gecko-dev/xpcom/ds/nsEnumeratorUtils.cpp

258 строки
6.5 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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
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* 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
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*
* ***** END LICENSE BLOCK ***** */
#include "nsEnumeratorUtils.h"
nsArrayEnumerator::nsArrayEnumerator(nsISupportsArray* aValueArray)
: mValueArray(aValueArray),
mIndex(0)
{
NS_INIT_REFCNT();
NS_IF_ADDREF(mValueArray);
}
nsArrayEnumerator::~nsArrayEnumerator(void)
{
NS_IF_RELEASE(mValueArray);
}
NS_IMPL_ISUPPORTS1(nsArrayEnumerator, nsISimpleEnumerator)
NS_IMETHODIMP
nsArrayEnumerator::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->Count(&cnt);
if (NS_FAILED(rv)) return rv;
*aResult = (mIndex < (PRInt32) cnt);
return NS_OK;
}
NS_IMETHODIMP
nsArrayEnumerator::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->Count(&cnt);
if (NS_FAILED(rv)) return rv;
if (mIndex >= (PRInt32) cnt)
return NS_ERROR_UNEXPECTED;
*aResult = mValueArray->ElementAt(mIndex++);
return NS_OK;
}
extern "C" NS_COM nsresult
NS_NewArrayEnumerator(nsISimpleEnumerator* *result,
nsISupportsArray* array)
{
nsArrayEnumerator* enumer = new nsArrayEnumerator(array);
if (enumer == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(enumer);
*result = enumer;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
nsSingletonEnumerator::nsSingletonEnumerator(nsISupports* aValue)
: mValue(aValue)
{
NS_INIT_REFCNT();
NS_IF_ADDREF(mValue);
mConsumed = (mValue ? PR_FALSE : PR_TRUE);
}
nsSingletonEnumerator::~nsSingletonEnumerator()
{
NS_IF_RELEASE(mValue);
}
NS_IMPL_ISUPPORTS1(nsSingletonEnumerator, nsISimpleEnumerator)
NS_IMETHODIMP
nsSingletonEnumerator::HasMoreElements(PRBool* aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
*aResult = !mConsumed;
return NS_OK;
}
NS_IMETHODIMP
nsSingletonEnumerator::GetNext(nsISupports** aResult)
{
NS_PRECONDITION(aResult != 0, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
if (mConsumed)
return NS_ERROR_UNEXPECTED;
mConsumed = PR_TRUE;
NS_ADDREF(mValue);
*aResult = mValue;
return NS_OK;
}
extern "C" NS_COM nsresult
NS_NewSingletonEnumerator(nsISimpleEnumerator* *result,
nsISupports* singleton)
{
nsSingletonEnumerator* enumer = new nsSingletonEnumerator(singleton);
if (enumer == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(enumer);
*result = enumer;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////
nsAdapterEnumerator::nsAdapterEnumerator(nsIEnumerator* aEnum)
: mEnum(aEnum), mCurrent(0), mStarted(PR_FALSE)
{
NS_INIT_REFCNT();
NS_ADDREF(mEnum);
}
nsAdapterEnumerator::~nsAdapterEnumerator()
{
NS_RELEASE(mEnum);
NS_IF_RELEASE(mCurrent);
}
NS_IMPL_ISUPPORTS1(nsAdapterEnumerator, nsISimpleEnumerator)
NS_IMETHODIMP
nsAdapterEnumerator::HasMoreElements(PRBool* aResult)
{
nsresult rv;
if (mCurrent) {
*aResult = PR_TRUE;
return NS_OK;
}
if (! mStarted) {
mStarted = PR_TRUE;
rv = mEnum->First();
if (rv == NS_OK) {
mEnum->CurrentItem(&mCurrent);
*aResult = PR_TRUE;
}
else {
*aResult = PR_FALSE;
}
}
else {
*aResult = PR_FALSE;
rv = mEnum->IsDone();
if (rv != NS_OK) {
// We're not done. Advance to the next one.
rv = mEnum->Next();
if (rv == NS_OK) {
mEnum->CurrentItem(&mCurrent);
*aResult = PR_TRUE;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsAdapterEnumerator::GetNext(nsISupports** aResult)
{
nsresult rv;
PRBool hasMore;
rv = HasMoreElements(&hasMore);
if (NS_FAILED(rv)) return rv;
if (! hasMore)
return NS_ERROR_UNEXPECTED;
// No need to addref, we "transfer" the ownership to the caller.
*aResult = mCurrent;
mCurrent = 0;
return NS_OK;
}
extern "C" NS_COM nsresult
NS_NewAdapterEnumerator(nsISimpleEnumerator* *result,
nsIEnumerator* enumerator)
{
nsAdapterEnumerator* enumer = new nsAdapterEnumerator(enumerator);
if (enumer == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(enumer);
*result = enumer;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////