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  package org.apache.cayenne.dbsync.merge;
  
  import java.util.Collection;
  import java.util.List;
  
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.map.DataMap;
  
  class ChainMerger<T, M> extends AbstractMerger<T, M> {
  
      private final AbstractMerger<T, M> merger;
  
      private final AbstractMerger<?, T> parentMerger;
  
      ChainMerger(MergerTokenFactory tokenFactory, AbstractMerger<T, M> merger, AbstractMerger<?, T> parentMerger) {
          super(tokenFactory);
          this.merger = merger;
          this.parentMerger = parentMerger;
      }
  
      @Override
      public List<MergerToken> createMergeTokens() {
          return createMergeTokens(null, null);
      }
  
      @Override
      MergerDictionaryDiff<M> createDiff(T unused1, T unused2) {
          MergerDictionaryDiff<M> diff = new MergerDictionaryDiff<>();
          MergerDictionaryDiff<T> parentDiff = parentMerger.getDiff();
          merger.setOriginalDictionary(parentMerger.getOriginalDictionary());
          for(MergerDiffPair<T> pair : parentDiff.getSame()) {
              diff.addAll(merger.createDiff(pair.getOriginal(), pair.getImported()));
          }
          return diff;
      }
  
      @Override
      Collection<MergerToken> createTokensForMissingOriginal(M imported) {
          return merger.createTokensForMissingOriginal(imported);
      }
  
      @Override
      Collection<MergerToken> createTokensForMissingImported(M original) {
          return merger.createTokensForMissingImported(original);
      }
  
      @Override
      Collection<MergerToken> createTokensForSame(MergerDiffPair<M> same) {
          return merger.createTokensForSame(same);
      }
  }
  