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// Copyright (C) 2014 Michael Biggs. See the COPYING file at the top-level
// directory of this distribution and at http://shok.io/code/copyright.html
#ifndef _statik_Batch_h_
#define _statik_Batch_h_
/* A batch of List node changes (insertions/updates/deletions). This is the
* output emit by an IncParser, describing the changes to the output list. You
* can also provide a batch of input changes to an IncParser; e.g. to drive one
* IncParser from the ChangeBatch emit by another.
*
* The batch is ordered; the first item (change) should be applied before the
* subsequent. The nodes are wired (left/right pointers are set) as if they
* were connected as a part of the list as it exists when their change would be
* applied. However, of course, their neighbours' left/right pointers will
* reflect the old state of the list.
*/
#include "List.h"
#include <ostream>
#include <set>
#include <string>
#include <utility>
#include <vector>
namespace statik {
class Batch {
public:
enum BATCH_OP {
OP_INSERT,
OP_UPDATE,
OP_DELETE
};
static std::string UnMapBatchOp(const BATCH_OP& op);
struct BatchItem {
BatchItem(const List& node, BATCH_OP op, const List* pos = NULL)
: node(&node), op(op), pos(pos) {}
const List* node;
BATCH_OP op;
const List* pos;
std::string Print() const;
};
typedef std::vector<BatchItem> batch_vec;
typedef batch_vec::const_iterator batch_iter;
batch_iter begin() const { return m_batch.begin(); }
batch_iter end() const { return m_batch.end(); }
size_t Size() const { return m_batch.size(); }
bool IsEmpty() const { return m_batch.empty(); }
void Insert(const List& inode, const List* pos);
void Update(const List& inode);
void Delete(const List& inode);
void Accept(const Batch& batch);
void Clear();
std::string Print() const;
private:
batch_vec m_batch;
};
std::ostream& operator<< (std::ostream& out, const Batch::BatchItem& item);
std::ostream& operator<< (std::ostream& out, const Batch& batch);
}
#endif // _statik_Batch_h_
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