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/*
 * (C) Copyright 2003-2021, by Barak Naveh and Contributors.
 *
 * JGraphT : a free Java graph-theory library
 *
 * See the CONTRIBUTORS.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the
 * GNU Lesser General Public License v2.1 or later
 * which is available at
 * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
 */
package org.jgrapht.graph;

import org.jgrapht.graph.builder.*;
import org.jgrapht.util.*;

import java.util.function.*;

/**
 * The default implementation of a directed graph. A default directed graph is a non-simple directed
 * graph in which multiple (parallel) edges between any two vertices are not permitted, but
 * loops are.
 * 
 * @param  the graph vertex type
 * @param  the graph edge type
 * 
 */
public class DefaultDirectedGraph
    extends
    AbstractBaseGraph
{
    private static final long serialVersionUID = -2066644490824847621L;

    /**
     * Creates a new graph.
     *
     * @param edgeClass class on which to base the edge supplier
     */
    public DefaultDirectedGraph(Class edgeClass)
    {
        this(null, SupplierUtil.createSupplier(edgeClass), false);
    }

    /**
     * Creates a new graph.
     * 
     * @param vertexSupplier the vertex supplier, can be null
     * @param edgeSupplier the edge supplier, can be null
     * @param weighted whether the graph is weighted or not
     */
    public DefaultDirectedGraph(
        Supplier vertexSupplier, Supplier edgeSupplier, boolean weighted)
    {
        super(
            vertexSupplier, edgeSupplier,
            new DefaultGraphType.Builder()
                .directed().allowMultipleEdges(false).allowSelfLoops(true).weighted(weighted)
                .build());
    }

    /**
     * Create a builder for this kind of graph.
     * 
     * @param edgeClass class on which to base factory for edges
     * @param  the graph vertex type
     * @param  the graph edge type
     * @return a builder for this kind of graph
     */
    public static  GraphBuilder> createBuilder(
        Class edgeClass)
    {
        return new GraphBuilder<>(new DefaultDirectedGraph<>(edgeClass));
    }

    /**
     * Create a builder for this kind of graph.
     * 
     * @param edgeSupplier the edge supplier of the new graph
     * @param  the graph vertex type
     * @param  the graph edge type
     * @return a builder for this kind of graph
     */
    public static  GraphBuilder> createBuilder(
        Supplier edgeSupplier)
    {
        return new GraphBuilder<>(new DefaultDirectedGraph<>(null, edgeSupplier, false));
    }

}