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package tools.refinery.store.query.view;
import tools.refinery.store.map.CursorAsIterator;
import tools.refinery.store.model.Model;
import tools.refinery.store.model.Tuple;
import tools.refinery.store.model.representation.Relation;
import java.util.Objects;
import java.util.UUID;
/**
* Represents a view of a {@link Relation} that can be queried.
*
* @param <D>
* @author Oszkar Semerath
*/
public abstract class RelationView<D> {
private final Relation<D> representation;
private final String name;
protected RelationView(Relation<D> representation, String name) {
this.representation = representation;
this.name = name;
}
protected RelationView(Relation<D> representation) {
this(representation, UUID.randomUUID().toString());
}
public abstract int getArity();
public Relation<D> getRepresentation() {
return representation;
}
public String getName() {
return representation.getName() + "#" + name;
}
public abstract boolean filter(Tuple key, D value);
public abstract Object[] forwardMap(Tuple key, D value);
public abstract boolean get(Model model, Object[] tuple);
public Iterable<Object[]> getAll(Model model) {
return (() -> new CursorAsIterator<>(model.getAll(representation), this::forwardMap, this::filter));
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + Objects.hash(representation);
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!(obj instanceof RelationView))
return false;
@SuppressWarnings("unchecked")
RelationView<D> other = ((RelationView<D>) obj);
return Objects.equals(representation, other.representation);
}
}
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