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/* ***** 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 Mozilla IPC.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@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 ***** */
#ifndef ipcList_h__
#define ipcList_h__
#include "prtypes.h"
//-----------------------------------------------------------------------------
// simple list of singly-linked objects. class T must have the following
// structure:
//
// class T {
// ...
// public:
// T *mNext;
// };
//
// objects added to the list must be allocated with operator new. class T may
// optionally inherit from ipcListNode<T> if it doesn't wish to define mNext
// explicitly.
//-----------------------------------------------------------------------------
template<class T>
class ipcList
{
public:
ipcList()
: mHead(NULL)
, mTail(NULL)
{ }
~ipcList() { DeleteAll(); }
//
// prepends obj at the beginning of the list.
//
void Prepend(T *obj)
{
obj->mNext = mHead;
mHead = obj;
if (!mTail)
mTail = mHead;
}
//
// appends obj to the end of the list.
//
void Append(T *obj)
{
obj->mNext = NULL;
if (mTail) {
mTail->mNext = obj;
mTail = obj;
}
else
mTail = mHead = obj;
}
//
// inserts b into the list after a.
//
void InsertAfter(T *a, T *b)
{
b->mNext = a->mNext;
a->mNext = b;
if (mTail == a)
mTail = b;
}
//
// removes first element w/o deleting it
//
void RemoveFirst()
{
if (mHead)
AdvanceHead();
}
//
// removes element after the given element w/o deleting it
//
void RemoveAfter(T *obj)
{
T *rej = obj->mNext;
if (rej) {
obj->mNext = rej->mNext;
if (rej == mTail)
mTail = obj;
}
}
//
// deletes first element
//
void DeleteFirst()
{
T *first = mHead;
if (first) {
AdvanceHead();
delete first;
}
}
//
// deletes element after the given element
//
void DeleteAfter(T *obj)
{
T *rej = obj->mNext;
if (rej) {
RemoveAfter(obj);
delete rej;
}
}
//
// deletes all elements
//
void DeleteAll()
{
while (mHead)
DeleteFirst();
}
const T *First() const { return mHead; }
T *First() { return mHead; }
const T *Last() const { return mTail; }
T *Last() { return mTail; }
PRBool IsEmpty() const { return mHead == NULL; }
//
// moves contents of list to another list
//
void MoveTo(ipcList<T> &other)
{
other.mHead = mHead;
other.mTail = mTail;
mHead = NULL;
mTail = NULL;
}
// gets count of list elements
PRUint32 Count()
{
T *obj = mHead;
PRUint32 count = 0;
while (obj) {
count++;
obj = obj->mNext;
}
return count;
}
protected:
void AdvanceHead()
{
mHead = mHead->mNext;
if (!mHead)
mTail = NULL;
}
T *mHead;
T *mTail;
};
template<class T>
class ipcListNode
{
public:
ipcListNode() : mNext(nsnull) {}
T *mNext;
};
#endif // !ipcList_h__
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