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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.parquet.proto;
import com.google.protobuf.ByteString;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import com.twitter.elephantbird.util.Protobufs;
import org.apache.parquet.column.Dictionary;
import org.apache.parquet.io.InvalidRecordException;
import org.apache.parquet.io.api.Binary;
import org.apache.parquet.io.api.Converter;
import org.apache.parquet.io.api.GroupConverter;
import org.apache.parquet.io.api.PrimitiveConverter;
import org.apache.parquet.schema.GroupType;
import org.apache.parquet.schema.IncompatibleSchemaModificationException;
import org.apache.parquet.schema.Type;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.google.protobuf.Descriptors.FieldDescriptor.JavaType;
/**
* Converts Protocol Buffer message (both top level and inner) to parquet.
* This is internal class, use {@link ProtoRecordConverter}.
*
* @see {@link ProtoWriteSupport}
* @author Lukas Nalezenec
*/
class ProtoMessageConverter extends GroupConverter {
private final Converter[] converters;
private final ParentValueContainer parent;
private final Message.Builder myBuilder;
// used in record converter
ProtoMessageConverter(ParentValueContainer pvc, Class protoClass, GroupType parquetSchema) {
this(pvc, Protobufs.getMessageBuilder(protoClass), parquetSchema);
}
// For usage in message arrays
ProtoMessageConverter(ParentValueContainer pvc, Message.Builder builder, GroupType parquetSchema) {
int schemaSize = parquetSchema.getFieldCount();
converters = new Converter[schemaSize];
this.parent = pvc;
int parquetFieldIndex = 1;
if (pvc == null) {
throw new IllegalStateException("Missing parent value container");
}
myBuilder = builder;
Descriptors.Descriptor protoDescriptor = builder.getDescriptorForType();
for (Type parquetField : parquetSchema.getFields()) {
Descriptors.FieldDescriptor protoField = protoDescriptor.findFieldByName(parquetField.getName());
if (protoField == null) {
String description = "Scheme mismatch \n\"" + parquetField + "\"" +
"\n proto descriptor:\n" + protoDescriptor.toProto();
throw new IncompatibleSchemaModificationException("Cant find \"" + parquetField.getName() + "\" " + description);
}
converters[parquetFieldIndex - 1] = newMessageConverter(myBuilder, protoField, parquetField);
parquetFieldIndex++;
}
}
@Override
public Converter getConverter(int fieldIndex) {
return converters[fieldIndex];
}
@Override
public void start() {
}
@Override
public void end() {
parent.add(myBuilder.build());
myBuilder.clear();
}
private Converter newMessageConverter(final Message.Builder parentBuilder, final Descriptors.FieldDescriptor fieldDescriptor, Type parquetType) {
boolean isRepeated = fieldDescriptor.isRepeated();
ParentValueContainer parent;
if (isRepeated) {
parent = new ParentValueContainer() {
@Override
public void add(Object value) {
parentBuilder.addRepeatedField(fieldDescriptor, value);
}
};
} else {
parent = new ParentValueContainer() {
@Override
public void add(Object value) {
parentBuilder.setField(fieldDescriptor, value);
}
};
}
return newScalarConverter(parent, parentBuilder, fieldDescriptor, parquetType);
}
private Converter newScalarConverter(ParentValueContainer pvc, Message.Builder parentBuilder, Descriptors.FieldDescriptor fieldDescriptor, Type parquetType) {
JavaType javaType = fieldDescriptor.getJavaType();
switch (javaType) {
case STRING: return new ProtoStringConverter(pvc);
case FLOAT: return new ProtoFloatConverter(pvc);
case DOUBLE: return new ProtoDoubleConverter(pvc);
case BOOLEAN: return new ProtoBooleanConverter(pvc);
case BYTE_STRING: return new ProtoBinaryConverter(pvc);
case ENUM: return new ProtoEnumConverter(pvc, fieldDescriptor);
case INT: return new ProtoIntConverter(pvc);
case LONG: return new ProtoLongConverter(pvc);
case MESSAGE: {
Message.Builder subBuilder = parentBuilder.newBuilderForField(fieldDescriptor);
return new ProtoMessageConverter(pvc, subBuilder, parquetType.asGroupType());
}
}
throw new UnsupportedOperationException(String.format("Cannot convert type: %s" +
" (Parquet type: %s) ", javaType, parquetType));
}
public Message.Builder getBuilder() {
return myBuilder;
}
static abstract class ParentValueContainer {
/**
* Adds the value to the parent.
