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org.apache.hudi.avro.MercifulJsonConverter Maven / Gradle / Ivy
/*
* 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.hudi.avro;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.avro.Schema;
import org.apache.avro.Schema.Type;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericRecord;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.exception.HoodieException;
import org.apache.hudi.exception.HoodieIOException;
import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Converts Json record to Avro Generic Record.
*/
public class MercifulJsonConverter {
private static final Map FIELD_TYPE_PROCESSORS = getFieldTypeProcessors();
private final ObjectMapper mapper;
/**
* Build type processor map for each avro type.
*/
private static Map getFieldTypeProcessors() {
return Collections.unmodifiableMap(new HashMap() {
{
put(Type.STRING, generateStringTypeHandler());
put(Type.BOOLEAN, generateBooleanTypeHandler());
put(Type.DOUBLE, generateDoubleTypeHandler());
put(Type.FLOAT, generateFloatTypeHandler());
put(Type.INT, generateIntTypeHandler());
put(Type.LONG, generateLongTypeHandler());
put(Type.ARRAY, generateArrayTypeHandler());
put(Type.RECORD, generateRecordTypeHandler());
put(Type.ENUM, generateEnumTypeHandler());
put(Type.MAP, generateMapTypeHandler());
put(Type.BYTES, generateBytesTypeHandler());
put(Type.FIXED, generateFixedTypeHandler());
}
});
}
/**
* Uses a default objectMapper to deserialize a json string.
*/
public MercifulJsonConverter() {
this(new ObjectMapper());
}
/**
* Allows a configured ObjectMapper to be passed for converting json records to avro record.
*/
public MercifulJsonConverter(ObjectMapper mapper) {
this.mapper = mapper;
}
/**
* Converts json to Avro generic record.
*
* @param json Json record
* @param schema Schema
*/
public GenericRecord convert(String json, Schema schema) {
try {
Map jsonObjectMap = mapper.readValue(json, Map.class);
return convertJsonToAvro(jsonObjectMap, schema);
} catch (IOException e) {
throw new HoodieIOException(e.getMessage(), e);
}
}
private static GenericRecord convertJsonToAvro(Map inputJson, Schema schema) {
GenericRecord avroRecord = new GenericData.Record(schema);
for (Schema.Field f : schema.getFields()) {
Object val = inputJson.get(f.name());
if (val != null) {
avroRecord.put(f.pos(), convertJsonToAvroField(val, f.name(), f.schema()));
}
}
return avroRecord;
}
private static Schema getNonNull(Schema schema) {
List types = schema.getTypes();
Schema.Type firstType = types.get(0).getType();
return firstType.equals(Schema.Type.NULL) ? types.get(1) : types.get(0);
}
private static boolean isOptional(Schema schema) {
return schema.getType().equals(Schema.Type.UNION) && schema.getTypes().size() == 2
&& (schema.getTypes().get(0).getType().equals(Schema.Type.NULL)
|| schema.getTypes().get(1).getType().equals(Schema.Type.NULL));
}
private static Object convertJsonToAvroField(Object value, String name, Schema schema) {
if (isOptional(schema)) {
if (value == null) {
return null;
} else {
schema = getNonNull(schema);
}
} else if (value == null) {
// Always fail on null for non-nullable schemas
throw new HoodieJsonToAvroConversionException(null, name, schema);
}
JsonToAvroFieldProcessor processor = FIELD_TYPE_PROCESSORS.get(schema.getType());
if (null != processor) {
return processor.convertToAvro(value, name, schema);
}
throw new IllegalArgumentException("JsonConverter cannot handle type: " + schema.getType());
}
/**
* Base Class for converting json to avro fields.
