refactor: Code readability [DHIS2-16705]

dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/table/JdbcTrackedEntityAnalyticsTableManager.java

@@ -30,6 +30,7 @@
 import static java.lang.String.join;
 import static java.util.stream.Collectors.groupingBy;
 import static org.apache.commons.collections4.CollectionUtils.emptyIfNull;
+import static org.apache.commons.collections4.CollectionUtils.isNotEmpty;
 import static org.hisp.dhis.analytics.AnalyticsTableType.TRACKED_ENTITY_INSTANCE;
 import static org.hisp.dhis.analytics.table.JdbcEventAnalyticsTableManager.EXPORTABLE_EVENT_STATUSES;
 import static org.hisp.dhis.analytics.util.AnalyticsUtils.getColumnType;
@@ -176,25 +177,27 @@ private List<AnalyticsTableColumn> getColumns(
         (Map<String, List<Program>>) params.getExtraParam("", PROGRAMS_BY_TET_KEY);
 
     List<AnalyticsTableColumn> columns = new ArrayList<>(getFixedColumns());
-
-    String enrolledInProgramExpression =
-        """
-        \s exists(select 1 from ${enrollment} en_0 \
-        where en_0.trackedentityid = te.trackedentityid \
-        and en_0.programid = ${programId})""";
-
-    emptyIfNull(programsByTetUid.get(trackedEntityType.getUid()))
-        .forEach(
-            program ->
-                columns.add(
-                    AnalyticsTableColumn.builder()
-                        .name(program.getUid())
-                        .dataType(BOOLEAN)
-                        .selectExpression(
-                            replaceQualify(
-                                enrolledInProgramExpression,
-                                Map.of("programId", String.valueOf(program.getId()))))
-                        .build()));
+    List<Program> programs = programsByTetUid.get(trackedEntityType.getUid());
+
+    if (isNotEmpty(programs)) {
+      String enrolledInProgramExpression =
+          """
+          \s exists(select 1 from ${enrollment} en_0 \
+          where en_0.trackedentityid = te.trackedentityid \
+          and en_0.programid = ${programId})""";
+
+      programs.forEach(
+          program ->
+              columns.add(
+                  AnalyticsTableColumn.builder()
+                      .name(program.getUid())
+                      .dataType(BOOLEAN)
+                      .selectExpression(
+                          replaceQualify(
+                              enrolledInProgramExpression,
+                              Map.of("programId", String.valueOf(program.getId()))))
+                      .build()));
+    }
 
     List<TrackedEntityAttribute> trackedEntityAttributes =
         getAllTrackedEntityAttributes(trackedEntityType, programsByTetUid)
@@ -271,7 +274,6 @@ private List<AnalyticsTableColumn> getFixedColumns() {
     columns.addAll(getOrganisationUnitLevelColumns());
     columns.add(getOrganisationUnitNameHierarchyColumn());
     columns.addAll(getFixedNonGroupByColumns());
-
     return columns;
   }
 
@@ -308,18 +310,23 @@ public void populateTable(AnalyticsTableUpdateParams params, AnalyticsTableParti
             left join analytics_rs_organisationunitgroupsetstructure ougs on te.organisationunitid=ougs.organisationunitid""",
             Map.of()));
 
-    ((List<TrackedEntityAttribute>)
-            params.getExtraParam(trackedEntityType.getUid(), ALL_NON_CONFIDENTIAL_TET_ATTRIBUTES))
-        .forEach(
-            tea ->
-                sql.append(
-                    replaceQualify(
-                        """
-                        \s left join ${trackedentityattributevalue} ${teaUid} on ${teaUid}.trackedentityid=te.trackedentityid \
-                        and ${teaUid}.trackedentityattributeid = ${teaId}""",
-                        Map.of(
-                            "teaUid", quote(tea.getUid()),
-                            "teaId", String.valueOf(tea.getId())))));
+    List<TrackedEntityAttribute> attributes =
+        ((List<TrackedEntityAttribute>)
+            params.getExtraParam(trackedEntityType.getUid(), ALL_NON_CONFIDENTIAL_TET_ATTRIBUTES));
+
+    if (isNotEmpty(attributes)) {
+      attributes.forEach(
+          tea ->
+              sql.append(
+                  replaceQualify(
+                      """
+                      \s left join ${trackedentityattributevalue} ${teaUid} on ${teaUid}.trackedentityid=te.trackedentityid \
+                      and ${teaUid}.trackedentityattributeid = ${teaId}""",
+                      Map.of(
+                          "teaUid", quote(tea.getUid()),
+                          "teaId", String.valueOf(tea.getId())))));
+    }
+
     sql.append(
         replaceQualify(
             """