Modify TableRow2EntityFn due to nullable values (#5)

pom.xml

@@ -22,7 +22,7 @@
 
   <groupId>com.github.yuiskw</groupId>
   <artifactId>bigquery-to-datastore</artifactId>
-  <version>0.1</version>
+  <version>0.2</version>
 
   <packaging>jar</packaging>
 

src/main/java/com/github/yuiskw/beam/TableRow2EntityFn.java

@@ -16,12 +16,20 @@
 import org.joda.time.LocalDateTime;
 
 
+/**
+ * This class is an Apache Beam function to convert TableRow to Entity.
+ */
 public class TableRow2EntityFn extends DoFn<TableRow, Entity> {
 
+  /** Google Cloud Platform project ID */
   private String projectId;
+  /** Google Datastore name space */
   private String namespace;
+  /** Google Datastore parent paths */
   private LinkedHashMap<String, String> parents;
+  /** Google Datastore kind name */
   private String kind;
+  /** BigQuery column for Google Datastore key */
   private String keyColumn;
 
   public TableRow2EntityFn(
@@ -49,6 +57,9 @@ public static Timestamp toTimestamp(Date date) {
     return timestamp;
   }
 
+  /**
+   * Convert TableRow to Entity
+   */
   @ProcessElement
   public void processElement(ProcessContext c) {
     try {
@@ -61,8 +72,16 @@ public void processElement(ProcessContext c) {
     }
   }
 
+  /**
+   * Convert an object to Datastore value
+   */
   public Value convertToDatastoreValue(Object value) {
     Value v = null;
+
+    if (value == null) {
+      return v;
+    }
+
     if (value instanceof java.lang.Boolean) {
       v = Value.newBuilder().setBooleanValue(((Boolean) value).booleanValue())
           .setExcludeFromIndexes(true).build();
@@ -140,13 +159,22 @@ else if (value instanceof Map) {
       Map<String, Object> struct = (Map<String, Object>) value;
       for (String subKey : struct.keySet()) {
         Value subV = convertToDatastoreValue(struct.get(subKey));
-        subEntityBuilder.putProperties(subKey, subV);
+        if (subV != null) {
+          subEntityBuilder.putProperties(subKey, subV);
+        }
       }
       v = Value.newBuilder().setEntityValue(subEntityBuilder.build()).build();
     }
     return v;
   }
 
+  /**
+   * Convert TableRow to Entity
+   *
+   * @param row TableRow of bigquery
+   * @return converted Entity
+   * @throws ParseException
+   */
   public Entity convertTableRowToEntity(TableRow row) throws ParseException {
     String keyName = row.get(keyColumn).toString();
     Key key = getKey(keyName);
@@ -196,6 +224,12 @@ public Key getKey(String name) {
     return keyBuilder.build();
   }
 
+  /**
+   * Parse integer value
+   *
+   * @param value String
+   * @return parsed integer of null if given value is not integer
+   */
   public static Integer parseInteger(String value) {
     Integer integer = null;
     try {

src/test/java/com/github/yuiskw/beam/BigQuery2DatastoreTest.java

@@ -41,6 +41,7 @@ public void testGetOptions() {
    SELECT
      "uuid1" AS uuid,
      False AS bool_value,
+     null AS nullable_value,
      1 AS int_value,
      1.23 AS float_value,
      "hoge" AS string_value,
@@ -58,16 +59,17 @@ public void testGetOptions() {
    UNION ALL
    SELECT
      "uuid2" AS uuid,
-     False AS bool_value,
+     True AS bool_value,
+     321 AS nullable_value,
      1 AS int_value,
      1.23 AS float_value,
      "hoge" AS string_value,
      CURRENT_DATE() AS date_value,
      CURRENT_TIME() AS time_value,
      CURRENT_TIMESTAMP() AS timestamp_value,
      [1, 2] AS int_array_value,
-     [1.23, 2.34, 3.45] AS float_array_value,
-     ["hoge", "fuga", "hoge2", "fuga2"] AS string_array_value,
+     [1.23, 2.34, 3.45, 4.56] AS float_array_value,
+     ["hoge", "fuga"] AS string_array_value,
      STRUCT(
      1 AS int_value,
      1.23 AS float_value,
@@ -94,9 +96,9 @@ public void testMain2() {
     String[] args = {
         "--project=test-project-id",
         "--inputBigQueryDataset=test_yu",
-        "--inputBigQueryTable=test_table",
+        "--inputBigQueryTable=table_table",
         "--outputDatastoreNamespace=test_double",
-        "--outputDatastoreKind=TestKind",
+        "--outputDatastoreKind=TestKind2",
         "--parentPaths=Parent1:p1,Parent2:p2",
         "--keyColumn=uuid",
         "--tempLocation=gs://test_yu/test-log/",