/
JSONConverter.java
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/
JSONConverter.java
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package com.purbon.kafka.connect.converters;
import com.fasterxml.jackson.core.JsonProcessingException;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.SchemaAndValue;
import org.apache.kafka.connect.errors.DataException;
import org.apache.kafka.connect.storage.Converter;
import org.apache.kafka.connect.storage.ConverterConfig;
import org.apache.kafka.connect.storage.ConverterType;
import org.apache.kafka.connect.storage.HeaderConverter;
import org.apache.kafka.connect.storage.StringConverterConfig;
public class JSONConverter implements Converter, HeaderConverter {
private JsonConverterConfig config;
private JSONUtils utils;
private DataTypeConverter converter;
@Override
public void close() {
//empty
}
@Override
public void configure(Map<String, ?> configs) {
this.config = new JsonConverterConfig(configs);
this.utils = new JSONUtils(config);
this.converter = new DataTypeConverter(config);
}
@Override
public void configure(Map<String, ?> configs, boolean isKey) {
Map<String, Object> conf = new HashMap<>(configs);
conf.put(StringConverterConfig.TYPE_CONFIG, isKey ? ConverterType.KEY.getName() : ConverterType.VALUE.getName());
configure(conf);
}
@Override
public byte[] fromConnectData(String topic, Schema schema, Object value) {
String jsonString = null;
try {
jsonString = JSONUtils.toString(value);
} catch (JsonProcessingException e) {
throw new DataException(e);
}
return Base64.getEncoder().encode(jsonString.getBytes());
}
@Override
public SchemaAndValue toConnectData(String topic, byte[] value) {
// This handles a tombstone message
if (value == null) {
return SchemaAndValue.NULL;
}
String jsonString = new String(value);
Schema schema = null;
try {
schema = utils.buildSchemaFromJSONString(jsonString);
} catch (JsonProcessingException e) {
e.printStackTrace();
throw new DataException(e);
}
try {
return new SchemaAndValue(schema,
converter.convertToConnect(schema, JSONUtils.toJsonNode(jsonString)));
} catch (JsonProcessingException e) {
e.printStackTrace();
throw new DataException("json with incorrect format");
}
}
@Override
public SchemaAndValue toConnectHeader(String topic, String headerKey, byte[] value) {
return toConnectData(topic, value);
}
@Override
public byte[] fromConnectHeader(String topic, String headerKey, Schema schema, Object value) {
return fromConnectData(topic, schema, value);
}
@Override
public ConfigDef config() {
return JsonConverterConfig.configDef();
}
}