* Copyright 2001-2008, Axel Dörfler, axeld@pinc-software.de.
* This file may be used under the terms of the MIT License.
*/
#ifndef QUERY_H
#define QUERY_H
#include "system_dependencies.h"
#include "Index.h"
class Volume;
class Term;
class Equation;
class TreeIterator;
class Query;
class Expression {
public:
Expression(char* expr);
~Expression();
status_t InitCheck();
const char* Position() const { return fPosition; }
Term* Root() const { return fTerm; }
protected:
Term* ParseOr(char** expr);
Term* ParseAnd(char** expr);
Term* ParseEquation(char** expr);
bool IsOperator(char** expr, char op);
private:
Expression(const Expression& other);
Expression& operator=(const Expression& other);
char* fPosition;
Term* fTerm;
};
class Query : public SinglyLinkedListLinkImpl<Query> {
public:
Query(Volume* volume, Expression* expression,
uint32 flags);
~Query();
status_t Rewind();
status_t GetNextEntry(struct dirent* , size_t size);
void SetLiveMode(port_id port, int32 token);
void LiveUpdate(Inode* inode, const char* attribute,
int32 type, const uint8* oldKey,
size_t oldLength, const uint8* newKey,
size_t newLength);
void LiveUpdateRenameMove(Inode* inode,
ino_t oldDirectoryID, const char* oldName,
size_t oldLength, ino_t newDirectoryID,
const char* newName, size_t newLength);
Expression* GetExpression() const { return fExpression; }
private:
Volume* fVolume;
Expression* fExpression;
Equation* fCurrent;
TreeIterator* fIterator;
Index fIndex;
Stack<Equation*> fStack;
uint32 fFlags;
port_id fPort;
int32 fToken;
};
#endif
