mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 08:35:26 +00:00
423 lines
9.8 KiB
C++
423 lines
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* 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 Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
/**
|
|
* MODULE NOTES:
|
|
* @update gess 4/15/98 (tax day)
|
|
*
|
|
* The Deque is a very small, very efficient container object
|
|
* than can hold elements of type void*, offering the following features:
|
|
* It's interface supports pushing and poping of children.
|
|
* It can iterate (via an interator class) it's children.
|
|
* When full, it can efficently resize dynamically.
|
|
*
|
|
*
|
|
* NOTE: The only bit of trickery here is that this deque is
|
|
* built upon a ring-buffer. Like all ring buffers, the first
|
|
* element may not be at index[0]. The mOrigin member determines
|
|
* where the first child is. This point is quietly hidden from
|
|
* customers of this class.
|
|
*
|
|
*/
|
|
|
|
|
|
#ifndef _NSDEQUE
|
|
#define _NSDEQUE
|
|
|
|
#include "nscore.h"
|
|
|
|
/**
|
|
* The nsDequefunctor class is used when you want to create
|
|
* callbacks between the deque and your generic code.
|
|
* Use these objects in a call to ForEach();
|
|
*
|
|
* @update gess4/20/98
|
|
*/
|
|
class NS_COM nsDequeFunctor{
|
|
public:
|
|
virtual void* operator()(void* anObject)=0;
|
|
};
|
|
|
|
|
|
/******************************************************
|
|
* Here comes the nsDeque class itself...
|
|
******************************************************/
|
|
|
|
/**
|
|
* The deque (double-ended queue) class is a common container type,
|
|
* whose behavior mimics a line in your favorite checkout stand.
|
|
* Classic CS describes the common behavior of a queue as FIFO.
|
|
* A Deque allows items to be added and removed from either end of
|
|
* the queue.
|
|
*
|
|
* @update gess4/20/98
|
|
*/
|
|
|
|
class NS_COM nsDeque {
|
|
friend class nsDequeIterator;
|
|
public:
|
|
nsDeque(nsDequeFunctor* aDeallocator);
|
|
~nsDeque();
|
|
|
|
/**
|
|
* Returns the number of elements currently stored in
|
|
* this deque.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return int contains element count
|
|
*/
|
|
inline PRInt32 GetSize() const { return mSize;}
|
|
|
|
/**
|
|
* Pushes new member onto the end of the deque
|
|
*
|
|
* @update gess4/18/98
|
|
* @param ptr to object to store
|
|
* @return *this
|
|
*/
|
|
nsDeque& Push(void* anItem);
|
|
|
|
/**
|
|
* Pushes new member onto the front of the deque
|
|
*
|
|
* @update gess4/18/98
|
|
* @param ptr to object to store
|
|
* @return *this
|
|
*/
|
|
nsDeque& PushFront(void* anItem);
|
|
|
|
/**
|
|
* Remove and return the first item in the container.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param none
|
|
* @return ptr to first item in container
|
|
*/
|
|
void* Pop(void);
|
|
|
|
/**
|
|
* Remove and return the first item in the container.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param none
|
|
* @return ptr to first item in container
|
|
*/
|
|
void* PopFront(void);
|
|
|
|
/**
|
|
* Return bottom item without removing it.
|
|
*
|
|
* @update sford11/25/99
|
|
* @param none
|
|
* @return ptr to first item in container
|
|
*/
|
|
|
|
void* Peek(void);
|
|
/**
|
|
* Return topmost item without removing it.
|
|
*
|
|
* @update sford 11/25/99
|
|
* @param none
|
|
* @return ptr to first item in container
|
|
*/
|
|
void* PeekFront(void);
|
|
|
|
/**
|
|
* method used to retrieve ptr to
|
|
* ith member in container. DOesn't remove
|
|
* that item.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param index of desired item
|
|
* @return ptr to ith element in list
|
|
*/
|
|
void* ObjectAt(int anIndex) const;
|
|
|
|
/**
|
|
* Remove all items from container without destroying them
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
nsDeque& Empty();
|
|
|
|
/**
|
|
* Remove and delete all items from container
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
nsDeque& Erase();
|
|
|
|
|
|
/**
|
|
* Creates a new iterator, init'ed to start of container
|
|
*
|
|
* @update gess4/18/98
|
|
* @return new dequeIterator
|
|
*/
|
|
nsDequeIterator Begin() const;
|
|
|
|
/**
|
|
* Creates a new iterator, init'ed to end of container
|
|
*
|
|
* @update gess4/18/98
|
|
* @return new dequeIterator
|
|
*/
|
|
nsDequeIterator End() const;
|
|
|
|
|
|
/**
|
|
* Call this method when you wanto to iterate all the
|
|
* members of the container, passing a functor along
|
|
* to call your code.
|
|
*
|
|
* @update gess4/20/98
|
|
* @param aFunctor object to call for each member
|
|
* @return *this
|
|
*/
|
|
void ForEach(nsDequeFunctor& aFunctor) const;
|
|
|
|
/**
|
|
* Call this method when you wanto to iterate all the
|
|
* members of the container, passing a functor along
|
|
* to call your code. This process will interupt if
|
|
* your function returns a null to this iterator.
