 8;
static const PRInt32 kAutoArraySize = 4;
class SupportsArrayImpl : public nsISupportsArray {
public:
SupportsArrayImpl(void);
~SupportsArrayImpl(void);
NS_DECL_ISUPPORTS
NS_IMETHOD_(nsISupportsArray&) operator=(const nsISupportsArray& aOther);
NS_IMETHOD_(PRBool) operator==(const nsISupportsArray& aOther) const { return Equals(&aOther); }
NS_IMETHOD_(PRBool) Equals(const nsISupportsArray* aOther) const;
NS_IMETHOD_(PRInt32) Count(void) const { return mCount; }
NS_IMETHOD_(nsISupports*) ElementAt(PRInt32 aIndex) const;
NS_IMETHOD_(nsISupports*) operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
NS_IMETHOD_(PRInt32) IndexOf(const nsISupports* aPossibleElement, PRInt32 aStartIndex = 0) const;
NS_IMETHOD_(PRInt32) LastIndexOf(const nsISupports* aPossibleElement) const;
NS_IMETHOD_(PRBool) InsertElementAt(nsISupports* aElement, PRInt32 aIndex);
NS_IMETHOD_(PRBool) ReplaceElementAt(nsISupports* aElement, PRInt32 aIndex);
NS_IMETHOD_(PRBool) AppendElement(nsISupports* aElement) {
return InsertElementAt(aElement, mCount);
}
NS_IMETHOD_(PRBool) RemoveElementAt(PRInt32 aIndex);
NS_IMETHOD_(PRBool) RemoveElement(const nsISupports* aElement, PRInt32 aStartIndex = 0);
NS_IMETHOD_(PRBool) RemoveLastElement(const nsISupports* aElement);
NS_IMETHOD_(PRBool) AppendElements(nsISupportsArray* aElements);
NS_IMETHOD_(void) Clear(void);
NS_IMETHOD_(void) Compact(void);
NS_IMETHOD_(PRBool) EnumerateForwards(nsISupportsArrayEnumFunc aFunc, void* aData) const;
NS_IMETHOD_(PRBool) EnumerateBackwards(nsISupportsArrayEnumFunc aFunc, void* aData) const;
protected:
void DeleteArray(void);
nsISupports** mArray;
PRInt32 mArraySize;
PRInt32 mCount;
nsISupports* mAutoArray[kAutoArraySize];
private:
// Copy constructors are not allowed
SupportsArrayImpl(const nsISupportsArray& other);
};
SupportsArrayImpl::SupportsArrayImpl()
{
NS_INIT_REFCNT();
mArray = &(mAutoArray[0]);
mArraySize = kAutoArraySize;
mCount = 0;
}
SupportsArrayImpl::~SupportsArrayImpl()
{
DeleteArray();
}
NS_IMPL_ISUPPORTS(SupportsArrayImpl, kISupportsArrayIID);
void SupportsArrayImpl::DeleteArray(void)
{
Clear();
if (mArray != &(mAutoArray[0])) {
delete[] mArray;
mArray = &(mAutoArray[0]);
mArraySize = kAutoArraySize;
}
}
nsISupportsArray& SupportsArrayImpl::operator=(const nsISupportsArray& aOther)
{
PRInt32 otherCount = aOther.Count();
if (otherCount > mArraySize) {
DeleteArray();
mArraySize = otherCount;
mArray = new nsISupports*[mArraySize];
}
else {
Clear();
}
mCount = otherCount;
while (0 <= --otherCount) {
mArray[otherCount] = aOther.ElementAt(otherCount);
}
return *this;
}
PRBool SupportsArrayImpl::Equals(const nsISupportsArray* aOther) const
{
if (0 != aOther) {
const SupportsArrayImpl* other = (const SupportsArrayImpl*)aOther;
if (mCount == other->mCount) {
PRInt32 index = mCount;
while (0 <= --index) {
if (mArray[index] != other->mArray[index]) {
return PR_FALSE;
}
}
return PR_TRUE;
}
}
return PR_FALSE;
}
nsISupports* SupportsArrayImpl::ElementAt(PRInt32 aIndex) const
{
if ((0 <= aIndex) && (aIndex < mCount)) {
nsISupports* element = mArray[aIndex];
NS_ADDREF(element);
return element;
}
return 0;
}
PRInt32 SupportsArrayImpl::IndexOf(const nsISupports* aPossibleElement, PRInt32 aStartIndex) const
{
if ((0 <= aStartIndex) && (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;
