Relation3MapRelImpl

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jpaul.DataStructs
Class Relation3MapRelImpl<Ta,Tb,Tc>

java.lang.Object
  jpaul.DataStructs.Relation3<Ta,Tb,Tc>
      jpaul.DataStructs.Relation3MapRelImpl<Ta,Tb,Tc>

public class Relation3MapRelImpl<Ta,Tb,Tc>
extends Relation3<Ta,Tb,Tc>
extends Relation3<Ta,Tb,Tc>

Relation3MapRelImpl is a simple implementation of Relation3, backed by a Map from Ta keys to RelationTb,Tc between Tb and Tc.

Version:: $Id: Relation3MapRelImpl.java,v 1.5 2005/10/31 22:30:12 salcianu Exp $
Author:: Alexandru Salcianu - salcianu@alum.mit.edu

Constructor Summary
`Relation3MapRelImpl()` Creates a `Relation3MapRelImpl` object using a factory of `LinkedHashMap`s and a factory of `MapSetRelation`s.
`Relation3MapRelImpl(MapFactory<Ta,Relation<Tb,Tc>> mapFact, RelationFactory<Tb,Tc> relFact)` Creates a `Relation3MapRelImpl`.

Method Summary
`boolean`	`add(Ta a, Tb b, Tc c)` Adds the triple <a,b,c> to `this` ternary relation.
`boolean`	`contains(Ta a, Tb b, Tc c)` Checks the presence of the triple <a,b,c> in `this` ternary relation.
`java.util.Collection<Tb>`	`get2ndValues(Ta a)` Returns the elements that appear in the 2nd position of at least one triple that appears in `this` ternary relation and has `a` in its 1st position.
`java.util.Collection<Tc>`	`get3rdValues(Ta a, Tb b)` Returns the elements that appear in the third position of at least one triple of the form <a,b,*%gt; that appears in `this` ternary relation.
`java.util.Collection<Ta>`	`getKeys()` Returns the elements that appear in the 1st position of at least one triple from `this` ternary relation.
`static void`	`main(java.lang.String[] args)`
`boolean`	`remove(Ta a, Tb b, Tc c)` Removes the triple <a,b,c> from `this` ternary relation.

Methods inherited from class jpaul.DataStructs.Relation3
`toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

Relation3MapRelImpl

public Relation3MapRelImpl(MapFactory<Ta,Relation<Tb,Tc>> mapFact,
                           RelationFactory<Tb,Tc> relFact)

Creates a Relation3MapRelImpl. This constructor allows the user to indicate what map and relation implementations he wants to use. Therefore, this constructor is good while finely-tuning the performances of an application using a large number of small ternary relations.

Relation3MapRelImpl

public Relation3MapRelImpl()

Creates a Relation3MapRelImpl object using a factory of LinkedHashMaps and a factory of MapSetRelations. This default constructor consumes a lot of memory but should work just fine for large and not-very-frequent ternary relations.

Method Detail