| /** |
| * 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.sqoop.mapreduce; |
| |
| import org.apache.sqoop.lib.SqoopRecord; |
| import org.apache.sqoop.orm.ClassWriter; |
| import org.apache.avro.Conversions; |
| import org.apache.avro.Schema; |
| import org.apache.avro.generic.GenericData; |
| import org.apache.avro.generic.GenericRecord; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.DefaultStringifier; |
| import org.apache.hadoop.io.MapWritable; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.sqoop.avro.AvroUtil; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * Exports records (type GenericRecord) from a data source. |
| */ |
| public class GenericRecordExportMapper<K, V> |
| extends AutoProgressMapper<K, V, SqoopRecord, NullWritable> { |
| |
| public static final String AVRO_COLUMN_TYPES_MAP = "sqoop.avro.column.types.map"; |
| |
| protected MapWritable columnTypes; |
| |
| private SqoopRecord recordImpl; |
| |
| @Override |
| protected void setup(Context context) throws IOException, InterruptedException { |
| super.setup(context); |
| |
| Configuration conf = context.getConfiguration(); |
| |
| // Instantiate a copy of the user's class to hold and parse the record. |
| String recordClassName = conf.get( |
| ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY); |
| if (null == recordClassName) { |
| throw new IOException("Export table class name (" |
| + ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY |
| + ") is not set!"); |
| } |
| |
| try { |
| Class cls = Class.forName(recordClassName, true, |
| Thread.currentThread().getContextClassLoader()); |
| recordImpl = (SqoopRecord) ReflectionUtils.newInstance(cls, conf); |
| } catch (ClassNotFoundException cnfe) { |
| throw new IOException(cnfe); |
| } |
| |
| if (null == recordImpl) { |
| throw new IOException("Could not instantiate object of type " |
| + recordClassName); |
| } |
| |
| columnTypes = DefaultStringifier.load(conf, AVRO_COLUMN_TYPES_MAP, |
| MapWritable.class); |
| |
| // Add decimal support |
| GenericData.get().addLogicalTypeConversion(new Conversions.DecimalConversion()); |
| } |
| |
| protected SqoopRecord toSqoopRecord(GenericRecord record) throws IOException { |
| Schema avroSchema = record.getSchema(); |
| for (Map.Entry<Writable, Writable> e : columnTypes.entrySet()) { |
| String columnName = e.getKey().toString(); |
| String columnType = e.getValue().toString(); |
| String cleanedCol = ClassWriter.toIdentifier(columnName); |
| Schema.Field field = getFieldIgnoreCase(avroSchema, cleanedCol); |
| if (null == field) { |
| throw new IOException("Cannot find field " + cleanedCol |
| + " in Avro schema " + avroSchema); |
| } |
| |
| Object avroObject = record.get(field.name()); |
| Object fieldVal = AvroUtil.fromAvro(avroObject, field.schema(), columnType); |
| recordImpl.setField(cleanedCol, fieldVal); |
| } |
| return recordImpl; |
| } |
| |
| private static Schema.Field getFieldIgnoreCase(Schema avroSchema, |
| String fieldName) { |
| for (Schema.Field field : avroSchema.getFields()) { |
| if (field.name().equalsIgnoreCase(fieldName)) { |
| return field; |
| } |
| } |
| return null; |
| } |
| |
| } |