| 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 |
