зеркало из https://github.com/mozilla/pjs.git
310 строки
7.9 KiB
C++
310 строки
7.9 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 mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Benjamin Smedberg <benjamin@smedbergs.us>
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*
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* Code moved from nsEmptyEnumerator.cpp:
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* L. David Baron <dbaron@dbaron.org>
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* Pierre Phaneuf <pp@ludusdesign.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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 "mozilla/Attributes.h"
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#include "nsEnumeratorUtils.h"
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#include "nsISimpleEnumerator.h"
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#include "nsIStringEnumerator.h"
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#include "nsCOMPtr.h"
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class EmptyEnumeratorImpl : public nsISimpleEnumerator,
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public nsIUTF8StringEnumerator,
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public nsIStringEnumerator
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{
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public:
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EmptyEnumeratorImpl() {}
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// nsISupports interface
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NS_DECL_ISUPPORTS_INHERITED // not really inherited, but no mRefCnt
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// nsISimpleEnumerator
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NS_DECL_NSISIMPLEENUMERATOR
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NS_DECL_NSIUTF8STRINGENUMERATOR
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// can't use NS_DECL_NSISTRINGENUMERATOR because they share the
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// HasMore() signature
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NS_IMETHOD GetNext(nsAString& aResult);
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static EmptyEnumeratorImpl* GetInstance() {
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return const_cast<EmptyEnumeratorImpl*>(&kInstance);
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}
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private:
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static const EmptyEnumeratorImpl kInstance;
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};
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// nsISupports interface
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NS_IMETHODIMP_(nsrefcnt) EmptyEnumeratorImpl::AddRef(void)
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{
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return 2;
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}
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NS_IMETHODIMP_(nsrefcnt) EmptyEnumeratorImpl::Release(void)
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{
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return 1;
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}
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NS_IMPL_QUERY_INTERFACE3(EmptyEnumeratorImpl, nsISimpleEnumerator,
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nsIUTF8StringEnumerator, nsIStringEnumerator)
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// nsISimpleEnumerator interface
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NS_IMETHODIMP EmptyEnumeratorImpl::HasMoreElements(bool* aResult)
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{
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*aResult = false;
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return NS_OK;
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}
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NS_IMETHODIMP EmptyEnumeratorImpl::HasMore(bool* aResult)
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{
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*aResult = false;
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return NS_OK;
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}
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NS_IMETHODIMP EmptyEnumeratorImpl::GetNext(nsISupports** aResult)
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{
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return NS_ERROR_UNEXPECTED;
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}
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NS_IMETHODIMP EmptyEnumeratorImpl::GetNext(nsACString& aResult)
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{
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return NS_ERROR_UNEXPECTED;
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}
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NS_IMETHODIMP EmptyEnumeratorImpl::GetNext(nsAString& aResult)
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{
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return NS_ERROR_UNEXPECTED;
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}
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const EmptyEnumeratorImpl EmptyEnumeratorImpl::kInstance;
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nsresult
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NS_NewEmptyEnumerator(nsISimpleEnumerator** aResult)
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{
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*aResult = EmptyEnumeratorImpl::GetInstance();
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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class nsSingletonEnumerator MOZ_FINAL : public nsISimpleEnumerator
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{
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public:
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NS_DECL_ISUPPORTS
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// nsISimpleEnumerator methods
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NS_IMETHOD HasMoreElements(bool* aResult);
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NS_IMETHOD GetNext(nsISupports** aResult);
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nsSingletonEnumerator(nsISupports* aValue);
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private:
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~nsSingletonEnumerator();
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protected:
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nsISupports* mValue;
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bool mConsumed;
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};
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nsSingletonEnumerator::nsSingletonEnumerator(nsISupports* aValue)
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: mValue(aValue)
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{
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NS_IF_ADDREF(mValue);
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mConsumed = (mValue ? false : true);
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}
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nsSingletonEnumerator::~nsSingletonEnumerator()
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{
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NS_IF_RELEASE(mValue);
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}
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NS_IMPL_ISUPPORTS1(nsSingletonEnumerator, nsISimpleEnumerator)
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NS_IMETHODIMP
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nsSingletonEnumerator::HasMoreElements(bool* 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 = !mConsumed;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSingletonEnumerator::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 (mConsumed)
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return NS_ERROR_UNEXPECTED;
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mConsumed = true;
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*aResult = mValue;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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nsresult
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NS_NewSingletonEnumerator(nsISimpleEnumerator* *result,
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nsISupports* singleton)
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{
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nsSingletonEnumerator* enumer = new nsSingletonEnumerator(singleton);
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if (enumer == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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*result = enumer;
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NS_ADDREF(*result);
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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class nsUnionEnumerator : public nsISimpleEnumerator
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{
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public:
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NS_DECL_ISUPPORTS
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// nsISimpleEnumerator methods
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NS_IMETHOD HasMoreElements(bool* aResult);
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NS_IMETHOD GetNext(nsISupports** aResult);
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nsUnionEnumerator(nsISimpleEnumerator* firstEnumerator,
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nsISimpleEnumerator* secondEnumerator);
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private:
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~nsUnionEnumerator();
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protected:
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nsCOMPtr<nsISimpleEnumerator> mFirstEnumerator, mSecondEnumerator;
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bool mConsumed;
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bool mAtSecond;
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};
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nsUnionEnumerator::nsUnionEnumerator(nsISimpleEnumerator* firstEnumerator,
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nsISimpleEnumerator* secondEnumerator)
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: mFirstEnumerator(firstEnumerator),
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mSecondEnumerator(secondEnumerator),
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mConsumed(false), mAtSecond(false)
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{
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}
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nsUnionEnumerator::~nsUnionEnumerator()
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{
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}
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NS_IMPL_ISUPPORTS1(nsUnionEnumerator, nsISimpleEnumerator)
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NS_IMETHODIMP
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nsUnionEnumerator::HasMoreElements(bool* 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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nsresult rv;
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if (mConsumed) {
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*aResult = false;
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return NS_OK;
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}
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if (! mAtSecond) {
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rv = mFirstEnumerator->HasMoreElements(aResult);
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if (NS_FAILED(rv)) return rv;
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if (*aResult)
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return NS_OK;
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mAtSecond = true;
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}
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rv = mSecondEnumerator->HasMoreElements(aResult);
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if (NS_FAILED(rv)) return rv;
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if (*aResult)
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return NS_OK;
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*aResult = false;
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mConsumed = true;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsUnionEnumerator::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 (mConsumed)
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return NS_ERROR_UNEXPECTED;
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if (! mAtSecond)
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return mFirstEnumerator->GetNext(aResult);
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return mSecondEnumerator->GetNext(aResult);
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}
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nsresult
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NS_NewUnionEnumerator(nsISimpleEnumerator* *result,
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nsISimpleEnumerator* firstEnumerator,
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nsISimpleEnumerator* secondEnumerator)
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{
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*result = nsnull;
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if (! firstEnumerator) {
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*result = secondEnumerator;
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} else if (! secondEnumerator) {
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*result = firstEnumerator;
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} else {
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nsUnionEnumerator* enumer = new nsUnionEnumerator(firstEnumerator, secondEnumerator);
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if (enumer == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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*result = enumer;
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}
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NS_ADDREF(*result);
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return NS_OK;
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}
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