98d049a586
Signed-off-by: Deokgyu Yang <secugyu@gmail.com> Change-Id: Ib3ab311d789ac286e7c7bd6725e478202b608bec
96 lines
4 KiB
C++
96 lines
4 KiB
C++
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* * Neither the name of The Linux Foundation, nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
|
|
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
#ifndef __LOC_HEAP__
|
|
#define __LOC_HEAP__
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
|
|
// abstract class to be implemented by client to provide a rankable class
|
|
class LocRankable {
|
|
public:
|
|
virtual inline ~LocRankable() {}
|
|
|
|
// method to rank objects of such type for sorting purposes.
|
|
// The pointer of the input node would be stored in the heap.
|
|
// >0 if ranks higher than the input;
|
|
// ==0 if equally ranks with the input;
|
|
// <0 if ranks lower than the input
|
|
virtual int ranks(LocRankable& rankable) = 0;
|
|
|
|
// convenient method to rank objects of such type for sorting purposes.
|
|
inline bool outRanks(LocRankable& rankable) { return ranks(rankable) > 0; }
|
|
};
|
|
|
|
// opaque class to provide service implementation.
|
|
class LocHeapNode;
|
|
|
|
// a heap whose left and right children are not sorted. It is sorted only vertically,
|
|
// i.e. parent always ranks higher than children, if they exist. Ranking algorithm is
|
|
// implemented in Rankable. The reason that there is no sort between children is to
|
|
// help beter balance the tree with lower cost. When a node is pushed to the tree,
|
|
// it is guaranteed that the subtree that is smaller gets to have the new node.
|
|
class LocHeap {
|
|
protected:
|
|
LocHeapNode* mTree;
|
|
public:
|
|
inline LocHeap() : mTree(NULL) {}
|
|
~LocHeap();
|
|
|
|
// push keeps the tree sorted by rank, it also tries to balance the
|
|
// tree by adding the new node to the smaller of the subtrees.
|
|
// node is reference to an obj that is managed by client, that client
|
|
// creates and destroyes. The destroy should happen after the
|
|
// node is popped out from the heap.
|
|
void push(LocRankable& node);
|
|
|
|
// Peeks the node data on tree top, which has currently the highest ranking
|
|
// There is no change the tree structure with this operation
|
|
// Returns NULL if the tree is empty, otherwise pointer to the node data of
|
|
// the tree top.
|
|
LocRankable* peek();
|
|
|
|
// pop keeps the tree sorted by rank, but it does not try to balance
|
|
// the tree.
|
|
// Return - pointer to the node popped out, or NULL if heap is already empty
|
|
LocRankable* pop();
|
|
|
|
// navigating through the tree and find the node that ranks the same
|
|
// as the input data, then remove it from the tree. Rank is implemented
|
|
// by rankable obj.
|
|
// returns the pointer to the node removed; or NULL (if failed).
|
|
LocRankable* remove(LocRankable& rankable);
|
|
|
|
#ifdef __LOC_UNIT_TEST__
|
|
bool checkTree();
|
|
uint32_t getTreeSize();
|
|
#endif
|
|
};
|
|
|
|
#endif //__LOC_HEAP__
|