burlap.behavior.statehashing

Class DiscreteMaskHashingFactory

java.lang.Object

burlap.behavior.statehashing.DiscreteStateHashFactory

burlap.behavior.statehashing.DiscreteMaskHashingFactory

All Implemented Interfaces:

StateHashFactory

public class DiscreteMaskHashingFactory
extends DiscreteStateHashFactory

Like the DiscreteStateHashFactory (which this class extends) this class computes unique hash codes for states based on attributes that the client specifies to use. However, unlike the superclass, this class also performs state equality checks using only the attributes specified for each class. This is often a useful abstraction for components like options whose policies are invariant to attributes specifying properties like ultimate task goal locations.

Author:

James MacGlashan

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	DiscreteMaskHashingFactory.DiscreteMaskHashTuple

Nested classes/interfaces inherited from class burlap.behavior.statehashing.DiscreteStateHashFactory

DiscreteStateHashFactory.DiscreteStateHashTuple

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Map<java.lang.String,java.util.List<Attribute>>	attributesForEquality

Fields inherited from class burlap.behavior.statehashing.DiscreteStateHashFactory

attributesForHashCode

Constructor Summary

Constructors

Constructor and Description
DiscreteMaskHashingFactory() Initializes this hashing factory to compute hash codes and equality checks with all attributes of all object classes.
DiscreteMaskHashingFactory(java.util.Map<java.lang.String,java.util.List<Attribute>> attributesForHashCode) Initializes this hashing factory to hash and equality check on only the attributes for the specified classes in the provided map

Method Summary

Methods

Modifier and Type	Method and Description
StateHashTuple	hashState(State s)

Methods inherited from class burlap.behavior.statehashing.DiscreteStateHashFactory

addAttributeForClass, setAttributesForClass, setAttributesForHashCode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

attributesForEquality

protected java.util.Map<java.lang.String,java.util.List<Attribute>> attributesForEquality

Constructor Detail

DiscreteMaskHashingFactory

public DiscreteMaskHashingFactory()

Initializes this hashing factory to compute hash codes and equality checks with all attributes of all object classes.

DiscreteMaskHashingFactory

public DiscreteMaskHashingFactory(java.util.Map<java.lang.String,java.util.List<Attribute>> attributesForHashCode)

Initializes this hashing factory to hash and equality check on only the attributes for the specified classes in the provided map

Parameters:

attributesForHashCode - a map from object class names to the attributes that should be used in the hash calculation and equality check for those object classes.

Method Detail

hashState

public StateHashTuple hashState(State s)

Specified by:

hashState in interface StateHashFactory

Overrides:

hashState in class DiscreteStateHashFactory