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// -*- Mode: C++ -*- |
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// GiSTpredicate.h |
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// |
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// Copyright (c) 1996, Regents of the University of California |
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// $Header: /usr/local/devel/GiST/libGiST/libGiST/GiSTpredicate.h,v 1.1.1.1 1996/08/06 23:47:22 jmh Exp $ |
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#ifndef GISTPREDICATE_H |
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#define GISTPREDICATE_H |
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#include <iostream.h> |
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#include "GiSTdefs.h" |
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#include "GiSTentry.h" |
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// The GiSTpredicate class itself doesn't do much except serve as a |
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// placeholder for the Consistent method. However, some handy Boolean |
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// connectors are here as well (And, Or, Not) and well as True. |
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class GiSTentry; |
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class GiSTpredicate: public GiSTobject { |
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public: |
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GiSTobjid IsA() const { return GISTPREDICATE_CLASS; } |
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virtual int Consistent(const GiSTentry& entry) const=0; |
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virtual ~GiSTpredicate() {} |
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}; |
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class PtrPredicate: public GiSTpredicate { |
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public: |
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PtrPredicate(GiSTpage page): page(page) {} |
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int Consistent(const GiSTentry& entry) const; |
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GiSTobject *Copy() const; |
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#ifdef PRINTING_OBJECTS |
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void Print(ostream& os) const; |
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#endif |
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private: |
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GiSTpage page; |
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}; |
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class AndPredicate: public GiSTpredicate { |
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public: |
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AndPredicate(GiSTpredicate *q1, GiSTpredicate *q2): q1(q1), q2(q2) {} |
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int Consistent(const GiSTentry& entry) const { return q1->Consistent(entry)&&q2->Consistent(entry); } |
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#ifdef PRINTING_OBJECTS |
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void Print(ostream& os) const { |
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os << "(" << *q1 << " and " << *q2 << ")"; |
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} |
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#endif |
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GiSTobject *Copy() const { |
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return new AndPredicate((GiSTpredicate*)q1->Copy(), (GiSTpredicate*)q2->Copy()); |
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} |
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~AndPredicate() { |
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if(q1) delete q1; |
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if(q2) delete q2; |
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} |
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private: |
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GiSTpredicate *q1, *q2; |
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}; |
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class OrPredicate: public GiSTpredicate { |
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public: |
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OrPredicate(GiSTpredicate *q1, GiSTpredicate *q2): q1(q1), q2(q2) {} |
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int Consistent(const GiSTentry& entry) const { |
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return q1->Consistent(entry)||q2->Consistent(entry); |
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} |
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#ifdef PRINTING_OBJECTS |
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void Print(ostream& os) const { |
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os << "(" << *q1 << " or " << *q2 << ")"; |
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} |
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#endif |
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GiSTobject *Copy() const { |
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return new OrPredicate((GiSTpredicate*)q1->Copy(), (GiSTpredicate*)q2->Copy()); |
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} |
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~OrPredicate() { |
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if(q1) delete q1; |
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if(q2) delete q2; |
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} |
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private: |
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GiSTpredicate *q1, *q2; |
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}; |
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class NotPredicate: public GiSTpredicate { |
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public: |
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NotPredicate(GiSTpredicate *q): q(q) {} |
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int Consistent(const GiSTentry& entry) const { |
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return !q->Consistent(entry); |
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} |
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GiSTobject *Copy() const { |
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return new NotPredicate((GiSTpredicate*)q->Copy()); |
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} |
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#ifdef PRINTING_OBJECTS |
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void Print(ostream& os) const { |
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os << "(not " << *q << ")"; |
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} |
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#endif |
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~NotPredicate() { if(q) delete q; } |
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private: |
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GiSTpredicate *q; |
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}; |
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class TruePredicate: public GiSTpredicate { |
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public: |
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TruePredicate() {} |
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int Consistent(const GiSTentry& entry) const { return 1; } |
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GiSTobject *Copy() const { return new TruePredicate; } |
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#ifdef PRINTING_OBJECTS |
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void Print(ostream& os) const { |
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os << "true"; |
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} |
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#endif |
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}; |
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#endif |