*/
public abstract void add(Object value);
}
final class ProtoEnumConverter extends PrimitiveConverter {
private final Descriptors.FieldDescriptor fieldType;
private final Map enumLookup;
private Descriptors.EnumValueDescriptor[] dict;
private final ParentValueContainer parent;
public ProtoEnumConverter(ParentValueContainer parent, Descriptors.FieldDescriptor fieldType) {
this.parent = parent;
this.fieldType = fieldType;
this.enumLookup = makeLookupStructure(fieldType);
}
/**
* Fills lookup structure for translating between parquet enum values and Protocol buffer enum values.
* */
private Map makeLookupStructure(Descriptors.FieldDescriptor enumFieldType) {
Descriptors.EnumDescriptor enumType = enumFieldType.getEnumType();
Map lookupStructure = new HashMap();
List enumValues = enumType.getValues();
for (Descriptors.EnumValueDescriptor value : enumValues) {
String name = value.getName();
lookupStructure.put(Binary.fromString(name), enumType.findValueByName(name));
}
return lookupStructure;
}
/**
* Translates given parquet enum value to protocol buffer enum value.
* @throws org.apache.parquet.io.InvalidRecordException is there is no corresponding value.
* */
private Descriptors.EnumValueDescriptor translateEnumValue(Binary binaryValue) {
Descriptors.EnumValueDescriptor protoValue = enumLookup.get(binaryValue);
if (protoValue == null) {
Set knownValues = enumLookup.keySet();
String msg = "Illegal enum value \"" + binaryValue + "\""
+ " in protocol buffer \"" + fieldType.getFullName() + "\""
+ " legal values are: \"" + knownValues + "\"";
throw new InvalidRecordException(msg);
}
return protoValue;
}
@Override
final public void addBinary(Binary binaryValue) {
Descriptors.EnumValueDescriptor protoValue = translateEnumValue(binaryValue);
parent.add(protoValue);
}
@Override
public void addValueFromDictionary(int dictionaryId) {
parent.add(dict[dictionaryId]);
}
@Override
public boolean hasDictionarySupport() {
return true;
}
@Override
public void setDictionary(Dictionary dictionary) {
dict = new Descriptors.EnumValueDescriptor[dictionary.getMaxId() + 1];
for (int i = 0; i <= dictionary.getMaxId(); i++) {
Binary binaryValue = dictionary.decodeToBinary(i);
dict[i] = translateEnumValue(binaryValue);
}
}
}
final class ProtoBinaryConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoBinaryConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addBinary(Binary binary) {
ByteString byteString = ByteString.copyFrom(binary.toByteBuffer());
parent.add(byteString);
}
}
final class ProtoBooleanConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoBooleanConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
final public void addBoolean(boolean value) {
parent.add(value);
}
}
final class ProtoDoubleConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoDoubleConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addDouble(double value) {
parent.add(value);
}
}
final class ProtoFloatConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoFloatConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addFloat(float value) {
parent.add(value);
}
}
final class ProtoIntConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoIntConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addInt(int value) {
parent.add(value);
}
}
final class ProtoLongConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoLongConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addLong(long value) {
parent.add(value);
}
}
final class ProtoStringConverter extends PrimitiveConverter {
final ParentValueContainer parent;
public ProtoStringConverter(ParentValueContainer parent) {
this.parent = parent;
}
@Override
public void addBinary(Binary binary) {
String str = binary.toStringUsingUTF8();
parent.add(str);
}
}
}
