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Java re-implementation of tiny graphviz

There is a newer version: 1.3.1

/*
 * Copyright 2022 The graph-support project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.graphper.def;

import java.io.Serializable;

/**
 * Abstract directed edge object.
 *
 * @param  vertex type
 * @param  subclass type
 * @author Jamison Jiang
 */
public abstract class AbstractDirectedEdge>
    extends AbstractEdge implements DirectedEdge, Serializable {

  private static final long serialVersionUID = 7419657082828781230L;

  /**
   * Initialize edges based on vertices, with weights defaulting to 0.
   *
   * @param from from vertex of edge
   * @param to   to vertex of edge
   */
  protected AbstractDirectedEdge(V from, V to) {
    super(from, to);
  }

  /**
   * Initialize edges from vertices and weights.
   *
   * @param from   from vertex of edge
   * @param to     to vertex of edge
   * @param weight weight of edge
   */
  protected AbstractDirectedEdge(V from, V to, double weight) {
    super(from, to, weight);
  }

  @Override
  public V from() {
    return left;
  }

  @Override
  public V to() {
    return right;
  }

  @Override
  public boolean equals(Object obj) {
    return super.equals(obj) && obj instanceof AbstractDirectedEdge;
  }

  @Override
  public int hashCode() {
    return super.hashCode() + AbstractDirectedEdge.class.hashCode();
  }

  @Override
  public String toString() {
    return "DefaultDirectedEdge{" +
        "from=" + left +
        ", to=" + right +
        ", weight=" + weight +
        "} " + super.toString();
  }
}