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  package org.apache.cayenne.dbsync.merge.token.model;
  
  import org.apache.cayenne.dbsync.merge.context.MergerContext;
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.DbJoin;
  import org.apache.cayenne.map.DbRelationship;
  import org.apache.cayenne.map.ObjEntity;
  
  public class AddRelationshipToModel extends AbstractToModelToken.Entity {
  
      public static final String COMMA_SEPARATOR = ", ";
      public static final int COMMA_SEPARATOR_LENGTH = COMMA_SEPARATOR.length();
  
      private DbRelationship relationship;
  
      public AddRelationshipToModel(DbEntity entity, DbRelationship relationship) {
          super("Add Relationship", 125, entity);
          this.relationship = relationship;
      }
  
      public static String getTokenValue(DbRelationship rel) {
          String attributes = "";
          if (rel.getJoins().size() == 1) {
              attributes = rel.getJoins().get(0).getTargetName();
          } else {
              for (DbJoin dbJoin : rel.getJoins()) {
                  attributes += dbJoin.getTargetName() + COMMA_SEPARATOR;
              }
  
              if(attributes.isEmpty()) {
                  attributes = "{}";
              } else {
                  attributes = "{" + attributes.substring(0, attributes.length() - COMMA_SEPARATOR_LENGTH) + "}";
              }
          }
  
          return rel.getName() + " " + rel.getSourceEntity().getName() + "->" + rel.getTargetEntityName() + "." + attributes;
      }
  
      @Override
      public MergerToken createReverse(MergerTokenFactory factory) {
          return factory.createDropRelationshipToDb(getEntity(), relationship);
      }
  
      @Override
      public void execute(MergerContext context) {
          // Set name to relationship if it was created without it, e.g. in createReverse() action
          if(relationship.getName() == null) {
              relationship.setName(context.getNameGenerator().relationshipName(relationship));
          }
  
          getEntity().addRelationship(relationship);
          for (ObjEntity e : getMappedObjEntities()) {
              context.getEntityMergeSupport().synchronizeOnDbRelationshipAdded(e, relationship);
          }
  
          context.getDelegate().dbRelationshipAdded(relationship);
      }
  
      @Override
      public String getTokenValue() {
          return getTokenValue(relationship);
      }
  }
  