gecko-dev/layout/base/nsLayoutHistoryState.cpp

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/* -*- 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):
* Pierre Phaneuf <pp@ludusdesign.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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsILayoutHistoryState.h"
#include "nsWeakReference.h"
#include "nsHashtable.h"
class nsLayoutHistoryState : public nsILayoutHistoryState,
public nsSupportsWeakReference
{
public:
nsLayoutHistoryState();
virtual ~nsLayoutHistoryState();
NS_DECL_ISUPPORTS
// nsILayoutHistoryState
NS_IMETHOD AddState(const nsCString& aKey, nsIPresState* aState);
NS_IMETHOD GetState(const nsCString& aKey, nsIPresState** aState);
NS_IMETHOD RemoveState(const nsCString& aKey);
private:
nsSupportsHashtable mStates;
};
nsresult
NS_NewLayoutHistoryState(nsILayoutHistoryState** aState)
{
NS_ENSURE_ARG_POINTER(aState);
if (! aState)
return NS_ERROR_NULL_POINTER;
nsLayoutHistoryState *state = new nsLayoutHistoryState();
if (!state)
return NS_ERROR_OUT_OF_MEMORY;
*aState = NS_STATIC_CAST(nsILayoutHistoryState *, state);
NS_ADDREF(*aState);
return NS_OK;
}
nsLayoutHistoryState::nsLayoutHistoryState()
{
NS_INIT_REFCNT();
}
nsLayoutHistoryState::~nsLayoutHistoryState()
{
}
NS_IMPL_ISUPPORTS2(nsLayoutHistoryState,
nsILayoutHistoryState,
nsISupportsWeakReference);
NS_IMETHODIMP
nsLayoutHistoryState::AddState(const nsCString& aStateKey,
nsIPresState* aState)
{
nsCStringKey key(aStateKey);
/*
* nsSupportsHashtable::Put() returns false when no object was
* replaced when inserting the new one, true if one was.
*/
#ifdef DEBUG_pollmann
PRBool replaced =
#endif
mStates.Put (&key, aState);
#ifdef DEBUG_pollmann
NS_ASSERTION(!replaced,
"nsLayoutHistoryState::AddState OOPS!. There was already a state in the hash table for the key\n");
#endif
return NS_OK;
}
NS_IMETHODIMP
nsLayoutHistoryState::GetState(const nsCString& aKey,
nsIPresState** aState)
{
nsresult rv = NS_OK;
nsCStringKey key(aKey);
nsISupports *state = nsnull;
state = mStates.Get(&key);
if (state) {
*aState = (nsIPresState *)state;
}
else {
#if 0
printf("nsLayoutHistoryState::GetState, ERROR getting History state for the key\n");
#endif
*aState = nsnull;
rv = NS_OK;
}
return rv;
}
NS_IMETHODIMP
nsLayoutHistoryState::RemoveState(const nsCString& aKey)
{
nsresult rv = NS_OK;
nsCStringKey key(aKey);
mStates.Remove(&key);
return rv;
}