package org.simantics.issues.ui;

import java.util.Collection;
import java.util.Collections;

import org.simantics.browsing.ui.model.children.ChildRule;
import org.simantics.db.ReadGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.variable.Variable;

/**
 * @author Tuukka Lehtonen
 * @since 1.27
 */
public class DynamicIssueSourceHierarchyRule implements ChildRule {

    @Override
    public boolean isCompatible(Class<?> contentType) {
        return contentType.equals(Variable.class);
    }

    @Override
    public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
        Variable v = (Variable) parent;
        return v.getChildren(graph);
    }

    @Override
    public Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException {
        Variable parent = ((Variable)child).getParent(graph);
        return parent != null ? Collections.singleton(parent) : Collections.emptyList();
    }

}