1 |
root |
1.1 |
// -*- Mode: C++ -*- |
2 |
|
|
|
3 |
|
|
// GiSTpredicate.h |
4 |
|
|
// |
5 |
|
|
// Copyright (c) 1996, Regents of the University of California |
6 |
|
|
// $Header: /usr/local/devel/GiST/libGiST/libGiST/GiSTpredicate.h,v 1.1.1.1 1996/08/06 23:47:22 jmh Exp $ |
7 |
|
|
|
8 |
|
|
#ifndef GISTPREDICATE_H |
9 |
|
|
#define GISTPREDICATE_H |
10 |
|
|
|
11 |
|
|
#include <iostream.h> |
12 |
|
|
#include "GiSTdefs.h" |
13 |
|
|
#include "GiSTentry.h" |
14 |
|
|
|
15 |
|
|
// The GiSTpredicate class itself doesn't do much except serve as a |
16 |
|
|
// placeholder for the Consistent method. However, some handy Boolean |
17 |
|
|
// connectors are here as well (And, Or, Not) and well as True. |
18 |
|
|
|
19 |
|
|
|
20 |
|
|
class GiSTentry; |
21 |
|
|
|
22 |
|
|
class GiSTpredicate: public GiSTobject { |
23 |
|
|
public: |
24 |
|
|
GiSTobjid IsA() const { return GISTPREDICATE_CLASS; } |
25 |
|
|
virtual int Consistent(const GiSTentry& entry) const=0; |
26 |
|
|
virtual ~GiSTpredicate() {} |
27 |
|
|
}; |
28 |
|
|
|
29 |
|
|
class PtrPredicate: public GiSTpredicate { |
30 |
|
|
public: |
31 |
|
|
PtrPredicate(GiSTpage page): page(page) {} |
32 |
|
|
int Consistent(const GiSTentry& entry) const; |
33 |
|
|
GiSTobject *Copy() const; |
34 |
|
|
#ifdef PRINTING_OBJECTS |
35 |
|
|
void Print(ostream& os) const; |
36 |
|
|
#endif |
37 |
|
|
|
38 |
|
|
private: |
39 |
|
|
GiSTpage page; |
40 |
|
|
}; |
41 |
|
|
|
42 |
|
|
class AndPredicate: public GiSTpredicate { |
43 |
|
|
public: |
44 |
|
|
AndPredicate(GiSTpredicate *q1, GiSTpredicate *q2): q1(q1), q2(q2) {} |
45 |
|
|
int Consistent(const GiSTentry& entry) const { return q1->Consistent(entry)&&q2->Consistent(entry); } |
46 |
|
|
#ifdef PRINTING_OBJECTS |
47 |
|
|
void Print(ostream& os) const { |
48 |
|
|
os << "(" << *q1 << " and " << *q2 << ")"; |
49 |
|
|
} |
50 |
|
|
#endif |
51 |
|
|
GiSTobject *Copy() const { |
52 |
|
|
return new AndPredicate((GiSTpredicate*)q1->Copy(), (GiSTpredicate*)q2->Copy()); |
53 |
|
|
} |
54 |
|
|
~AndPredicate() { |
55 |
|
|
if(q1) delete q1; |
56 |
|
|
if(q2) delete q2; |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
private: |
60 |
|
|
GiSTpredicate *q1, *q2; |
61 |
|
|
}; |
62 |
|
|
|
63 |
|
|
class OrPredicate: public GiSTpredicate { |
64 |
|
|
public: |
65 |
|
|
OrPredicate(GiSTpredicate *q1, GiSTpredicate *q2): q1(q1), q2(q2) {} |
66 |
|
|
int Consistent(const GiSTentry& entry) const { |
67 |
|
|
return q1->Consistent(entry)||q2->Consistent(entry); |
68 |
|
|
} |
69 |
|
|
#ifdef PRINTING_OBJECTS |
70 |
|
|
void Print(ostream& os) const { |
71 |
|
|
os << "(" << *q1 << " or " << *q2 << ")"; |
72 |
|
|
} |
73 |
|
|
#endif |
74 |
|
|
GiSTobject *Copy() const { |
75 |
|
|
return new OrPredicate((GiSTpredicate*)q1->Copy(), (GiSTpredicate*)q2->Copy()); |
76 |
|
|
} |
77 |
|
|
~OrPredicate() { |
78 |
|
|
if(q1) delete q1; |
79 |
|
|
if(q2) delete q2; |
80 |
|
|
} |
81 |
|
|
|
82 |
|
|
private: |
83 |
|
|
GiSTpredicate *q1, *q2; |
84 |
|
|
}; |
85 |
|
|
|
86 |
|
|
class NotPredicate: public GiSTpredicate { |
87 |
|
|
public: |
88 |
|
|
NotPredicate(GiSTpredicate *q): q(q) {} |
89 |
|
|
int Consistent(const GiSTentry& entry) const { |
90 |
|
|
return !q->Consistent(entry); |
91 |
|
|
} |
92 |
|
|
GiSTobject *Copy() const { |
93 |
|
|
return new NotPredicate((GiSTpredicate*)q->Copy()); |
94 |
|
|
} |
95 |
|
|
#ifdef PRINTING_OBJECTS |
96 |
|
|
void Print(ostream& os) const { |
97 |
|
|
os << "(not " << *q << ")"; |
98 |
|
|
} |
99 |
|
|
#endif |
100 |
|
|
~NotPredicate() { if(q) delete q; } |
101 |
|
|
|
102 |
|
|
private: |
103 |
|
|
GiSTpredicate *q; |
104 |
|
|
}; |
105 |
|
|
|
106 |
|
|
class TruePredicate: public GiSTpredicate { |
107 |
|
|
public: |
108 |
|
|
TruePredicate() {} |
109 |
|
|
int Consistent(const GiSTentry& entry) const { return 1; } |
110 |
|
|
GiSTobject *Copy() const { return new TruePredicate; } |
111 |
|
|
#ifdef PRINTING_OBJECTS |
112 |
|
|
void Print(ostream& os) const { |
113 |
|
|
os << "true"; |
114 |
|
|
} |
115 |
|
|
#endif |
116 |
|
|
}; |
117 |
|
|
|
118 |
|
|
#endif |