|
|
*
|
|
* @update gess4/20/98
|
|
* @param aFunctor object to call for each member
|
|
* @return *this
|
|
*/
|
|
const void* FirstThat(nsDequeFunctor& aFunctor) const;
|
|
|
|
void SetDeallocator(nsDequeFunctor* aDeallocator);
|
|
|
|
/**
|
|
* Perform automated selftest on the deque
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
static void SelfTest();
|
|
|
|
protected:
|
|
|
|
PRInt32 mSize;
|
|
PRInt32 mCapacity;
|
|
PRInt32 mOrigin;
|
|
nsDequeFunctor* mDeallocator;
|
|
void* mBuffer[8];
|
|
void** mData;
|
|
|
|
|
|
private:
|
|
|
|
|
|
/**
|
|
* Simple default constructor (PRIVATE)
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
nsDeque();
|
|
|
|
/**
|
|
* Copy constructor (PRIVATE)
|
|
*
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
nsDeque(const nsDeque& other);
|
|
|
|
/**
|
|
* Deque assignment operator (PRIVATE)
|
|
*
|
|
* @update gess4/18/98
|
|
* @param another deque
|
|
* @return *this
|
|
*/
|
|
nsDeque& operator=(const nsDeque& anOther);
|
|
|
|
nsDeque& GrowCapacity(void);
|
|
|
|
};
|
|
|
|
/******************************************************
|
|
* Here comes the nsDequeIterator class...
|
|
******************************************************/
|
|
|
|
class NS_COM nsDequeIterator {
|
|
public:
|
|
|
|
/**
|
|
* DequeIterator is an object that knows how to iterate (forward and backward)
|
|
* a Deque. Normally, you don't need to do this, but there are some special
|
|
* cases where it is pretty handy, so here you go.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param aQueue is the deque object to be iterated
|
|
* @param anIndex is the starting position for your iteration
|
|
*/
|
|
nsDequeIterator(const nsDeque& aQueue,int anIndex=0);
|
|
|
|
/**
|
|
* DequeIterator is an object that knows how to iterate (forward and backward)
|
|
* a Deque. Normally, you don't need to do this, but there are some special
|
|
* cases where it is pretty handy, so here you go.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param aQueue is the deque object to be iterated
|
|
* @param anIndex is the starting position for your iteration
|
|
*/
|
|
nsDequeIterator(const nsDequeIterator& aCopy);
|
|
|
|
/**
|
|
* Moves iterator to first element in deque
|
|
* @update gess4/18/98
|
|
* @return this
|
|
*/
|
|
nsDequeIterator& First(void);
|
|
|
|
/**
|
|
* Standard assignment operator for deque
|
|
* @update gess4/18/98
|
|
* @param
|
|
* @return
|
|
*/
|
|
nsDequeIterator& operator=(const nsDequeIterator& aCopy);
|
|
|
|
/**
|
|
* preform ! operation against to iterators to test for equivalence
|
|
* (or lack thereof)!
|
|
*
|
|
* @update gess4/18/98
|
|
* @param anIter is the object to be compared to
|
|
* @return TRUE if NOT equal.
|
|
*/
|
|
PRBool operator!=(nsDequeIterator& anIter);
|
|
|
|
/**
|
|
* Compare 2 iterators for equivalence.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param anIter is the other iterator to be compared to
|
|
* @return TRUE if EQUAL
|
|
*/
|
|
PRBool operator<(nsDequeIterator& anIter);
|
|
|
|
/**
|
|
* Compare 2 iterators for equivalence.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param anIter is the other iterator to be compared to
|
|
* @return TRUE if EQUAL
|
|
*/
|
|
PRBool operator==(nsDequeIterator& anIter);
|
|
|
|
/**
|
|
* Compare 2 iterators for equivalence.
|
|
*
|
|
* @update gess4/18/98
|
|
* @param anIter is the other iterator to be compared to
|
|
* @return TRUE if EQUAL
|
|
*/
|
|
PRBool operator>=(nsDequeIterator& anIter);
|
|
|
|
/**
|
|
* Pre-increment operator
|
|
*
|
|
* @update gess4/18/98
|
|
* @return object at preincremented index
|
|
*/
|
|
void* operator++();
|
|
|
|
/**
|
|
* Post-increment operator
|
|
*
|
|
* @update gess4/18/98
|
|
* @param param is ignored
|
|
* @return object at post-incremented index
|
|
*/
|
|
void* operator++(int);
|
|
|
|
/**
|
|
* Pre-decrement operator
|
|
*
|
|
* @update gess4/18/98
|
|
* @return object at pre-decremented index
|
|
*/
|
|
void* operator--();
|
|
|
|
/**
|
|
* Post-decrement operator
|
|
*
|
|
* @update gess4/18/98
|
|
* @param param is ignored
|
|
* @return object at post-decremented index
|
|
*/
|
|
void* operator--(int);
|
|
|
|
/**
|
|
* Retrieve the ptr to the iterators notion of current node
|
|
*
|
|
* @update gess4/18/98
|
|
* @return object at ith index
|
|
*/
|
|
void* GetCurrent(void);
|
|
|
|
/**
|
|
* Call this method when you wanto to iterate all the
|
|
* members of the container, passing a functor along
|
|
* to call your code.
|
|
*
|
|
* @update gess4/20/98
|
|
* @param aFunctor object to call for each member
|
|
* @return *this
|
|
*/
|
|
void ForEach(nsDequeFunctor& aFunctor) const;
|
|
|
|
/**
|
|
* Call this method when you wanto to iterate all the
|
|
* members of the container, passing a functor along
|
|
* to call your code.
|
|
*
|
|
* @update gess4/20/98
|
|
* @param aFunctor object to call for each member
|
|
* @return *this
|
|
*/
|
|
const void* FirstThat(nsDequeFunctor& aFunctor) const;
|
|
|
|
protected:
|
|
|
|
PRInt32 mIndex;
|
|
const nsDeque& mDeque;
|
|
};
|
|
|
|
|
|
#endif
|