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/**
* 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.hadoop.hive.serde2.objectinspector;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaStringObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorConverter;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableBinaryObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableBooleanObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableByteObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableDateObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableDoubleObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableFloatObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableHiveCharObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableHiveDecimalObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableHiveIntervalDayTimeObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableHiveIntervalYearMonthObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableHiveVarcharObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableIntObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableLongObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableShortObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.SettableTimestampObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.VoidObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableStringObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
/**
* ObjectInspectorConverters.
*
*/
public final class ObjectInspectorConverters {
/**
* A converter which will convert objects with one ObjectInspector to another.
*/
public static interface Converter {
Object convert(Object input);
}
/**
* IdentityConverter.
*
*/
public static class IdentityConverter implements Converter {
@Override
public Object convert(Object input) {
return input;
}
}
private static Converter getConverter(PrimitiveObjectInspector inputOI,
PrimitiveObjectInspector outputOI) {
switch (outputOI.getPrimitiveCategory()) {
case BOOLEAN:
return new PrimitiveObjectInspectorConverter.BooleanConverter(
inputOI,
(SettableBooleanObjectInspector) outputOI);
case BYTE:
return new PrimitiveObjectInspectorConverter.ByteConverter(
inputOI,
(SettableByteObjectInspector) outputOI);
case SHORT:
return new PrimitiveObjectInspectorConverter.ShortConverter(
inputOI,
(SettableShortObjectInspector) outputOI);
case INT:
return new PrimitiveObjectInspectorConverter.IntConverter(
inputOI,
(SettableIntObjectInspector) outputOI);
case LONG:
return new PrimitiveObjectInspectorConverter.LongConverter(
inputOI,
(SettableLongObjectInspector) outputOI);
case FLOAT:
return new PrimitiveObjectInspectorConverter.FloatConverter(
inputOI,
(SettableFloatObjectInspector) outputOI);
case DOUBLE:
return new PrimitiveObjectInspectorConverter.DoubleConverter(
inputOI,
(SettableDoubleObjectInspector) outputOI);
case STRING:
if (outputOI instanceof WritableStringObjectInspector) {
return new PrimitiveObjectInspectorConverter.TextConverter(
inputOI);
} else if (outputOI instanceof JavaStringObjectInspector) {
return new PrimitiveObjectInspectorConverter.StringConverter(
inputOI);
}
case CHAR:
return new PrimitiveObjectInspectorConverter.HiveCharConverter(
inputOI,
(SettableHiveCharObjectInspector) outputOI);
case VARCHAR:
return new PrimitiveObjectInspectorConverter.HiveVarcharConverter(
inputOI,
(SettableHiveVarcharObjectInspector) outputOI);
case DATE:
return new PrimitiveObjectInspectorConverter.DateConverter(
inputOI,
(SettableDateObjectInspector) outputOI);
case TIMESTAMP:
return new PrimitiveObjectInspectorConverter.TimestampConverter(
inputOI,
(SettableTimestampObjectInspector) outputOI);
case INTERVAL_YEAR_MONTH:
return new PrimitiveObjectInspectorConverter.HiveIntervalYearMonthConverter(
inputOI,
(SettableHiveIntervalYearMonthObjectInspector) outputOI);
case INTERVAL_DAY_TIME:
return new PrimitiveObjectInspectorConverter.HiveIntervalDayTimeConverter(
inputOI,
(SettableHiveIntervalDayTimeObjectInspector) outputOI);
case BINARY:
return new PrimitiveObjectInspectorConverter.BinaryConverter(
inputOI,
(SettableBinaryObjectInspector)outputOI);
case DECIMAL:
return new PrimitiveObjectInspectorConverter.HiveDecimalConverter(
inputOI,
(SettableHiveDecimalObjectInspector) outputOI);
default:
throw new RuntimeException("Hive internal error: conversion of "
+ inputOI.getTypeName() + " to " + outputOI.getTypeName()
+ " not supported yet.");
}
}
/**
* Returns a converter that converts objects from one OI to another OI. The
* returned (converted) object belongs to this converter, so that it can be
* reused across different calls.
