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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.List;
import java.util.Map;
import org.apache.hadoop.hive.serde2.objectinspector.ListObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.MapObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.io.Writable;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.serialization.SettingsAware;
import org.elasticsearch.hadoop.serialization.builder.ValueWriter;
import org.elasticsearch.hadoop.util.FieldAlias;
/**
* Main value writer for hive. However since Hive expects a Writable type to be passed to the record reader,
* the raw JSON data needs to be wrapped (and unwrapped by {@link HiveBytesArrayWritable}).
*/
public class HiveValueWriter implements SettingsAware, ValueWriter<HiveType> {
private final boolean writeUnknownTypes;
private final ValueWriter<Writable> writableWriter;
private FieldAlias alias;
public HiveValueWriter() {
this.writeUnknownTypes = false;
this.writableWriter = new HiveWritableValueWriter(false);
this.alias = new FieldAlias();
}
@Override
public boolean write(HiveType type, Generator generator) {
boolean result = write(type.getObject(), type.getObjectInspector(), generator);
return result;
}
private boolean write(Object data, ObjectInspector oi, Generator generator) {
if (data == null) {
generator.writeNull();
return true;
}
switch (oi.getCategory()) {
case PRIMITIVE:
Writable writable = (Writable) ((PrimitiveObjectInspector) oi).getPrimitiveWritableObject(data);
if (!writableWriter.write(writable, generator)) {
return false;
}
break;
case LIST: // or ARRAY
ListObjectInspector loi = (ListObjectInspector) oi;
generator.writeBeginArray();
for (int i = 0; i < loi.getListLength(data); i++) {
if (!write(loi.getListElement(data, i), loi.getListElementObjectInspector(), generator)) {
return false;
}
}
generator.writeEndArray();
break;
case MAP:
MapObjectInspector moi = (MapObjectInspector) oi;
generator.writeBeginObject();
for (Map.Entry<?, ?> entry : moi.getMap(data).entrySet()) {
//write(entry.getKey(), mapType.getMapKeyTypeInfo(), generator);
// TODO: handle non-strings
generator.writeFieldName(alias.toES(entry.getKey().toString()));
if (!write(entry.getValue(), moi.getMapValueObjectInspector(), generator)) {
return false;
}
}
generator.writeEndObject();
break;
case STRUCT:
StructObjectInspector soi = (StructObjectInspector) oi;
List<? extends StructField> refs = soi.getAllStructFieldRefs();
generator.writeBeginObject();
for (StructField structField : refs) {
generator.writeFieldName(alias.toES(structField.getFieldName()));
if (!write(soi.getStructFieldData(data, structField), structField.getFieldObjectInspector(), generator)) {
return false;
}
}
generator.writeEndObject();
break;
case UNION:
//UnionObjectInspector uoi = (UnionObjectInspector) oi;
throw new UnsupportedOperationException("union not yet supported");//break;
default:
if (writeUnknownTypes) {
return handleUnknown(data, oi, generator);
}
return false;
}
return true;
}
protected boolean handleUnknown(Object value, ObjectInspector oi, Generator generator) {
return false;
}
@Override
public void setSettings(Settings settings) {
alias = HiveUtils.alias(settings);
}
}