/* Query - query parsing and evaluation
 *
 * Copyright 2001-2004, Axel Dörfler, axeld@pinc-software.de.
 * This file may be used under the terms of the MIT License.
 *
 * Adjusted by Ingo Weinhold <bonefish@cs.tu-berlin.de> for usage in RAM FS.
 */
#ifndef QUERY_H
#define QUERY_H


#include <OS.h>
#include <SupportDefs.h>
#include <fs_query.h>

#include <util/DoublyLinkedList.h>

#include "Index.h"
#include "ramfs.h"


namespace QueryParser {
        template<typename QueryPolicy> class Query;
};

class Node;
class Volume;


class Query : public DoublyLinkedListLinkImpl<Query> {
public:
                                                        ~Query();

        static  status_t                Create(Volume* volume, const char* queryString,
                                                                uint32 flags, port_id port, uint32 token,
                                                                Query*& _query);

                        status_t                Rewind();
                        status_t                GetNextEntry(struct dirent* entry, size_t size);

                        void                    LiveUpdate(Entry* entry, Node* node,
                                                                const char* attribute, int32 type,
                                                                const void* oldKey, size_t oldLength,
                                                                const void* newKey, size_t newLength);

private:
                        struct QueryPolicy;
                        friend struct QueryPolicy;
                        typedef QueryParser::Query<QueryPolicy> QueryImpl;

private:
                                                        Query(Volume* volume);

                        status_t                _Init(const char* queryString, uint32 flags,
                                                                port_id port, uint32 token);

private:
                        Volume*                 fVolume;
                        QueryImpl*              fImpl;
};


#endif  /* QUERY_H */