*/
public static Converter getConverter(ObjectInspector inputOI,
ObjectInspector outputOI) {
// If the inputOI is the same as the outputOI, just return an
// IdentityConverter.
if (inputOI.equals(outputOI)) {
return new IdentityConverter();
}
switch (outputOI.getCategory()) {
case PRIMITIVE:
return getConverter((PrimitiveObjectInspector) inputOI, (PrimitiveObjectInspector) outputOI);
case STRUCT:
return new StructConverter(inputOI,
(SettableStructObjectInspector) outputOI);
case LIST:
return new ListConverter(inputOI,
(SettableListObjectInspector) outputOI);
case MAP:
return new MapConverter(inputOI,
(SettableMapObjectInspector) outputOI);
case UNION:
return new UnionConverter(inputOI,
(SettableUnionObjectInspector) outputOI);
default:
throw new RuntimeException("Hive internal error: conversion of "
+ inputOI.getTypeName() + " to " + outputOI.getTypeName()
+ " not supported yet.");
}
}
/*
* getConvertedOI with caching to store settable properties of the object
* inspector. Caching might help when the object inspector
* contains complex nested data types. Caching is not explicitly required for
* the returned object inspector across multiple invocations since the
* ObjectInspectorFactory already takes care of it.
*/
public static ObjectInspector getConvertedOI(
ObjectInspector inputOI, ObjectInspector outputOI,
Map oiSettableProperties
) {
return getConvertedOI(inputOI, outputOI, oiSettableProperties, true);
}
/*
* getConvertedOI without any caching.
*/
public static ObjectInspector getConvertedOI(
ObjectInspector inputOI,
ObjectInspector outputOI
) {
return getConvertedOI(inputOI, outputOI, null, true);
}
/**
* Utility function to convert from one object inspector type to another.
* The output object inspector type should have all fields as settableOI type.
* The above condition can be violated only if equalsCheck is true and inputOI is
* equal to outputOI.
* @param inputOI : input object inspector
* @param outputOI : output object inspector
* @param oiSettableProperties : The object inspector to isSettable mapping used to cache
* intermediate results.
* @param equalsCheck : Do we need to check if the inputOI and outputOI are the same?
* true : If they are the same, we return the object inspector directly.
* false : Do not perform an equality check on inputOI and outputOI
* @return : The output object inspector containing all settable fields. The return value
* can contain non-settable fields only if inputOI equals outputOI and equalsCheck is
* true.
*/
public static ObjectInspector getConvertedOI(
ObjectInspector inputOI,
ObjectInspector outputOI,
Map oiSettableProperties,
boolean equalsCheck) {
// 1. If equalsCheck is true and the inputOI is the same as the outputOI OR
// 2. If the outputOI has all fields settable, return it
if ((equalsCheck && inputOI.equals(outputOI)) ||
ObjectInspectorUtils.hasAllFieldsSettable(outputOI, oiSettableProperties) == true) {
return outputOI;
}
// Return the settable equivalent object inspector for primitive categories
// For eg: for table T containing partitions p1 and p2 (possibly different
// from the table T), return the settable inspector for T. The inspector for
// T is settable recursively i.e all the nested fields are also settable.
switch (outputOI.getCategory()) {
case PRIMITIVE:
// Create a writable object inspector for primitive type and return it.
PrimitiveObjectInspector primOutputOI = (PrimitiveObjectInspector) outputOI;
return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(
primOutputOI.getTypeInfo());
case STRUCT:
StructObjectInspector structOutputOI = (StructObjectInspector) outputOI;
// create a standard settable struct object inspector.
List listFields = structOutputOI.getAllStructFieldRefs();
List structFieldNames = new ArrayList(listFields.size());
List structFieldObjectInspectors = new ArrayList(
listFields.size());
for (StructField listField : listFields) {
structFieldNames.add(listField.getFieldName());
// We need to make sure that the underlying fields are settable as well.
// Hence, the recursive call for each field.
// Note that equalsCheck is false while invoking getConvertedOI() because
// we need to bypass the initial inputOI.equals(outputOI) check.
structFieldObjectInspectors.add(getConvertedOI(listField.getFieldObjectInspector(),
listField.getFieldObjectInspector(), oiSettableProperties, false));
}
return ObjectInspectorFactory.getStandardStructObjectInspector(
structFieldNames,
structFieldObjectInspectors);
case LIST:
ListObjectInspector listOutputOI = (ListObjectInspector) outputOI;
// We need to make sure that the list element type is settable.
return ObjectInspectorFactory.getStandardListObjectInspector(
getConvertedOI(listOutputOI.getListElementObjectInspector(),
listOutputOI.getListElementObjectInspector(), oiSettableProperties, false));
case MAP:
MapObjectInspector mapOutputOI = (MapObjectInspector) outputOI;
// We need to make sure that the key type and the value types are settable.
