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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.hive;
import java.util.Locale;
import java.util.Map;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.io.NullWritable;
import org.elasticsearch.hadoop.EsHadoopIllegalArgumentException;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.serialization.field.ConstantFieldExtractor;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.StringUtils;
public class HiveFieldExtractor extends ConstantFieldExtractor {
private String fieldName;
@Override
protected Object extractField(Object target) {
if (target instanceof HiveType) {
HiveType type = (HiveType) target;
ObjectInspector inspector = type.getObjectInspector();
if (inspector instanceof StructObjectInspector) {
StructObjectInspector soi = (StructObjectInspector) inspector;
StructField field = soi.getStructFieldRef(fieldName);
ObjectInspector foi = field.getFieldObjectInspector();
Assert.isTrue(foi.getCategory() == ObjectInspector.Category.PRIMITIVE,
String.format("Field [%s] needs to be a primitive; found [%s]", fieldName, foi.getTypeName()));
// expecting a writeable - simply do a toString
Object data = soi.getStructFieldData(type.getObject(), field);
if (data == null || data instanceof NullWritable) {
return StringUtils.EMPTY;
}
return data.toString();
}
}
return null;
}
@Override
public void processField(Settings settings, String fl) {
Map<String, String> columnNames = HiveUtils.columnMap(settings);
// replace column name with _colX (which is what Hive uses during serialization)
fieldName = columnNames.get(fl.toLowerCase(Locale.ENGLISH));
if (!settings.getInputAsJson() && !StringUtils.hasText(fieldName)) {
throw new EsHadoopIllegalArgumentException(
String.format(
"Cannot find field [%s] in mapping %s ; maybe a value was specified without '<','>' or there is a typo?",
fl, columnNames.keySet()));
}
}
}