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https://issues.apache.org/jira/browse/APEXMALHAR-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197058#comment-15197058
]
ASF GitHub Bot commented on APEXMALHAR-2011:
--------------------------------------------
Github user DT-Priyanka commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/211#discussion_r56300024
--- Diff:
contrib/src/main/java/com/datatorrent/contrib/avro/AvroToPojo.java ---
@@ -0,0 +1,428 @@
+/**
+ * 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.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.StringTokenizer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.avro.AvroRuntimeException;
+import org.apache.avro.Schema;
+import org.apache.avro.Schema.Field;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.commons.lang3.ClassUtils;
+import org.apache.hadoop.classification.InterfaceStability;
+
+import com.google.common.collect.Lists;
+
+import com.datatorrent.api.AutoMetric;
+import com.datatorrent.api.Context;
+import com.datatorrent.api.Context.OperatorContext;
+import com.datatorrent.api.Context.PortContext;
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.api.Operator;
+import com.datatorrent.api.annotation.InputPortFieldAnnotation;
+import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
+import com.datatorrent.lib.util.FieldInfo;
+import com.datatorrent.lib.util.FieldInfo.SupportType;
+import com.datatorrent.lib.util.PojoUtils;
+
+/**
+ * <p>
+ * AvroToPojo
+ * </p>
+ * A generic implementation for conversion from Avro to POJO. The POJO
class
+ * name & field mapping should be provided by the user. If this mapping is
not
+ * provided then reflection is used to determine this mapping. As of now
only
+ * primitive types are supported.
+ *
+ * @displayName Avro To Pojo
+ * @category Converter
+ * @tags avro
+ * @since 3.3.0
+ */
+
[email protected]
+public class AvroToPojo implements Operator
+{
+
+ private List<Field> columnNames;
+
+ private Class<?> cls;
+
+ private static final String FIELD_SEPARATOR = ":";
+ private static final String RECORD_SEPARATOR = ",";
+
+ private String genericRecordToPOJOFieldsMapping = null;
+
+ public String getGenericRecordToPOJOFieldsMapping()
+ {
+ return genericRecordToPOJOFieldsMapping;
+ }
+
+ public void setGenericRecordToPOJOFieldsMapping(String
genericRecordToPOJOFieldsMapping)
+ {
+ this.genericRecordToPOJOFieldsMapping =
genericRecordToPOJOFieldsMapping;
+ }
+
+ private String schemaFile;
+
+ private Schema schema;
+
+ private List<FieldInfo> fieldInfos;
+
+ private transient List<ActiveFieldInfo> columnFieldSetters = null;
+
+ @AutoMetric
+ int recordCnt = 0;
+
+ @AutoMetric
+ int errorCnt = 0;
+
+ @AutoMetric
+ int fieldErrorCnt = 0;
+
+ public void parseSchema() throws IOException
+ {
+ setSchema(new Schema.Parser().parse(getSchemaString()));
+ }
+
+ public String getSchemaString()
+ {
+ return schemaFile;
+ }
+
+ public void setSchemaString(String schemaFile)
+ {
+ this.schemaFile = schemaFile;
+ }
+
+ public Schema getSchema()
+ {
+ return schema;
+ }
+
+ public void setSchema(Schema schema)
+ {
+ this.schema = schema;
+ }
+
+ public byte[] serialize(Object obj) throws IOException
+ {
+ try (ByteArrayOutputStream b = new ByteArrayOutputStream()) {
+ try (ObjectOutputStream o = new ObjectOutputStream(b)) {
+ o.writeObject(obj);
+ }
+ return b.toByteArray();
+ }
+ }
+
+ @InputPortFieldAnnotation(optional = false)
+ public final transient DefaultInputPort<GenericRecord> data = new
DefaultInputPort<GenericRecord>()
+ {
+
+ @Override
+ public void process(GenericRecord tuple)
+ {
+
+ try {
+ Object obj = getPOJOFromGenericRecord(tuple, getCls());
+
+ if (obj != null) {
+ output.emit(obj);
+ recordCnt++;
+ }
+
+ } catch (InstantiationException | IllegalAccessException e) {
+ LOG.error("Could not initialize object of class - " +
getClass().getName());
+ errorCnt++;
+ }
+ }
+
+ };
+
+ @SuppressWarnings("unchecked")
+ public Object getPOJOFromGenericRecord(GenericRecord tuple, Class<?> cls)
+ throws InstantiationException, IllegalAccessException
+ {
+ Object newObj = getCls().newInstance();
+
+ try {
+
+ for (int i = 0; i < columnFieldSetters.size(); i++) {
+
+ AvroToPojo.ActiveFieldInfo afi = columnFieldSetters.get(i);
--- End diff --
Can you rename the variables to have meaningful names e.g. afi can be
fieldInfo or activeFieldInfo?
> 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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