return ObjectInspectorFactory.getStandardMapObjectInspector(
getConvertedOI(mapOutputOI.getMapKeyObjectInspector(),
mapOutputOI.getMapKeyObjectInspector(), oiSettableProperties, false),
getConvertedOI(mapOutputOI.getMapValueObjectInspector(),
mapOutputOI.getMapValueObjectInspector(), oiSettableProperties, false));
case UNION:
UnionObjectInspector unionOutputOI = (UnionObjectInspector) outputOI;
// create a standard settable union object inspector
List unionListFields = unionOutputOI.getObjectInspectors();
List unionFieldObjectInspectors = new ArrayList(
unionListFields.size());
for (ObjectInspector listField : unionListFields) {
// We need to make sure that all the field associated with the union are settable.
unionFieldObjectInspectors.add(getConvertedOI(listField, listField, oiSettableProperties,
false));
}
return ObjectInspectorFactory.getStandardUnionObjectInspector(unionFieldObjectInspectors);
default:
// Unsupported in-memory structure.
throw new RuntimeException("Hive internal error: conversion of "
+ inputOI.getTypeName() + " to " + outputOI.getTypeName()
+ " not supported yet.");
}
}
/**
* A converter class for List.
*/
public static class ListConverter implements Converter {
ListObjectInspector inputOI;
SettableListObjectInspector outputOI;
ObjectInspector inputElementOI;
ObjectInspector outputElementOI;
ArrayList elementConverters;
Object output;
public ListConverter(ObjectInspector inputOI,
SettableListObjectInspector outputOI) {
if (inputOI instanceof ListObjectInspector) {
this.inputOI = (ListObjectInspector)inputOI;
this.outputOI = outputOI;
inputElementOI = this.inputOI.getListElementObjectInspector();
outputElementOI = outputOI.getListElementObjectInspector();
output = outputOI.create(0);
elementConverters = new ArrayList();
} else if (!(inputOI instanceof VoidObjectInspector)) {
throw new RuntimeException("Hive internal error: conversion of " +
inputOI.getTypeName() + " to " + outputOI.getTypeName() +
"not supported yet.");
}
}
@Override
public Object convert(Object input) {
if (input == null) {
return null;
}
// Create enough elementConverters
// NOTE: we have to have a separate elementConverter for each element,
// because the elementConverters can reuse the internal object.
// So it's not safe to use the same elementConverter to convert multiple
// elements.
int size = inputOI.getListLength(input);
while (elementConverters.size() < size) {
elementConverters.add(getConverter(inputElementOI, outputElementOI));
}
// Convert the elements
outputOI.resize(output, size);
for (int index = 0; index < size; index++) {
Object inputElement = inputOI.getListElement(input, index);
Object outputElement = elementConverters.get(index).convert(
inputElement);
outputOI.set(output, index, outputElement);
}
return output;
}
}
/**
* A converter class for Struct.
*/
public static class StructConverter implements Converter {
StructObjectInspector inputOI;
SettableStructObjectInspector outputOI;
List inputFields;
List outputFields;
ArrayList fieldConverters;
Object output;
public StructConverter(ObjectInspector inputOI,
SettableStructObjectInspector outputOI) {
if (inputOI instanceof StructObjectInspector) {
this.inputOI = (StructObjectInspector)inputOI;
this.outputOI = outputOI;
inputFields = this.inputOI.getAllStructFieldRefs();
outputFields = outputOI.getAllStructFieldRefs();
// If the output has some extra fields, set them to NULL.
int minFields = Math.min(inputFields.size(), outputFields.size());
fieldConverters = new ArrayList(minFields);
for (int f = 0; f < minFields; f++) {
fieldConverters.add(getConverter(inputFields.get(f)
.getFieldObjectInspector(), outputFields.get(f)
.getFieldObjectInspector()));
}
output = outputOI.create();
} else if (!(inputOI instanceof VoidObjectInspector)) {
throw new RuntimeException("Hive internal error: conversion of " +
inputOI.getTypeName() + " to " + outputOI.getTypeName() +
"not supported yet.");
}
}
@Override
public Object convert(Object input) {
if (input == null) {
return null;
}
int minFields = Math.min(inputFields.size(), outputFields.size());
// Convert the fields
for (int f = 0; f < minFields; f++) {
Object inputFieldValue = inputOI.getStructFieldData(input, inputFields.get(f));
Object outputFieldValue = fieldConverters.get(f).convert(inputFieldValue);
outputOI.setStructFieldData(output, outputFields.get(f), outputFieldValue);
}
// set the extra fields to null
for (int f = minFields; f < outputFields.size(); f++) {
outputOI.setStructFieldData(output, outputFields.get(f), null);
}
return output;
}
}
/**
* A converter class for Union.