}
PRInt32 SupportsArrayImpl::LastIndexOf(const nsISupports* aPossibleElement) const
{
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;
}
PRBool SupportsArrayImpl::InsertElementAt(nsISupports* aElement, PRInt32 aIndex)
{
if ((0 <= aIndex) && (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*));
}
PRInt32 slide = (mCount - aIndex);
if (0 < slide) {
::memcpy(mArray + aIndex + 1, oldArray + aIndex, slide * sizeof(nsISupports*));
}
if (oldArray != &(mAutoArray[0])) {
delete[] oldArray;
}
}
}
else {
PRInt32 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;
}
PRBool SupportsArrayImpl::ReplaceElementAt(nsISupports* aElement, PRInt32 aIndex)
{
if ((0 <= aIndex) && (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;
}
PRBool SupportsArrayImpl::RemoveElementAt(PRInt32 aIndex)
{
if ((0 <= aIndex) && (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;
}
PRBool SupportsArrayImpl::RemoveElement(const nsISupports* aElement, PRInt32 aStartIndex)
{
if ((0 <= aStartIndex) && (aStartIndex < mCount)) {
nsISupports** ep = mArray;
nsISupports** end = ep + mCount;
while (ep < end) {
if (*ep == aElement) {
return RemoveElementAt(PRInt32(ep - mArray));
}
ep++;
}
}
return PR_FALSE;
}
PRBool SupportsArrayImpl::RemoveLastElement(const nsISupports* aElement)
{
if (0 < mCount) {
nsISupports** ep = (mArray + mCount);
while (mArray <= --ep) {
if (*ep == aElement) {
return RemoveElementAt(PRInt32(ep - mArray));
}
}
}
return PR_FALSE;
}
PRBool SupportsArrayImpl::AppendElements(nsISupportsArray* aElements)
{
SupportsArrayImpl* elements = (SupportsArrayImpl*)aElements;
if (elements && (0 < elements->mCount)) {
if (mArraySize < (mCount + elements->mCount)) { // need to grow the array
PRInt32 count = mCount + elements->mCount;
PRInt32 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);
}
if (oldArray != &(mAutoArray[0])) {
delete[] oldArray;
}
}
}
PRInt32 index = 0;
while (index < elements->mCount) {
NS_ADDREF(elements->mArray[index]);
mArray[mCount++] = elements->mArray[index++];
}
return PR_TRUE;
}
return PR_FALSE;
}
void SupportsArrayImpl::Clear(void)
{
while (0 <= --mCount) {
NS_RELEASE(mArray[mCount]);
}
mCount = 0;
}
void SupportsArrayImpl::Compact(void)
{
if ((mArraySize != mCount) && (kAutoArraySize < mArraySize)) {
nsISupports** oldArray = mArray;
PRInt32 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;
}
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
delete[] oldArray;
}
}
PRBool SupportsArrayImpl::EnumerateForwards(nsISupportsArrayEnumFunc aFunc, void* aData) const
{
PRInt32 index = -1;
PRBool running = PR_TRUE;
while (running && (++index < mCount)) {
running = (*aFunc)(mArray[index], aData);
}
return running;
}
PRBool SupportsArrayImpl::EnumerateBackwards(nsISupportsArrayEnumFunc aFunc, void* aData) const
{
PRInt32 index = mCount;
PRBool running = PR_TRUE;
while (running && (0 <= --index)) {
running = (*aFunc)(mArray[index], aData);
}
return running;
}
NS_COM nsresult
NS_NewISupportsArray(nsISupportsArray** aInstancePtrResult)
{
if (aInstancePtrResult == 0) {
return NS_ERROR_NULL_POINTER;
}
SupportsArrayImpl *it = new SupportsArrayImpl();
if (0 == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kISupportsArrayIID, (void **) aInstancePtrResult);
}