docs(samples): add bigtable filter snippet (#1762)

* docs(samples): add region tag and sample for filter snippets * lint fix * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md * refactor * lint fix * removed comment --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: Sita04

samples/snippets/src/main/java/com/example/bigtable/Filters.java

@@ -27,8 +27,10 @@
 import com.google.cloud.bigtable.data.v2.models.Row;
 import com.google.cloud.bigtable.data.v2.models.RowCell;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
+import java.util.Base64;
 
 public class Filters {
 
@@ -46,6 +48,7 @@ public static void filterLimitRowSample() {
  public static void filterLimitRowSample(String projectId, String instanceId, String tableId) {
  // A filter that matches cells from a row with probability .75
  Filter filter = FILTERS.key().sample(.75);
+ readRowFilter(projectId, instanceId, tableId, filter);
  readFilter(projectId, instanceId, tableId, filter);
  }
  // [END bigtable_filters_limit_row_sample]
@@ -67,6 +70,7 @@ public static void filterLimitRowRegex(String projectId, String instanceId, Stri
  // [END bigtable_filters_limit_row_regex]
 
  // [START bigtable_filters_limit_cells_per_col]
+ // [START bigtable_hw_create_filter]
  public static void filterLimitCellsPerCol() {
  // TODO(developer): Replace these variables before running the sample.
  String projectId = "my-project-id";
@@ -80,6 +84,7 @@ public static void filterLimitCellsPerCol(String projectId, String instanceId, S
  Filter filter = FILTERS.limit().cellsPerColumn(2);
  readFilter(projectId, instanceId, tableId, filter);
  }
+ // [END bigtable_hw_create_filter]
  // [END bigtable_filters_limit_cells_per_col]
 
  // [START bigtable_filters_limit_cells_per_row]
@@ -354,6 +359,25 @@ public static void filterComposingCondition(String projectId, String instanceId,
  // [END bigtable_filters_composing_condition]
  // [END_EXCLUDE]
 
+ // [START bigtable_hw_get_with_filter]
+ private static void readRowFilter(
+ String projectId, String instanceId, String tableId, Filter filter) {
+ // Initialize client that will be used to send requests. This client only needs to be created
+ // once, and can be reused for multiple requests.
+ try (BigtableDataClient dataClient = BigtableDataClient.create(projectId, instanceId)) {
+ String rowKey =
+ Base64.getEncoder().encodeToString("greeting0".getBytes(StandardCharsets.UTF_8));
+ Row row = dataClient.readRow(tableId, rowKey, filter);
+ printRow(row);
+ System.out.println("Row filter completed.");
+ } catch (IOException e) {
+ System.out.println(
+ "Unable to initialize service client, as a network error occurred: \n" + e);
+ }
+ }
+ // [END bigtable_hw_get_with_filter]
+
+ // [START bigtable_hw_scan_with_filter]
  private static void readFilter(
  String projectId, String instanceId, String tableId, Filter filter) {
  // Initialize client that will be used to send requests. This client only needs to be created
@@ -365,13 +389,19 @@ private static void readFilter(
  for (Row row : rows) {
  printRow(row);
  }
+ System.out.println("Table filter completed.");
  } catch (IOException e) {
  System.out.println(
- "Unable to initialize service client, as a network error occurred: \n" + e.toString());
+ "Unable to initialize service client, as a network error occurred: \n" + e);
  }
  }
+ // [END bigtable_hw_scan_with_filter]
 
+ // [START bigtable_print_row]
  private static void printRow(Row row) {
+ if (row == null) {
+ return;
+ }
  System.out.printf("Reading data for %s%n", row.getKey().toStringUtf8());
  String colFamily = "";
  for (RowCell cell : row.getCells()) {
@@ -390,5 +420,6 @@ private static void printRow(Row row) {
  }
  System.out.println();
  }
+ // [END bigtable_print_row]
 }
 // [END bigtable_filters_print]

samples/snippets/src/test/java/com/example/bigtable/FiltersTest.java

@@ -43,7 +43,8 @@ public void testFilterRowSample() {
  Filters.filterLimitRowSample(projectId, instanceId, TABLE_ID);
 
  String output = bout.toString();
- assertThat(output).contains("Reading data for");
+ assertThat(output).contains("Row filter completed.");
+ assertThat(output).contains("Table filter completed.");
  }
 
  @Test