static org.odata4j.edm.EdmEntityType.Builder findEntityType(
     List<Builder> edmSchemas, String schemaName, String enitityName) {
   for (EdmSchema.Builder modelSchema : edmSchemas) {
     if (modelSchema.getNamespace().equals(schemaName)) {
       for (EdmEntityType.Builder type : modelSchema.getEntityTypes()) {
         if (type.getName().equals(enitityName)) {
           return type;
         }
       }
     }
   }
   return null;
 }
  private static void buildAssosiationSets(MetadataStore metadataStore, List<Builder> edmSchemas) {
    for (Schema schema : metadataStore.getSchemaList()) {

      EdmSchema.Builder odataSchema = findSchema(edmSchemas, schema.getName());
      EdmEntityContainer.Builder entityContainer =
          findEntityContainer(edmSchemas, schema.getName());
      List<EdmAssociationSet.Builder> assosiationSets = new ArrayList<EdmAssociationSet.Builder>();
      List<EdmAssociation.Builder> assosiations = new ArrayList<EdmAssociation.Builder>();

      for (Table table : schema.getTables().values()) {
        // build Associations
        for (ForeignKey fk : table.getForeignKeys()) {

          EdmEntitySet.Builder entitySet =
              findEntitySet(edmSchemas, schema.getName(), table.getName());
          EdmEntitySet.Builder refEntitySet =
              findEntitySet(edmSchemas, schema.getName(), fk.getReferenceTableName());
          EdmEntityType.Builder entityType =
              findEntityType(edmSchemas, schema.getName(), table.getName());
          EdmEntityType.Builder refEntityType =
              findEntityType(edmSchemas, schema.getName(), fk.getReferenceTableName());

          // check to see if fk is part of this table's pk, then it is 1 to 1 relation
          boolean onetoone = sameColumnSet(table.getPrimaryKey(), fk);

          // Build Association Ends
          EdmAssociationEnd.Builder endSelf =
              EdmAssociationEnd.newBuilder()
                  .setRole(table.getName())
                  .setType(entityType)
                  .setMultiplicity(onetoone ? EdmMultiplicity.ZERO_TO_ONE : EdmMultiplicity.MANY);

          EdmAssociationEnd.Builder endRef =
              EdmAssociationEnd.newBuilder()
                  .setRole(fk.getReferenceTableName())
                  .setType(refEntityType)
                  .setMultiplicity(EdmMultiplicity.ZERO_TO_ONE);

          // Build Association
          EdmAssociation.Builder association = EdmAssociation.newBuilder();
          association.setName(table.getName() + "_" + fk.getName());
          association.setEnds(endSelf, endRef);
          association.setNamespace(
              refEntityType
                  .getFullyQualifiedTypeName()
                  .substring(0, refEntityType.getFullyQualifiedTypeName().indexOf('.')));
          assosiations.add(association);

          // Build ReferentialConstraint
          if (fk.getReferenceColumns() != null) {
            EdmReferentialConstraint.Builder erc = EdmReferentialConstraint.newBuilder();
            erc.setPrincipalRole(fk.getReferenceTableName());
            erc.addPrincipalReferences(fk.getReferenceColumns());
            erc.setDependentRole(table.getName());
            erc.addDependentReferences(getColumnNames(fk.getColumns()));
            association.setRefConstraint(erc);
          }

          // Add EdmNavigationProperty to entity type
          EdmNavigationProperty.Builder nav =
              EdmNavigationProperty.newBuilder(fk.getReferenceTableName());
          nav.setRelationshipName(fk.getName());
          nav.setFromToName(table.getName(), fk.getReferenceTableName());
          nav.setRelationship(association);
          nav.setFromTo(endSelf, endRef);
          entityType.addNavigationProperties(nav);

          // Add EdmNavigationProperty to Reference entity type
          EdmNavigationProperty.Builder refNav = EdmNavigationProperty.newBuilder(table.getName());
          refNav.setRelationshipName(fk.getName());
          refNav.setFromToName(fk.getReferenceTableName(), table.getName());
          refNav.setRelationship(association);
          refNav.setFromTo(endRef, endSelf);
          refEntityType.addNavigationProperties(refNav);

