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   *  to you under the Apache License, Version 2.0 (the
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.dbsync.merge;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.TreeSet;
  
  import org.apache.cayenne.dbsync.reverse.filters.FiltersConfig;
  import org.apache.cayenne.dbsync.reverse.filters.PatternFilter;
  import org.apache.cayenne.dbsync.reverse.filters.TableFilter;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.DbJoin;
  import org.apache.cayenne.map.DbRelationship;
  
  class DbRelationshipDictionary extends MergerDictionary<DbRelationship> {
  
      private final DbEntity container;
  
      private final FiltersConfig filtersConfig;
  
      DbRelationshipDictionary(DbEntity container, FiltersConfig filtersConfig) {
          this.container = container;
          this.filtersConfig = filtersConfig;
      }
  
      @Override
      String getName(DbRelationship entity) {
          return new Signature(entity).getName();
      }
  
      @Override
      Collection<DbRelationship> getAll() {
          return filter();
      }
  
      /**
       * @since 4.1
       */
      private Collection<DbRelationship> filter() {
          if(filtersConfig == null) {
              return container.getRelationships();
          }
  
          Collection<DbRelationship> existingFiltered = new LinkedList<>();
          TableFilter tableFilter = filtersConfig.tableFilter(container.getCatalog(), container.getSchema());
          if(tableFilter != null && tableFilter.isIncludeTable(container.getName())){
              PatternFilter patternFilter = tableFilter.getIncludeTableRelationshipFilter(container.getName());
              for(DbRelationship rel : container.getRelationships()){
                  if(patternFilter.isIncluded(rel.getName())){
                      existingFiltered.add(rel);
                  }
              }
          }
          return existingFiltered;
      }
  
      /**
       * Signature of DbRelationship is sorted strings generated from its DbJoins
       */
      private static class Signature {
          private final DbRelationship relationship;
  
          private String[] joinSignature;
  
          private Signature(DbRelationship relationship) {
              this.relationship = relationship;
              build();
          }
  
          public String getName() {
              if(joinSignature.length == 0) {
                  return "";
              }
              String name = joinSignature[0];
              for(int i=1; i<joinSignature.length; i++) {
                  name += "|" + joinSignature[i];
              }
              return name;
          }
  
          private void build() {
              TreeSet<String> joins = new TreeSet<>();
              for(DbJoin join : relationship.getJoins()) {
                  joins.add(
                          relationship.getSourceEntityName() + "." + join.getSourceName()
                          + ">" +
                          relationship.getTargetEntityName() + "." + join.getTargetName()
                  );
              }
              joinSignature = joins.toArray(new String[0]);
          }
      }
  }
  