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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
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.dbsync.merge.token;
  
  import org.apache.cayenne.dbsync.merge.context.MergeDirection;
  import org.apache.cayenne.dbsync.merge.context.MergerContext;
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  
  /**
   * The reverse of a {@link MergerToken} that can not be reversed.. This will not execute
   * any thing, but {@link #createReverse(MergerTokenFactory)} will get back the reverse that
   * this was made from.
   */
  public class DummyReverseToken implements MergerToken {
  
      private MergerToken reverse;
  
      public DummyReverseToken(MergerToken reverse) {
          this.reverse = reverse;
      }
  
      @Override
      public MergerToken createReverse(MergerTokenFactory factory) {
          return reverse;
      }
  
      @Override
      public void execute(MergerContext mergerContext) {
          // can not execute
      }
  
      @Override
      public boolean isEmpty() {
          return true;
      }
  
      @Override
      public MergeDirection getDirection() {
          return reverse.getDirection().reverseDirection();
      }
  
      @Override
      public String getTokenName() {
          return "Can not execute the reverse of " + reverse.getTokenName();
      }
  
      @Override
      public String getTokenValue() {
          return reverse.getTokenValue();
      }
  
      @Override
      public int getSortingWeight() {
          return 0;
      }
  
      @Override
      public int compareTo(MergerToken o) {
          return -o.getSortingWeight();
      }
  }
  