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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 XPCOM Array implementation.
*
* The Initial Developer of the Original Code
* Netscape Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alec Flett <alecf@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsArrayEnumerator.h"
NS_IMPL_ISUPPORTS1(nsSimpleArrayEnumerator, nsISimpleEnumerator)
NS_IMETHODIMP
nsSimpleArrayEnumerator::HasMoreElements(PRBool* aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
if (!mValueArray) {
*aResult = PR_FALSE;
return NS_OK;
}
PRUint32 cnt;
nsresult rv = mValueArray->GetLength(&cnt);
if (NS_FAILED(rv)) return rv;
*aResult = (mIndex < cnt);
return NS_OK;
}
NS_IMETHODIMP
nsSimpleArrayEnumerator::GetNext(nsISupports** aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
if (!mValueArray) {
*aResult = nsnull;
return NS_OK;
}
PRUint32 cnt;
nsresult rv = mValueArray->GetLength(&cnt);
if (NS_FAILED(rv)) return rv;
if (mIndex >= cnt)
return NS_ERROR_UNEXPECTED;
return mValueArray->QueryElementAt(mIndex++, NS_GET_IID(nsISupports), (void**)aResult);
}
extern NS_COM nsresult
NS_NewArrayEnumerator(nsISimpleEnumerator* *result,
nsIArray* array)
{
nsSimpleArrayEnumerator* enumer = new nsSimpleArrayEnumerator(array);
if (enumer == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = enumer);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// enumerator implementation for nsCOMArray
// creates a snapshot of the array in question
// you MUST use NS_NewArrayEnumerator to create this, so that
// allocation is done correctly
class nsCOMArrayEnumerator : public nsISimpleEnumerator
{
public:
// nsISupports interface
NS_DECL_ISUPPORTS
// nsISimpleEnumerator interface
NS_DECL_NSISIMPLEENUMERATOR
// nsSimpleArrayEnumerator methods
nsCOMArrayEnumerator() : mIndex(0) {
}
// specialized operator to make sure we make room for mValues
void* operator new (size_t size, const nsCOMArray_base& aArray) CPP_THROW_NEW;
void operator delete(void* ptr) {
::operator delete(ptr);
}
private:
~nsCOMArrayEnumerator(void);
protected:
PRUint32 mIndex; // current position
PRUint32 mArraySize; // size of the array
// this is actually bigger
nsISupports* mValueArray[1];
};
NS_IMPL_ISUPPORTS1(nsCOMArrayEnumerator, nsISimpleEnumerator)
nsCOMArrayEnumerator::~nsCOMArrayEnumerator()
{
// only release the entries that we haven't visited yet
for (; mIndex < mArraySize; ++mIndex) {
NS_IF_RELEASE(mValueArray[mIndex]);
}
}
NS_IMETHODIMP
nsCOMArrayEnumerator::HasMoreElements(PRBool* aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
*aResult = (mIndex < mArraySize);
return NS_OK;
}
NS_IMETHODIMP
nsCOMArrayEnumerator::GetNext(nsISupports** aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
if (mIndex >= mArraySize)
return NS_ERROR_UNEXPECTED;
// pass the ownership of the reference to the caller. Since
// we AddRef'ed during creation of |this|, there is no need
// to AddRef here
*aResult = mValueArray[mIndex++];
// this really isn't necessary. just pretend this happens, since
// we'll never visit this value again!
// mValueArray[(mIndex-1)] = nsnull;
return NS_OK;
}
void*
nsCOMArrayEnumerator::operator new (size_t size, const nsCOMArray_base& aArray)
CPP_THROW_NEW
{
// create enough space such that mValueArray points to a large
// enough value. Note that the initial value of size gives us
// space for mValueArray[0], so we must subtract
size += (aArray.Count() - 1) * sizeof(aArray[0]);
// do the actual allocation
nsCOMArrayEnumerator * result =
NS_STATIC_CAST(nsCOMArrayEnumerator*, ::operator new(size));
// now need to copy over the values, and addref each one
// now this might seem like alot of work, but we're actually just
// doing all our AddRef's ahead of time since GetNext() doesn't
// need to AddRef() on the way out
PRUint32 i;
PRUint32 max = result->mArraySize = aArray.Count();
for (i = 0; i<max; i++) {
result->mValueArray[i] = aArray[i];
NS_IF_ADDREF(result->mValueArray[i]);
}
return result;
}
extern NS_COM nsresult
NS_NewArrayEnumerator(nsISimpleEnumerator* *aResult,
const nsCOMArray_base& aArray)
{
nsCOMArrayEnumerator *enumerator = new (aArray) nsCOMArrayEnumerator();
if (!enumerator) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult = enumerator);
return NS_OK;
}
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