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   *   Licensed to the Apache Software Foundation (ASF) under one
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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.graph;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  import org.apache.cayenne.exp.parser.ASTDbPath;
  import org.apache.cayenne.reflect.ArcProperty;
  
  /**
   * Object that represents Arc identifier.
   * Used in graph change operations.
   *
   * @since 4.2
   */
  public class ArcId implements Serializable {
  
      private static final long serialVersionUID = -3712846298213425259L;
  
      private final String forwardArc;
      private final String reverseArc;
  
      public ArcId(ArcProperty property) {
          this.forwardArc = property.getName();
          this.reverseArc = property.getComplimentaryReverseArc() == null
                  ? ASTDbPath.DB_PREFIX + property.getComplimentaryReverseDbRelationshipPath()
                  : property.getComplimentaryReverseArc().getName();
      }
  
      public ArcId(String forwardArc, String reverseArc) {
          this.forwardArc = Objects.requireNonNull(forwardArc);
          this.reverseArc = Objects.requireNonNull(reverseArc);
      }
  
      public String getForwardArc() {
          return forwardArc;
      }
  
      public String getReverseArc() {
          return reverseArc;
      }
  
      public ArcId getReverseId() {
          return new ArcId(reverseArc, forwardArc);
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          ArcId arcId = (ArcId) o;
  
          if (!forwardArc.equals(arcId.forwardArc)) return false;
          return reverseArc.equals(arcId.reverseArc);
      }
  
      @Override
      public int hashCode() {
          int result = forwardArc.hashCode();
          result = 31 * result + reverseArc.hashCode();
          return result;
      }
  
      @Override
      public String toString() {
          return forwardArc;
      }
  }
  