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https://issues.apache.org/jira/browse/APEXMALHAR-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217634#comment-15217634
]
ASF GitHub Bot commented on APEXMALHAR-2011:
--------------------------------------------
Github user chinmaykolhatkar commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/211#discussion_r57850900
--- Diff:
contrib/src/main/java/com/datatorrent/contrib/avro/AvroRecordHelper.java ---
@@ -0,0 +1,120 @@
+/**
+ * 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 com.datatorrent.contrib.avro;
+
+import java.text.ParseException;
+import java.util.List;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.avro.Schema;
+import org.apache.avro.Schema.Type;
+
+/**
+ * This is an utility class for reading Avro converted records
+ */
+public class AvroRecordHelper
+{
+
+ /**
+ * Convert a passed String value to the given type for the key as per
Schema
+ */
+ public static Object convertValueStringToAvroKeyType(Schema schema,
String key, String value) throws ParseException
+ {
+ Type type = null;
+
+ if (schema.getField(key) != null) {
+ type = schema.getField(key).schema().getType();
+ } else {
+ return value;
+ }
+
+ Object convertedValue = null;
+
+ if (type == Type.UNION) {
+ convertedValue = convertAndResolveUnionToPrimitive(schema, key,
value);
+ } else {
+ convertedValue = convertValueToAvroPrimitive(type, key, value);
+ }
+
+ return convertedValue;
+
+ }
+
+ private static Object convertValueToAvroPrimitive(Type type, String key,
String value) throws ParseException
+ {
+ Object newValue = value;
+ switch (type) {
+ case BOOLEAN:
+ newValue = Boolean.parseBoolean(value);
+ break;
+ case DOUBLE:
+ newValue = Double.parseDouble(value);
+ break;
+ case FLOAT:
+ newValue = Float.parseFloat(value);
+ break;
+ case INT:
+ newValue = Integer.parseInt(value);
+ break;
+ case LONG:
+ newValue = Long.parseLong(value);
+ break;
+ case BYTES:
+ newValue = value.getBytes();
+ break;
+ case STRING:
+ newValue = value;
+ break;
+ case NULL:
+ newValue = null;
+ break;
+ default:
+ newValue = value;
+ }
+ return newValue;
+ }
+
+ private static Object convertAndResolveUnionToPrimitive(Schema schema,
String key, String value) throws ParseException
+ {
+ Schema unionSchema = schema.getField(key).schema();
+ List<Schema> types = unionSchema.getTypes();
+ Object convertedValue = null;
+ for (int i = 0; i < types.size(); i++) {
+ try {
+ if (types.get(i).getType() == Type.NULL) {
+ if (value == null || value.equals("null")) {
+ convertedValue = null;
+ break;
+ } else {
+ continue;
+ }
+ }
+ convertedValue =
convertValueToAvroPrimitive(types.get(i).getType(), key, value);
+ } catch (RuntimeException e) {
+ LOG.error("Could not handle schema resolution" + e.getMessage());
+ continue;
+ }
+ break;
+ }
+
+ return convertedValue;
+ }
+
+ static final Logger LOG =
LoggerFactory.getLogger(AvroRecordHelper.class);
--- End diff --
private
> POJO to Avro record converter
> -----------------------------
>
> Key: APEXMALHAR-2011
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2011
> Project: Apache Apex Malhar
> Issue Type: New Feature
> Reporter: devendra tagare
>
> We are looking to develop a record converter which would take a POJO as an
> input and emit a Generic record as the output based on the given Avro schema.
> The expected inputs for this operator would be,
> 1.Class Name of the incoming POJO
> 2.Avro schema for the Generic Record to emit.
> This operator would receive an Object on its input port and emit a Generic
> record on the output port.
> To start with, we would handle primitive types and then go on to handle
> complex types.
> Thanks,
> Dev
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