*/
public static class UnionConverter implements Converter {
UnionObjectInspector inputOI;
SettableUnionObjectInspector outputOI;
// Object inspectors for the tags for the input and output unionss
List inputTagsOIs;
List outputTagsOIs;
ArrayList fieldConverters;
Object output;
public UnionConverter(ObjectInspector inputOI,
SettableUnionObjectInspector outputOI) {
if (inputOI instanceof UnionObjectInspector) {
this.inputOI = (UnionObjectInspector)inputOI;
this.outputOI = outputOI;
inputTagsOIs = this.inputOI.getObjectInspectors();
outputTagsOIs = outputOI.getObjectInspectors();
// If the output has some extra fields, set them to NULL in convert().
int minFields = Math.min(inputTagsOIs.size(), outputTagsOIs.size());
fieldConverters = new ArrayList(minFields);
for (int f = 0; f < minFields; f++) {
fieldConverters.add(getConverter(inputTagsOIs.get(f), outputTagsOIs.get(f)));
}
// Create an empty output object which will be populated when convert() is invoked.
output = outputOI.create();
} else if (!(inputOI instanceof VoidObjectInspector)) {
throw new RuntimeException("Hive internal error: conversion of " +
inputOI.getTypeName() + " to " + outputOI.getTypeName() +
"not supported yet.");
}
}
@Override
public Object convert(Object input) {
if (input == null) {
return null;
}
Object inputFieldValue = inputOI.getField(input);
Object inputFieldTag = inputOI.getTag(input);
Object outputFieldValue = null;
int inputFieldTagIndex = ((Byte)inputFieldTag).intValue();
if (inputFieldTagIndex >= 0 && inputFieldTagIndex < fieldConverters.size()) {
outputFieldValue = fieldConverters.get(inputFieldTagIndex).convert(inputFieldValue);
}
outputOI.addField(output, outputFieldValue);
return output;
}
}
/**
* A converter class for Map.
*/
public static class MapConverter implements Converter {
MapObjectInspector inputOI;
SettableMapObjectInspector outputOI;
ObjectInspector inputKeyOI;
ObjectInspector outputKeyOI;
ObjectInspector inputValueOI;
ObjectInspector outputValueOI;
ArrayList keyConverters;
ArrayList valueConverters;
Object output;
public MapConverter(ObjectInspector inputOI,
SettableMapObjectInspector outputOI) {
if (inputOI instanceof MapObjectInspector) {
this.inputOI = (MapObjectInspector)inputOI;
this.outputOI = outputOI;
inputKeyOI = this.inputOI.getMapKeyObjectInspector();
outputKeyOI = outputOI.getMapKeyObjectInspector();
inputValueOI = this.inputOI.getMapValueObjectInspector();
outputValueOI = outputOI.getMapValueObjectInspector();
keyConverters = new ArrayList();
valueConverters = new ArrayList();
output = outputOI.create();
} else if (!(inputOI instanceof VoidObjectInspector)) {
throw new RuntimeException("Hive internal error: conversion of " +
inputOI.getTypeName() + " to " + outputOI.getTypeName() +
"not supported yet.");
}
}
@Override
public Object convert(Object input) {
if (input == null) {
return null;
}
// Create enough keyConverters/valueConverters
// NOTE: we have to have a separate key/valueConverter for each key/value,
// because the key/valueConverters can reuse the internal object.
// So it's not safe to use the same key/valueConverter to convert multiple
// key/values.
// NOTE: This code tries to get all key-value pairs out of the map.
// It's not very efficient. The more efficient way should be to let MapOI
// return an Iterator. This is currently not supported by MapOI yet.
Map map = inputOI.getMap(input);
int size = map.size();
while (keyConverters.size() < size) {
keyConverters.add(getConverter(inputKeyOI, outputKeyOI));
valueConverters.add(getConverter(inputValueOI, outputValueOI));
}
// CLear the output
outputOI.clear(output);
// Convert the key/value pairs
int entryID = 0;
for (Map.Entry entry : map.entrySet()) {
Object inputKey = entry.getKey();
Object inputValue = entry.getValue();
Object outputKey = keyConverters.get(entryID).convert(inputKey);
Object outputValue = valueConverters.get(entryID).convert(inputValue);
entryID++;
outputOI.put(output, outputKey, outputValue);
}
return output;
}
}
private ObjectInspectorConverters() {
// prevent instantiation
}
}
