jaketf commented on a change in pull request #11151: [BEAM-9468]  Hl7v2 io
URL: https://github.com/apache/beam/pull/11151#discussion_r404366818
 
 

 ##########
 File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/healthcare/HealthcareIOErrorCoder.java
 ##########
 @@ -0,0 +1,54 @@
+/*
+ * 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.io.gcp.healthcare;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.CoderException;
+import org.apache.beam.sdk.coders.CustomCoder;
+import org.apache.beam.sdk.coders.NullableCoder;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+
+public class HealthcareIOErrorCoder<T> extends 
CustomCoder<HealthcareIOError<T>> {
+  private final Coder<T> originalCoder;
+  private static final NullableCoder<String> STRING_CODER = 
NullableCoder.of(StringUtf8Coder.of());
+
+  HealthcareIOErrorCoder(Coder<T> originalCoder) {
+    this.originalCoder = NullableCoder.of(originalCoder);
+  }
+
+  @Override
+  public void encode(HealthcareIOError<T> value, OutputStream outStream)
+      throws CoderException, IOException {
+
+    originalCoder.encode(value.getDataResource(), outStream);
+
 
 Review comment:
   Good Catch.
   We should serialize / deserialize observed time.
   

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