Examples with VarPattern ai.grakn.graql.VarPattern used on opensource projects

Example 26 with VarPattern

use of ai.grakn.graql.VarPattern in project grakn by graknlabs.

the class RelationshipAtom method getMultiUnifier.

@Override
public MultiUnifier getMultiUnifier(Atom pAtom, UnifierComparison unifierType) {
    Unifier baseUnifier = super.getUnifier(pAtom);
    Set<Unifier> unifiers = new HashSet<>();
    if (pAtom.isRelation()) {
        // This is safe due to the check above
        assert (pAtom instanceof RelationshipAtom);
        RelationshipAtom parentAtom = (RelationshipAtom) pAtom;
        // this is important for cases like unifying ($r1: $x, $r2: $y) with itself
        if (this.equals(parentAtom) && this.getPartialSubstitutions().collect(toSet()).equals(parentAtom.getPartialSubstitutions().collect(toSet())) && this.getTypeConstraints().collect(toSet()).equals(parentAtom.getTypeConstraints().collect(toSet()))) {
            return new MultiUnifierImpl();
        }
        boolean unifyRoleVariables = parentAtom.getRelationPlayers().stream().map(RelationPlayer::getRole).flatMap(CommonUtil::optionalToStream).anyMatch(rp -> rp.var().isUserDefinedName());
        getRelationPlayerMappings(parentAtom, unifierType).forEach(mappingList -> {
            Multimap<Var, Var> varMappings = HashMultimap.create();
            mappingList.forEach(rpm -> {
                // add role player mapping
                varMappings.put(rpm.getKey().getRolePlayer().var(), rpm.getValue().getRolePlayer().var());
                // add role var mapping if needed
                VarPattern childRolePattern = rpm.getKey().getRole().orElse(null);
                VarPattern parentRolePattern = rpm.getValue().getRole().orElse(null);
                if (parentRolePattern != null && childRolePattern != null && unifyRoleVariables) {
                    varMappings.put(childRolePattern.admin().var(), parentRolePattern.admin().var());
                }
            });
            unifiers.add(baseUnifier.merge(new UnifierImpl(varMappings)));
        });
    } else {
        unifiers.add(baseUnifier);
    }
    return new MultiUnifierImpl(unifiers);
}

Example 27 with VarPattern

use of ai.grakn.graql.VarPattern in project grakn by graknlabs.

the class RelationshipAtom method inferRoles.

