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/*
 * Copyright 2008 The Closure Compiler Authors.
 *
 * 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 com.google.javascript.jscomp.graph;

import java.util.List;

/**
 * A graph that can be dumped to a Graphviz DOT file.
 * 
 * An object which can be visualized as a graph should implement this interface.
 * The {@link com.google.javascript.jscomp.DotFormatter#toDot} function can be used to get a
 * visualization of the object for debugging purpose.
 */
public interface GraphvizGraph {

  /**
   * Name of the graph.
   *
   * @return Name of the graph.
   */
  String getName();

  /**
   * Graph type.
   *
   * @return True if the graph is a directed graph.
   */
  boolean isDirected();

  /**
   * Retrieve a list of nodes in the graph.
   *
   * @return A list of nodes in the graph.
   */
  List getGraphvizNodes();

  /**
   * Retrieve a list of edges in the graph.
   *
   * @return A list of edges in the graph.
   */
  List getGraphvizEdges();


  /**
   * A Graphviz node.
   */
  interface GraphvizNode {

    /**
     * Retrieves the unique ID.
     *
     * @return A the unique ID of the node.
     */
    String getId();

    /**
     * Retrieves color of the node.
     *
     * @return The color of the node.
     */
    String getColor();

    /**
     * Retrieves the label of the node.
     *
     * @return Label of the node.
     */
    String getLabel();
  }


  /**
   * A Graphviz edge.
   */
  interface GraphvizEdge {

    /**
     * Get the first node in the edge. In a directed node, this will be the
     * source node.
     *
     * @return First node in the edge.
     */
    String getNode1Id();

    /**
     * Get the second node in the edge. In a directed node, this will be the
     * destination node.
     *
     * @return First node in the edge.
     */
    String getNode2Id();

    /**
     * Retrieves color of the edge.
     *
     * @return The color of the edge.
     */
    String getColor();

    /**
     * Retrieves the label of the edge.
     *
     * @return Label of the edge.
     */
    String getLabel();
  }
}