Package net.sf.tweety.logics.rdl.syntax
Class DefaultTheory
- java.lang.Object
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- net.sf.tweety.logics.rdl.syntax.DefaultTheory
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- All Implemented Interfaces:
BeliefBase
public class DefaultTheory extends java.lang.Object implements BeliefBase
Models a default theory in Reiter's default logic, see [R. Reiter. A logic for default reasoning. Artificial Intelligence, 13:81–132, 1980].- Author:
- Matthias Thimm, Nils Geilen
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Constructor Summary
Constructors Constructor Description DefaultTheory()
constructs empty default theoryDefaultTheory(FolBeliefSet facts, java.util.Collection<DefaultRule> defaults)
constructs a default theory from a knowledge base and a set of defaults
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Method Summary
Modifier and Type Method Description java.util.Collection<DefaultRule>
getDefaults()
FolBeliefSet
getFacts()
Signature
getMinimalSignature()
Returns the signature of the language of this knowledge base.DefaultTheory
ground()
Removes Variables by expanding formulasjava.lang.String
toString()
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Constructor Detail
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DefaultTheory
public DefaultTheory()
constructs empty default theory
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DefaultTheory
public DefaultTheory(FolBeliefSet facts, java.util.Collection<DefaultRule> defaults)
constructs a default theory from a knowledge base and a set of defaults- Parameters:
facts
- the knowledge basedefaults
- the defaults
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Method Detail
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getDefaults
public java.util.Collection<DefaultRule> getDefaults()
- Returns:
- all the default rules
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ground
public DefaultTheory ground()
Removes Variables by expanding formulas- Returns:
- grounded version of the default theory
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getMinimalSignature
public Signature getMinimalSignature()
Description copied from interface:BeliefBase
Returns the signature of the language of this knowledge base.- Specified by:
getMinimalSignature
in interfaceBeliefBase
- Returns:
- the signature of the language of this knowledge base.
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toString
public java.lang.String toString()
- Specified by:
toString
in interfaceBeliefBase
- Overrides:
toString
in classjava.lang.Object
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getFacts
public FolBeliefSet getFacts()
- Returns:
- FoL formulas in default theories
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