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  package org.apache.cayenne.dbsync.merge;
  
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.map.DataMap;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  abstract class AbstractMerger<T, M> implements Merger<T> {
  
      private MergerDictionaryDiff<M> diff;
      private MergerTokenFactory tokenFactory;
      private DbEntityDictionary originalDictionary;
  
      AbstractMerger(MergerTokenFactory tokenFactory) {
          this.tokenFactory = tokenFactory;
      }
  
      @Override
      public List<MergerToken> createMergeTokens(T original, T imported) {
          diff = createDiff(original, imported);
  
          List<MergerToken> tokens = new ArrayList<>();
  
          for(MergerDiffPair<M> pair : diff.getMissing()) {
              Collection<MergerToken> tokensForMissing = createTokensForMissing(pair);
              if(tokensForMissing != null) {
                  tokens.addAll(tokensForMissing);
              }
          }
  
          for(MergerDiffPair<M> pair : diff.getSame()) {
              Collection<MergerToken> tokensForSame = createTokensForSame(pair);
              if(tokensForSame != null) {
                  tokens.addAll(tokensForSame);
              }
          }
  
          return tokens;
      }
  
      MergerDictionaryDiff<M> getDiff() {
          return diff;
      }
  
      MergerTokenFactory getTokenFactory() {
          return tokenFactory;
      }
  
      private Collection<MergerToken> createTokensForMissing(MergerDiffPair<M> missing) {
          if(missing.getOriginal() == null) {
              return createTokensForMissingOriginal(missing.getImported());
          } else {
              return createTokensForMissingImported(missing.getOriginal());
          }
      }
  
      public abstract List<MergerToken> createMergeTokens();
  
      abstract MergerDictionaryDiff<M> createDiff(T original, T imported);
  
      abstract Collection<MergerToken> createTokensForMissingOriginal(M imported);
  
      abstract Collection<MergerToken> createTokensForMissingImported(M original);
  
      abstract Collection<MergerToken> createTokensForSame(MergerDiffPair<M> same);
  
      public void setOriginalDictionary(DbEntityDictionary originalDictionary) {
          this.originalDictionary = originalDictionary;
      }
  
      public DbEntityDictionary getOriginalDictionary() {
          return originalDictionary;
      }
  }
  