hydra.lib.maps.IsEmpty Maven / Gradle / Ivy

Go to download
package hydra.lib.maps;

import hydra.Flows;
import hydra.compute.Flow;
import hydra.core.Name;
import hydra.core.Term;
import hydra.core.Type;
import hydra.dsl.Expect;
import hydra.dsl.Terms;
import hydra.graph.Graph;
import hydra.tools.PrimitiveFunction;

import java.util.List;
import java.util.Map;
import java.util.function.Function;

import static hydra.dsl.Types.boolean_;
import static hydra.dsl.Types.function;
import static hydra.dsl.Types.lambda;
import static hydra.dsl.Types.map;

public class IsEmpty extends PrimitiveFunction {
    public Name name() {
        return new Name("hydra/lib/maps.isEmpty");
    }

    @Override
    public Type type() {
        return lambda("k", "v", function(
                map("k", "v"),
                boolean_()));
    }

    @Override
    protected Function>, Flow, Term>> implementation() {
        return args -> {
            Flow, Map, Term>> r = Expect.map(Flows::pure, Flows::pure, args.get(0));
            return Flows.map(r, map -> Terms.boolean_(apply(map)));
        };
    }

    public static  boolean apply(Map map) {
        return map.isEmpty();
    }
}