          // build AssosiationSet
          EdmAssociationSet.Builder assosiationSet =
              EdmAssociationSet.newBuilder()
                  .setName(table.getName() + "_" + fk.getName())
                  .setAssociationName(fk.getName());

          // Build AssosiationSet Ends
          EdmAssociationSetEnd.Builder endOne =
              EdmAssociationSetEnd.newBuilder()
                  .setEntitySet(entitySet)
                  .setRoleName(table.getName())
                  .setRole(
                      EdmAssociationEnd.newBuilder()
                          .setType(entityType)
                          .setRole(entityType.getName()));

          EdmAssociationSetEnd.Builder endTwo =
              EdmAssociationSetEnd.newBuilder()
                  .setEntitySet(refEntitySet)
                  .setRoleName(fk.getReferenceTableName())
                  .setRole(
                      EdmAssociationEnd.newBuilder()
                          .setType(refEntityType)
                          .setRole(refEntityType.getName()));
          assosiationSet.setEnds(endOne, endTwo);

          assosiationSet.setAssociation(association);
          assosiationSets.add(assosiationSet);
        }
      }
      entityContainer.addAssociationSets(assosiationSets);
      odataSchema.addAssociations(assosiations);
    }
  }
  private static void buildEntityTypes(
      MetadataStore metadataStore, List<EdmSchema.Builder> edmSchemas) {
    for (Schema schema : metadataStore.getSchemaList()) {

      List<EdmEntitySet.Builder> entitySets = new ArrayList<EdmEntitySet.Builder>();
      List<EdmEntityType.Builder> entityTypes = new ArrayList<EdmEntityType.Builder>();

      for (Table table : schema.getTables().values()) {

        KeyRecord primaryKey = table.getPrimaryKey();
        List<KeyRecord> uniques = table.getUniqueKeys();
        if (primaryKey == null && uniques.isEmpty()) {
          LogManager.logDetail(
              LogConstants.CTX_ODATA,
              ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16002, table.getFullName()));
          continue;
        }

        EdmEntityType.Builder entityType =
            EdmEntityType.newBuilder().setName(table.getName()).setNamespace(schema.getName());

        // adding key
        if (primaryKey != null) {
          for (Column c : primaryKey.getColumns()) {
            entityType.addKeys(c.getName());
          }
        } else {
          for (Column c : uniques.get(0).getColumns()) {
            entityType.addKeys(c.getName());
          }
        }

        // adding properties
        for (Column c : table.getColumns()) {
          EdmProperty.Builder property =
              EdmProperty.newBuilder(c.getName())
                  .setType(ODataTypeManager.odataType(c.getDatatype().getRuntimeTypeName()))
                  .setNullable(c.getNullType() == NullType.Nullable);
          if (c.getDatatype()
              .getRuntimeTypeName()
              .equals(DataTypeManager.DefaultDataTypes.STRING)) {
            property.setFixedLength(c.isFixedLength()).setMaxLength(c.getLength()).setUnicode(true);
          }
          entityType.addProperties(property);
        }

        // entity set one for one entity type
        EdmEntitySet.Builder entitySet =
            EdmEntitySet.newBuilder().setName(table.getName()).setEntityType(entityType);

        entityType.setNamespace(schema.getName());
        entitySets.add(entitySet);

        // add enitity types for entity schema
        entityTypes.add(entityType);
      }

      // entity container is holder entity sets, association sets, function imports
      EdmEntityContainer.Builder entityContainer =
          EdmEntityContainer.newBuilder()
              .setName(schema.getName())
              .setIsDefault(false)
              .addEntitySets(entitySets);

      // build entity schema
      EdmSchema.Builder modelSchema =
          EdmSchema.newBuilder()
              .setNamespace(schema.getName())
              .addEntityTypes(entityTypes)
              .addEntityContainers(entityContainer);

      edmSchemas.add(modelSchema);
    }
  }