*/
private abstract static class JsonToAvroFieldProcessor implements Serializable {
public Object convertToAvro(Object value, String name, Schema schema) {
Pair res = convert(value, name, schema);
if (!res.getLeft()) {
throw new HoodieJsonToAvroConversionException(value, name, schema);
}
return res.getRight();
}
protected abstract Pair convert(Object value, String name, Schema schema);
}
private static JsonToAvroFieldProcessor generateBooleanTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (value instanceof Boolean) {
return Pair.of(true, value);
}
return Pair.of(false, null);
}
};
}
private static JsonToAvroFieldProcessor generateIntTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (value instanceof Number) {
return Pair.of(true, ((Number) value).intValue());
} else if (value instanceof String) {
return Pair.of(true, Integer.valueOf((String) value));
}
return Pair.of(false, null);
}
};
}
private static JsonToAvroFieldProcessor generateDoubleTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (value instanceof Number) {
return Pair.of(true, ((Number) value).doubleValue());
} else if (value instanceof String) {
return Pair.of(true, Double.valueOf((String) value));
}
return Pair.of(false, null);
}
};
}
private static JsonToAvroFieldProcessor generateFloatTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (value instanceof Number) {
return Pair.of(true, ((Number) value).floatValue());
} else if (value instanceof String) {
return Pair.of(true, Float.valueOf((String) value));
}
return Pair.of(false, null);
}
};
}
private static JsonToAvroFieldProcessor generateLongTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (value instanceof Number) {
return Pair.of(true, ((Number) value).longValue());
} else if (value instanceof String) {
return Pair.of(true, Long.valueOf((String) value));
}
return Pair.of(false, null);
}
};
}
private static JsonToAvroFieldProcessor generateStringTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
return Pair.of(true, value.toString());
}
};
}
private static JsonToAvroFieldProcessor generateBytesTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
// Should return ByteBuffer (see GenericData.isBytes())
return Pair.of(true, ByteBuffer.wrap(value.toString().getBytes()));
}
};
}
private static JsonToAvroFieldProcessor generateFixedTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
// The ObjectMapper use List to represent FixedType
// eg: "decimal_val": [0, 0, 14, -63, -52] will convert to ArrayList
List converval = (List) value;
byte[] src = new byte[converval.size()];
for (int i = 0; i < converval.size(); i++) {
src[i] = converval.get(i).byteValue();
}
byte[] dst = new byte[schema.getFixedSize()];
System.arraycopy(src, 0, dst, 0, Math.min(schema.getFixedSize(), src.length));
return Pair.of(true, new GenericData.Fixed(schema, dst));
}
};
}
private static JsonToAvroFieldProcessor generateEnumTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
if (schema.getEnumSymbols().contains(value.toString())) {
return Pair.of(true, new GenericData.EnumSymbol(schema, value.toString()));
}
throw new HoodieJsonToAvroConversionException(String.format("Symbol %s not in enum", value.toString()),
schema.getFullName(), schema);
}
};
}
private static JsonToAvroFieldProcessor generateRecordTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
GenericRecord result = new GenericData.Record(schema);
return Pair.of(true, convertJsonToAvro((Map) value, schema));
}
};
}
private static JsonToAvroFieldProcessor generateArrayTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
Schema elementSchema = schema.getElementType();
List listRes = new ArrayList<>();
for (Object v : (List) value) {
listRes.add(convertJsonToAvroField(v, name, elementSchema));
}
return Pair.of(true, new GenericData.Array<>(schema, listRes));
}
};
}
private static JsonToAvroFieldProcessor generateMapTypeHandler() {
return new JsonToAvroFieldProcessor() {
@Override
public Pair convert(Object value, String name, Schema schema) {
Schema valueSchema = schema.getValueType();
Map mapRes = new HashMap<>();
for (Map.Entry v : ((Map) value).entrySet()) {
mapRes.put(v.getKey(), convertJsonToAvroField(v.getValue(), name, valueSchema));
}
return Pair.of(true, mapRes);
}
};
}
/**
* Exception Class for any schema conversion issue.
*/
public static class HoodieJsonToAvroConversionException extends HoodieException {
private Object value;
private String fieldName;
private Schema schema;
public HoodieJsonToAvroConversionException(Object value, String fieldName, Schema schema) {
this.value = value;
this.fieldName = fieldName;
this.schema = schema;
}
@Override
public String toString() {
return String.format("Json to Avro Type conversion error for field %s, %s for %s", fieldName, value, schema);
}
}
}
