Github user DT-Priyanka commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/211#discussion_r56300505
--- 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
+ */
+
+@InterfaceStability.Evolving
+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);
+
+ afi = columnFieldSetters.get(i);
+
+ SupportType st = afi.fieldInfo.getType();
+
+ Object val = null;
+
+ try {
+ val = tuple.get(afi.fieldInfo.getColumnName());
+ } catch (Exception e) {
+ LOG.error("Could not find field -" +
afi.fieldInfo.getColumnName() + "- in the generic record");
+ val = null;
+ fieldErrorCnt++;
+ }
+
+ if (val == null) {
+ continue;
+ }
+
+ try {
+
+ switch (st) {
+
+ case BOOLEAN:
+
+ afi.setterOrGetter = PojoUtils.createSetterBoolean(getCls(),
afi.fieldInfo.getPojoFieldExpression());
+
((PojoUtils.SetterBoolean<Object>)afi.setterOrGetter).set(newObj,
+ (boolean)tuple.get(afi.fieldInfo.getColumnName()));
+ break;
+
+ case DOUBLE:
+ afi.setterOrGetter = PojoUtils.createSetterDouble(getCls(),
afi.fieldInfo.getPojoFieldExpression());
+
((PojoUtils.SetterDouble<Object>)afi.setterOrGetter).set(newObj,
+ (double)tuple.get(afi.fieldInfo.getColumnName()));
+ break;
+
+ case FLOAT:
+ afi.setterOrGetter = PojoUtils.createSetterFloat(getCls(),
afi.fieldInfo.getPojoFieldExpression());
+
((PojoUtils.SetterFloat<Object>)afi.setterOrGetter).set(newObj,
+ (float)tuple.get(afi.fieldInfo.getColumnName()));
+ break;
+
+ case INTEGER:
+ afi.setterOrGetter = PojoUtils.createSetterInt(getCls(),
afi.fieldInfo.getPojoFieldExpression());
+ ((PojoUtils.SetterInt<Object>)afi.setterOrGetter).set(newObj,
+ (int)tuple.get(afi.fieldInfo.getColumnName()));
+ break;
+
+ case STRING:
+ afi.setterOrGetter = PojoUtils.createSetter(getCls(),
afi.fieldInfo.getPojoFieldExpression(),
+ afi.fieldInfo.getType().getJavaType());
+ ((PojoUtils.Setter<Object,
String>)afi.setterOrGetter).set(newObj,
+ new
String(tuple.get(afi.fieldInfo.getColumnName()).toString()));
+ break;
+
+ case LONG:
+ afi.setterOrGetter = PojoUtils.createSetterLong(getCls(),
afi.fieldInfo.getPojoFieldExpression());
+
((PojoUtils.SetterLong<Object>)afi.setterOrGetter).set(newObj,
+ (long)tuple.get(afi.fieldInfo.getColumnName()));
+ break;
+
+ default:
+ afi.setterOrGetter = PojoUtils.createSetter(getCls(),
afi.fieldInfo.getPojoFieldExpression(), Byte.class);
+ ((PojoUtils.Setter<Object,
byte[]>)afi.setterOrGetter).set(newObj,
+ serialize(tuple.get(afi.fieldInfo.getColumnName())));
+ break;
+
+ }
+
+ } catch (AvroRuntimeException | IOException e) {
+ LOG.error("Exception in setting value" + e.getMessage());
+ fieldErrorCnt++;
+ }
+
+ }
+ } catch (Exception ex) {
+ LOG.error("Generic Exception in setting value" + ex.getMessage());
+ errorCnt++;
+ }
+
+ return newObj;
+ }
+
+ /**
+ * Use reflection to generate field info values if the user has not
provided
+ * the inputs mapping
+ */
+
+ public String generateFieldInfoInputs(Class<?> cls)
+ {
+
+ java.lang.reflect.Field[] fields = cls.getDeclaredFields();
+
+ StringBuilder sb = new StringBuilder();
+
+ for (int i = 0; i < fields.length; i++) {
+
+ java.lang.reflect.Field f = fields[i];
+ Class<?> c = ClassUtils.primitiveToWrapper(f.getType());
+ sb.append(f.getName() + FIELD_SEPARATOR + f.getName() +
FIELD_SEPARATOR + c.getSimpleName().toUpperCase()
+ + RECORD_SEPARATOR);
+
+ }
+
+ return sb.substring(0, sb.length() - 1).toString();
+
+ }
+
+ public List<FieldInfo> createFieldInfoMap(String str)
+ {
+ fieldInfos = new ArrayList<FieldInfo>();
+
+ StringTokenizer strtok = new StringTokenizer(str, RECORD_SEPARATOR);
+
+ while (strtok.hasMoreTokens()) {
+ String[] token = strtok.nextToken().split(FIELD_SEPARATOR);
+
+ fieldInfos.add(new FieldInfo(token[0], token[1],
SupportType.valueOf(token[2])));
+ }
+
+ return fieldInfos;
+ }
+
+ @OutputPortFieldAnnotation(schemaRequired = true)
+ public final transient DefaultOutputPort<Object> output = new
DefaultOutputPort<Object>()
+ {
+ public void setup(PortContext context)
+ {
+ cls = context.getValue(Context.PortContext.TUPLE_CLASS);
+ }
+ };
+
+ @Override
+ public void setup(OperatorContext context)
+ {
+
+ columnFieldSetters = Lists.newArrayList();
+
+ try {
+ parseSchema();
+ } catch (IOException e) {
+ LOG.error("Exception in parsing schema");
+ }
+
+ if (getFieldInfos().isEmpty() || getGenericRecordToPOJOFieldsMapping()
== null) {
+ setFieldInfos(createFieldInfoMap(generateFieldInfoInputs(getCls())));
+ } else {
+
setFieldInfos(createFieldInfoMap(getGenericRecordToPOJOFieldsMapping()));
+ }
+
+ initColumnFieldSetters(getFieldInfos());
+
+ }
+
+ @Override
+ public void teardown()
+ {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void beginWindow(long windowId)
+ {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void endWindow()
+ {
+ errorCnt = 0;
+ fieldErrorCnt = 0;
+ recordCnt = 0;
+
+ }
+
+ public List<Field> getColumnNames()
+ {
+ return columnNames;
+ }
+
+ public void setColumnNames(List<Field> columnNames)
+ {
+ this.columnNames = columnNames;
+ }
+
+ public Class<?> getCls()
--- End diff --
Do we need this getter setter provided the class is initialized from
PortContext.TUPLE_CLASS
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