package support;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Concrete TarjanNode subclass for use in tests.
 *
 * Because GraphUtils.TarjanNode is an abstract class in an internal package
 * (com.sun.tools.javac.util), tests that exercise GraphUtils.tarjan() directly
 * must extend it. This class provides a minimal, concrete implementation.
 *
 * Usage (requires --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED):
 *
 *   AbstractTestNode n = new AbstractTestNode("N0");
 *   n.addDep(other);
 *   GraphUtils.tarjan(List.of(n));
 */
public class AbstractTestNode
        extends com.sun.tools.javac.util.GraphUtils.TarjanNode<String, AbstractTestNode> {

    private final List<AbstractTestNode> deps = new ArrayList<>();

    public AbstractTestNode(String label) {
        super(label);
    }

    public void addDep(AbstractTestNode dep) {
        deps.add(dep);
    }

    @Override
    public Iterable<? extends AbstractTestNode> getAllDependencies() {
        return deps;
    }

    @Override
    public com.sun.tools.javac.util.GraphUtils.DependencyKind[] getSupportedDependencyKinds() {
        return new com.sun.tools.javac.util.GraphUtils.DependencyKind[0];
    }

    @Override
    public Collection<? extends AbstractTestNode> getDependenciesByKind(
            com.sun.tools.javac.util.GraphUtils.DependencyKind dk) {
        return List.of();
    }

    @Override
    public String toString() {
        return data;
    }
}