mirror of
https://github.com/rn10950/RetroZilla.git
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211 lines
6.4 KiB
C++
211 lines
6.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is XPCOM Array implementation.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corp.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Alec Flett <alecf@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsArrayEnumerator.h"
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NS_IMPL_ISUPPORTS1(nsSimpleArrayEnumerator, nsISimpleEnumerator)
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NS_IMETHODIMP
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nsSimpleArrayEnumerator::HasMoreElements(PRBool* aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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if (!mValueArray) {
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*aResult = PR_FALSE;
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return NS_OK;
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}
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PRUint32 cnt;
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nsresult rv = mValueArray->GetLength(&cnt);
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if (NS_FAILED(rv)) return rv;
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*aResult = (mIndex < cnt);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSimpleArrayEnumerator::GetNext(nsISupports** aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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if (!mValueArray) {
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*aResult = nsnull;
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return NS_OK;
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}
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PRUint32 cnt;
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nsresult rv = mValueArray->GetLength(&cnt);
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if (NS_FAILED(rv)) return rv;
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if (mIndex >= cnt)
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return NS_ERROR_UNEXPECTED;
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return mValueArray->QueryElementAt(mIndex++, NS_GET_IID(nsISupports), (void**)aResult);
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}
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extern NS_COM nsresult
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NS_NewArrayEnumerator(nsISimpleEnumerator* *result,
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nsIArray* array)
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{
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nsSimpleArrayEnumerator* enumer = new nsSimpleArrayEnumerator(array);
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if (enumer == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*result = enumer);
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// enumerator implementation for nsCOMArray
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// creates a snapshot of the array in question
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// you MUST use NS_NewArrayEnumerator to create this, so that
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// allocation is done correctly
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class nsCOMArrayEnumerator : public nsISimpleEnumerator
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{
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public:
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// nsISupports interface
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NS_DECL_ISUPPORTS
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// nsISimpleEnumerator interface
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NS_DECL_NSISIMPLEENUMERATOR
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// nsSimpleArrayEnumerator methods
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nsCOMArrayEnumerator() : mIndex(0) {
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}
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// specialized operator to make sure we make room for mValues
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void* operator new (size_t size, const nsCOMArray_base& aArray) CPP_THROW_NEW;
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void operator delete(void* ptr) {
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::operator delete(ptr);
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}
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private:
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~nsCOMArrayEnumerator(void);
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protected:
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PRUint32 mIndex; // current position
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PRUint32 mArraySize; // size of the array
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// this is actually bigger
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nsISupports* mValueArray[1];
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};
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NS_IMPL_ISUPPORTS1(nsCOMArrayEnumerator, nsISimpleEnumerator)
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nsCOMArrayEnumerator::~nsCOMArrayEnumerator()
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{
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// only release the entries that we haven't visited yet
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for (; mIndex < mArraySize; ++mIndex) {
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NS_IF_RELEASE(mValueArray[mIndex]);
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}
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}
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NS_IMETHODIMP
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nsCOMArrayEnumerator::HasMoreElements(PRBool* aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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*aResult = (mIndex < mArraySize);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCOMArrayEnumerator::GetNext(nsISupports** aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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if (mIndex >= mArraySize)
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return NS_ERROR_UNEXPECTED;
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// pass the ownership of the reference to the caller. Since
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// we AddRef'ed during creation of |this|, there is no need
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// to AddRef here
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*aResult = mValueArray[mIndex++];
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// this really isn't necessary. just pretend this happens, since
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// we'll never visit this value again!
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// mValueArray[(mIndex-1)] = nsnull;
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return NS_OK;
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}
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void*
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nsCOMArrayEnumerator::operator new (size_t size, const nsCOMArray_base& aArray)
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CPP_THROW_NEW
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{
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// create enough space such that mValueArray points to a large
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// enough value. Note that the initial value of size gives us
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// space for mValueArray[0], so we must subtract
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size += (aArray.Count() - 1) * sizeof(aArray[0]);
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// do the actual allocation
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nsCOMArrayEnumerator * result =
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NS_STATIC_CAST(nsCOMArrayEnumerator*, ::operator new(size));
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// now need to copy over the values, and addref each one
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// now this might seem like alot of work, but we're actually just
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// doing all our AddRef's ahead of time since GetNext() doesn't
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// need to AddRef() on the way out
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PRUint32 i;
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PRUint32 max = result->mArraySize = aArray.Count();
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for (i = 0; i<max; i++) {
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result->mValueArray[i] = aArray[i];
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NS_IF_ADDREF(result->mValueArray[i]);
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}
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return result;
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}
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extern NS_COM nsresult
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NS_NewArrayEnumerator(nsISimpleEnumerator* *aResult,
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const nsCOMArray_base& aArray)
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{
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nsCOMArrayEnumerator *enumerator = new (aArray) nsCOMArrayEnumerator();
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if (!enumerator) return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aResult = enumerator);
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return NS_OK;
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}
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