[GitHub] [beam] reuvenlax commented on a change in pull request #11074: Store logical type values in Row instead of base values

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reuvenlax commented on a change in pull request #11074: Store logical type values in Row instead of base values
URL: https://github.com/apache/beam/pull/11074#discussion_r390764992
 
 

 ##########
 File path: sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/SchemaCoderHelpers.java
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 @@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.sdk.schemas;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import org.apache.beam.sdk.coders.BigDecimalCoder;
+import org.apache.beam.sdk.coders.BigEndianShortCoder;
+import org.apache.beam.sdk.coders.BooleanCoder;
+import org.apache.beam.sdk.coders.ByteArrayCoder;
+import org.apache.beam.sdk.coders.ByteCoder;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.CoderException;
+import org.apache.beam.sdk.coders.DoubleCoder;
+import org.apache.beam.sdk.coders.FloatCoder;
+import org.apache.beam.sdk.coders.InstantCoder;
+import org.apache.beam.sdk.coders.IterableCoder;
+import org.apache.beam.sdk.coders.ListCoder;
+import org.apache.beam.sdk.coders.MapCoder;
+import org.apache.beam.sdk.coders.NullableCoder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.coders.VarIntCoder;
+import org.apache.beam.sdk.coders.VarLongCoder;
+import org.apache.beam.sdk.schemas.Schema.FieldType;
+import org.apache.beam.sdk.schemas.Schema.LogicalType;
+import org.apache.beam.sdk.schemas.Schema.TypeName;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap;
+
+public class SchemaCoderHelpers {
+  // This contains a map of primitive types to their coders.
+  public static final Map<TypeName, Coder> CODER_MAP =
+      ImmutableMap.<TypeName, Coder>builder()
+          .put(TypeName.BYTE, ByteCoder.of())
+          .put(TypeName.BYTES, ByteArrayCoder.of())
+          .put(TypeName.INT16, BigEndianShortCoder.of())
+          .put(TypeName.INT32, VarIntCoder.of())
+          .put(TypeName.INT64, VarLongCoder.of())
+          .put(TypeName.DECIMAL, BigDecimalCoder.of())
+          .put(TypeName.FLOAT, FloatCoder.of())
+          .put(TypeName.DOUBLE, DoubleCoder.of())
+          .put(TypeName.STRING, StringUtf8Coder.of())
+          .put(TypeName.DATETIME, InstantCoder.of())
+          .put(TypeName.BOOLEAN, BooleanCoder.of())
+          .build();
+
+  private static class LogicalTypeCoder extends Coder {
+    private final LogicalType logicalType;
+    private final Coder baseTypeCoder;
+
+    public LogicalTypeCoder(LogicalType logicalType, Coder baseTypeCoder) {
+      this.logicalType = logicalType;
+      this.baseTypeCoder = baseTypeCoder;
+    }
+
+    @Override
+    public void encode(Object value, OutputStream outStream) throws CoderException, IOException {
+      Object baseType = logicalType.toBaseType(value);
+      baseTypeCoder.encode(baseType, outStream);
+    }
+
+    @Override
+    public Object decode(InputStream inStream) throws CoderException, IOException {
+      Object baseType = baseTypeCoder.decode(inStream);
+      return logicalType.toInputType(baseType);
+    }
+
+    @Override
+    public List<? extends Coder<?>> getCoderArguments() {
+      return Collections.emptyList();
+    }
+
+    @Override
+    public void verifyDeterministic() throws NonDeterministicException {
+      baseTypeCoder.verifyDeterministic();
+    }
+  }
+
+  /** Returns the coder used for a given primitive type. */
+  public static <T> Coder<T> coderForFieldType(FieldType fieldType) {
+    Coder<T> coder;
+    switch (fieldType.getTypeName()) {
+      case ROW:
+        coder = (Coder<T>) SchemaCoder.of(fieldType.getRowSchema());
+        break;
+      case ARRAY:
+        coder = (Coder<T>) ListCoder.of(coderForFieldType(fieldType.getCollectionElementType()));
+        break;
+      case ITERABLE:
+        coder =
+            (Coder<T>) IterableCoder.of(coderForFieldType(fieldType.getCollectionElementType()));
+        break;
+      case MAP:
+        coder =
+            (Coder<T>)
+                MapCoder.of(
+                    coderForFieldType(fieldType.getMapKeyType()),
+                    coderForFieldType(fieldType.getMapValueType()));
+        break;
+      case LOGICAL_TYPE:
+        coder =
+            new LogicalTypeCoder(
+                fieldType.getLogicalType(),
+                coderForFieldType(fieldType.getLogicalType().getBaseType()));
+        break;
+      default:
+        coder = (Coder<T>) CODER_MAP.get(fieldType.getTypeName());
 
 Review comment:
   Added  a null check.

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