private static void buildFunctionImports(MetadataStore metadataStore, List<Builder> edmSchemas) {
    for (Schema schema : metadataStore.getSchemaList()) {

      EdmSchema.Builder odataSchema = findSchema(edmSchemas, schema.getName());
      EdmEntityContainer.Builder entityContainer =
          findEntityContainer(edmSchemas, schema.getName());

      // procedures
      for (Procedure proc : schema.getProcedures().values()) {
        EdmFunctionImport.Builder edmProcedure = EdmFunctionImport.newBuilder();
        edmProcedure.setName(proc.getName());
        String httpMethod = "POST";

        for (ProcedureParameter pp : proc.getParameters()) {
          if (pp.getName().equals("return")) {
            httpMethod = "GET";
            edmProcedure.setReturnType(
                ODataTypeManager.odataType(pp.getDatatype().getRuntimeTypeName()));
            continue;
          }

          EdmFunctionParameter.Builder param = EdmFunctionParameter.newBuilder();
          param.setName(pp.getName());
          param.setType(ODataTypeManager.odataType(pp.getDatatype().getRuntimeTypeName()));

          if (pp.getType() == ProcedureParameter.Type.In) {
            param.setMode(Mode.In);
          } else if (pp.getType() == ProcedureParameter.Type.InOut) {
            param.setMode(Mode.InOut);
          } else if (pp.getType() == ProcedureParameter.Type.Out) {
            param.setMode(Mode.Out);
          }

          param.setNullable(pp.getNullType() == NullType.Nullable);
          edmProcedure.addParameters(param);
        }

        // add a complex type for return resultset.
        ColumnSet<Procedure> returnColumns = proc.getResultSet();
        if (returnColumns != null) {
          httpMethod = "GET";
          EdmComplexType.Builder complexType = EdmComplexType.newBuilder();
          complexType.setName(proc.getName() + "_" + returnColumns.getName());
          complexType.setNamespace(schema.getName());
          for (Column c : returnColumns.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);
            }
            complexType.addProperties(property);
          }
          odataSchema.addComplexTypes(complexType);
          edmProcedure.setIsCollection(true);
          edmProcedure.setReturnType(
              EdmCollectionType.newBuilder()
                  .setCollectionType(complexType)
                  .setKind(CollectionKind.Collection));
        }
        edmProcedure.setHttpMethod(httpMethod);
        entityContainer.addFunctionImports(edmProcedure);
      }
    }
  }
  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);
    }
  }