edu.uci.ics.jung.visualization.util.Context Maven / Gradle / Ivy

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package edu.uci.ics.jung.visualization.util;

/**
 * A class that is used to link together a graph element and a specific graph. Provides appropriate
 * implementations of hashCode and equals.
 */
public class Context {

  /** The graph element which defines this context. */
  public final G graph;

  /** The edge element which defines this context. */
  public final E element;

  private Context(G graph, E element) {
    this.graph = graph;
    this.element = element;
  }
  /**
   * Returns an instance of this type for the specified graph and element.
   *
   * @param  the graph type
   * @param  the element type
   */
  @SuppressWarnings("unchecked")
  public static  Context getInstance(G graph, E element) {
    return new Context(graph, element);
  }

  @Override
  public int hashCode() {
    return graph.hashCode() ^ element.hashCode();
  }

  @SuppressWarnings("unchecked")
  @Override
  public boolean equals(Object o) {
    if (!(o instanceof Context)) return false;
    Context context = (Context) o;
    return context.graph.equals(graph) && context.element.equals(element);
  }
}