CPP-Search-engine/cmdhandler.h at main · ctutor99/CPP-Search-engine · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
#ifndef CMDHANDLER_H
#define CMDHANDLER_H
#include "handler.h"
#include "searcheng.h"
#include "combiners.h"

/**
 * Handles the QUIT command - COMPLETED in cmdhandler.cpp
 */
class QuitHandler : public Handler
{
public:
    QuitHandler();
    QuitHandler(Handler* next);

protected:

    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};

/**
 * Handles the PRINT command
 */
class PrintHandler : public Handler
{
public:
    PrintHandler();
    PrintHandler(Handler* next);

protected:

    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};


/***********  Declare the classes for other command handling:          *******/
/***********    AND, OR, and DIFF handlers                             *******/
/*********** Then define their implementation in cmdhandler.cpp        *******/
class AndHandler : public Handler
{
public:
    AndHandler();
    AndHandler(Handler* next);

protected:
    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};

// OR handler
class OrHandler : public Handler
{
public:
    OrHandler();
    OrHandler(Handler* next);

protected:
    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};

// DIFF handler
class DiffHandler : public Handler
{
public:
    DiffHandler();
    DiffHandler(Handler* next);

protected:
    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};

// INCOMING handler
class IncomingHandler : public Handler
{
public:
    IncomingHandler();
    IncomingHandler(Handler* next);

protected:
    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};

// OUTGOING handler
class OutgoingHandler : public Handler
{
public:
    OutgoingHandler();
    OutgoingHandler(Handler* next);

protected:
    virtual bool canHandle(const std::string& cmd) const;
    virtual HANDLER_STATUS_T process(SearchEng* eng, std::istream& instr, std::ostream& ostr);
};
#endif