/*
 * Copyright (c) 2006, Haiku, Inc.
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *              Stephan Aßmus <superstippi@gmx.de>
 */

#include "RegionPool.h"

#include <new>
#include <stdio.h>

#if DEBUG_LEAK
#include <debugger.h>
#endif

#include <Region.h>

using std::nothrow;

RegionPool::RegionPool()
        : fAvailable(4)
#if DEBUG_LEAK
          ,fUsed(4)
#endif
{
}


RegionPool::~RegionPool()
{
#if DEBUG_LEAK
        if (fUsed.CountItems() > 0)
                debugger("RegionPool::~RegionPool() - some regions still in use!");
#endif
        int32 count = fAvailable.CountItems();
        for (int32 i = 0; i < count; i++)
                delete (BRegion*)fAvailable.ItemAtFast(i);
}


BRegion*
RegionPool::GetRegion()
{
        BRegion* region = (BRegion*)fAvailable.RemoveItem(
                fAvailable.CountItems() - 1);
        if (!region) {
                region = new (nothrow) BRegion();
                if (!region) {
                        // whoa
                        fprintf(stderr, "RegionPool::GetRegion() - "
                                                        "no memory!\n");
                }
        }
#if DEBUG_LEAK
        fUsed.AddItem(region);
#endif
        return region;
}


BRegion*
RegionPool::GetRegion(const BRegion& other)
{
        BRegion* region;
        int32 count = fAvailable.CountItems();
        if (count > 0) {
                region = (BRegion*)fAvailable.RemoveItem(count - 1);
                *region = other;
        } else {
                region = new (nothrow) BRegion(other);
                if (!region) {
                        // whoa
                        fprintf(stderr, "RegionPool::GetRegion() - "
                                                        "no memory!\n");
                }
        }

#if DEBUG_LEAK
        fUsed.AddItem(region);
#endif
        return region;
}


void
RegionPool::Recycle(BRegion* region)
{
        if (!fAvailable.AddItem(region)) {
                // at least don't leak the region...
                fprintf(stderr, "RegionPool::Recycle() - "
                                                "no memory!\n");
                delete region;
        } else {
                // prepare for next usage
                region->MakeEmpty();
        }
#if DEBUG_LEAK
        fUsed.RemoveItem(region);
#endif
}