/**
 * attempt to infer role types of this relation and return a fresh relationship with inferred role types
 * @return either this if nothing/no roles can be inferred or fresh relation with inferred role types
 */
private RelationshipAtom inferRoles(Answer sub) {
    // return if all roles known and non-meta
    List<Role> explicitRoles = getExplicitRoles().collect(Collectors.toList());
    Map<Var, Type> varTypeMap = getParentQuery().getVarTypeMap(sub);
    boolean allRolesMeta = explicitRoles.stream().allMatch(role -> Schema.MetaSchema.isMetaLabel(role.getLabel()));
    boolean roleRecomputationViable = allRolesMeta && (!sub.isEmpty() || !Sets.intersection(varTypeMap.keySet(), getRolePlayers()).isEmpty());
    if (explicitRoles.size() == getRelationPlayers().size() && !roleRecomputationViable)
        return this;
    GraknTx graph = getParentQuery().tx();
    Role metaRole = graph.admin().getMetaRole();
    List<RelationPlayer> allocatedRelationPlayers = new ArrayList<>();
    RelationshipType relType = getSchemaConcept() != null ? getSchemaConcept().asRelationshipType() : null;
    // explicit role types from castings
    List<RelationPlayer> inferredRelationPlayers = new ArrayList<>();
    getRelationPlayers().forEach(rp -> {
        Var varName = rp.getRolePlayer().var();
        VarPatternAdmin rolePattern = rp.getRole().orElse(null);
        if (rolePattern != null) {
            Label roleLabel = rolePattern.getTypeLabel().orElse(null);
            // allocate if variable role or if label non meta
            if (roleLabel == null || !Schema.MetaSchema.isMetaLabel(roleLabel)) {
                inferredRelationPlayers.add(RelationPlayer.of(rolePattern, varName.admin()));
                allocatedRelationPlayers.add(rp);
            }
        }
    });
    // remaining roles
    // role types can repeat so no matter what has been allocated still the full spectrum of possibilities is present
    // TODO make restrictions based on cardinality constraints
    Set<Role> possibleRoles = relType != null ? relType.relates().collect(toSet()) : inferPossibleTypes(sub).stream().filter(Concept::isRelationshipType).map(Concept::asRelationshipType).flatMap(RelationshipType::relates).collect(toSet());
    // possible role types for each casting based on its type
    Map<RelationPlayer, Set<Role>> mappings = new HashMap<>();
    getRelationPlayers().stream().filter(rp -> !allocatedRelationPlayers.contains(rp)).forEach(rp -> {
        Var varName = rp.getRolePlayer().var();
        Type type = varTypeMap.get(varName);
        mappings.put(rp, top(type != null ? compatibleRoles(type, possibleRoles) : possibleRoles));
    });
    // allocate all unambiguous mappings
    mappings.entrySet().stream().filter(entry -> entry.getValue().size() == 1).forEach(entry -> {
        RelationPlayer rp = entry.getKey();
        Var varName = rp.getRolePlayer().var();
        Role role = Iterables.getOnlyElement(entry.getValue());
        VarPatternAdmin rolePattern = Graql.var().label(role.getLabel()).admin();
        inferredRelationPlayers.add(RelationPlayer.of(rolePattern, varName.admin()));
        allocatedRelationPlayers.add(rp);
    });
    // fill in unallocated roles with metarole
    getRelationPlayers().stream().filter(rp -> !allocatedRelationPlayers.contains(rp)).forEach(rp -> {
        Var varName = rp.getRolePlayer().var();
        VarPatternAdmin rolePattern = rp.getRole().orElse(null);
        rolePattern = rolePattern != null ? rolePattern.var().label(metaRole.getLabel()).admin() : Graql.var().label(metaRole.getLabel()).admin();
        inferredRelationPlayers.add(RelationPlayer.of(rolePattern, varName.admin()));
    });
    VarPattern relationPattern = relationPattern(getVarName(), inferredRelationPlayers);
    VarPatternAdmin newPattern = (isDirect() ? relationPattern.directIsa(getPredicateVariable()) : relationPattern.isa(getPredicateVariable())).admin();
    return create(newPattern, getPredicateVariable(), getTypeId(), getParentQuery());
}

Example 28 with VarPattern

use of ai.grakn.graql.VarPattern in project grakn by graknlabs.

the class RelationshipAtom method relationPattern.

/**
 * construct a $varName (rolemap) isa $typeVariable relation
 * @param varName            variable name
 * @param relationPlayers list of rolePlayer-roleType mappings
 * @return corresponding {@link VarPatternAdmin}
 */
private VarPattern relationPattern(Var varName, List<RelationPlayer> relationPlayers) {
    VarPattern var = varName;
    for (RelationPlayer rp : relationPlayers) {
        VarPatternAdmin rolePattern = rp.getRole().orElse(null);
        var = rolePattern != null ? var.rel(rolePattern, rp.getRolePlayer()) : var.rel(rp.getRolePlayer());
    }
    return var.admin();
}

Example 29 with VarPattern

use of ai.grakn.graql.VarPattern in project grakn by graknlabs.

the class ResourceAtom method rewriteWithRelationVariable.

@Override
public ResourceAtom rewriteWithRelationVariable() {
    Var attributeVariable = getPredicateVariable();
    Var relationVariable = getRelationVariable().asUserDefined();
    VarPattern newVar = getVarName().has(getSchemaConcept().getLabel(), attributeVariable, relationVariable);
    return create(newVar.admin(), attributeVariable, relationVariable, getTypeId(), getMultiPredicate(), getParentQuery());
}

Example 30 with VarPattern

use of ai.grakn.graql.VarPattern in project grakn by graknlabs.

the class AttributeConverter method pattern.

public Pattern pattern(Attribute concept) {
    Var owner = Graql.var().asUserDefined();
    VarPattern resourceVar = Graql.var().asUserDefined().val(concept.getValue());
    return owner.has(concept.type().getLabel(), resourceVar).id(concept.owner().getId());
}