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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "list_wrapper.h"
#include "critical_section_wrapper.h"
#include "trace.h"
namespace webrtc {
ListItem::ListItem(const void* item)
: next_(0),
prev_(0),
item_ptr_(item),
item_(0)
{
}
ListItem::ListItem(const unsigned int item)
: next_(0),
prev_(0),
item_ptr_(0),
item_(item)
{
}
ListItem::~ListItem()
{
}
void* ListItem::GetItem() const
{
return const_cast<void*>(item_ptr_);
}
unsigned int ListItem::GetUnsignedItem() const
{
return item_;
}
ListWrapper::ListWrapper()
: critical_section_(CriticalSectionWrapper::CreateCriticalSection()),
first_(0),
last_(0),
size_(0)
{
}
ListWrapper::~ListWrapper()
{
if (!Empty())
{
// TODO (hellner) I'm not sure this loggin is useful.
WEBRTC_TRACE(kTraceMemory, kTraceUtility, -1,
"Potential memory leak in ListWrapper");
// Remove all remaining list items.
while (Erase(First()) == 0)
{}
}
delete critical_section_;
}
bool ListWrapper::Empty() const
{
return !first_ && !last_;
}
unsigned int ListWrapper::GetSize() const
{
return size_;
}
int ListWrapper::PushBack(const void* ptr)
{
ListItem* item = new ListItem(ptr);
CriticalSectionScoped lock(*critical_section_);
PushBackImpl(item);
return 0;
}
int ListWrapper::PushBack(const unsigned int item_id)
{
ListItem* item = new ListItem(item_id);
CriticalSectionScoped lock(*critical_section_);
PushBackImpl(item);
return 0;
}
int ListWrapper::PushFront(const unsigned int item_id)
{
ListItem* item = new ListItem(item_id);
CriticalSectionScoped lock(*critical_section_);
PushFrontImpl(item);
return 0;
}
int ListWrapper::PushFront(const void* ptr)
{
ListItem* item = new ListItem(ptr);
CriticalSectionScoped lock(*critical_section_);
PushFrontImpl(item);
return 0;
}
int ListWrapper::PopFront()
{
return Erase(first_);
}
int ListWrapper::PopBack()
{
return Erase(last_);
}
ListItem* ListWrapper::First() const
{
return first_;
}
ListItem* ListWrapper::Last() const
{
return last_;
}
ListItem* ListWrapper::Next(ListItem* item) const
{
if(!item)
{
return 0;
}
return item->next_;
}
ListItem* ListWrapper::Previous(ListItem* item) const
{
if (!item)
{
return 0;
}
return item->prev_;
}
int ListWrapper::Insert(ListItem* existing_previous_item, ListItem* new_item)
{
if (!new_item)
{
return -1;
}
// Allow existing_previous_item to be NULL if the list is empty.
// TODO (hellner) why allow this? Keep it as is for now to avoid
// breaking API contract.
if (!existing_previous_item && !Empty())
{
return -1;
}
CriticalSectionScoped lock(*critical_section_);
if (!existing_previous_item)
{
PushBackImpl(new_item);
return 0;
}
ListItem* next_item = existing_previous_item->next_;
new_item->next_ = existing_previous_item->next_;
new_item->prev_ = existing_previous_item;
existing_previous_item->next_ = new_item;
if (next_item)
{
next_item->prev_ = new_item;
}
else
{
last_ = new_item;
}
size_++;
return 0;
}
int ListWrapper::InsertBefore(ListItem* existing_next_item,
ListItem* new_item)
{
if (!new_item)
{
return -1;
}
// Allow existing_next_item to be NULL if the list is empty.
// Todo: why allow this? Keep it as is for now to avoid breaking API
// contract.
if (!existing_next_item && !Empty())
{
return -1;
}
CriticalSectionScoped lock(*critical_section_);
if (!existing_next_item)
{
PushBackImpl(new_item);
return 0;
}
ListItem* previous_item = existing_next_item->prev_;
new_item->next_ = existing_next_item;
new_item->prev_ = previous_item;
existing_next_item->prev_ = new_item;
if (previous_item)
{
previous_item->next_ = new_item;
}
else
{
first_ = new_item;
}
size_++;
return 0;
}
int ListWrapper::Erase(ListItem* item)
{
if (!item)
{
return -1;
}
size_--;
ListItem* previous_item = item->prev_;
ListItem* next_item = item->next_;
if (!previous_item)
{
if(next_item)
{
next_item->prev_ = 0;
}
first_ = next_item;
}
else
{
previous_item->next_ = next_item;
}
if (!next_item)
{
if(previous_item)
{
previous_item->next_ = 0;
}
last_ = previous_item;
}
else
{
next_item->prev_ = previous_item;
}
delete item;
return 0;
}
void ListWrapper::PushBackImpl(ListItem* item)
{
if (Empty())
{
first_ = item;
last_ = item;
size_++;
return;
}
item->prev_ = last_;
last_->next_ = item;
last_ = item;
size_++;
}
void ListWrapper::PushFrontImpl(ListItem* item)
{
if (Empty())
{
first_ = item;
last_ = item;
size_++;
return;
}
item->next_ = first_;
first_->prev_ = item;
first_ = item;
size_++;
}
} //namespace webrtc
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