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CamelTypeConverterTransform.java
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CamelTypeConverterTransform.java
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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.camel.kafkaconnector.transforms;
import java.util.Map;
import org.apache.camel.TypeConverter;
import org.apache.camel.kafkaconnector.utils.SchemaHelper;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.connect.connector.ConnectRecord;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.SchemaBuilder;
import org.apache.kafka.connect.errors.DataException;
import org.apache.kafka.connect.transforms.util.SchemaUtil;
import org.apache.kafka.connect.transforms.util.SimpleConfig;
public abstract class CamelTypeConverterTransform<R extends ConnectRecord<R>> extends CamelTransformSupport<R> {
public static final String FIELD_TARGET_TYPE_CONFIG = "target.type";
public static final ConfigDef CONFIG_DEF = new ConfigDef()
.define(FIELD_TARGET_TYPE_CONFIG, ConfigDef.Type.CLASS, null, ConfigDef.Importance.HIGH,
"The target field type to convert the value from, this is full qualified Java class, e.g: java.util.Map");
private static TypeConverter typeConverter;
private Class<?> fieldTargetType;
@Override
public R apply(R record) {
final Schema schema = operatingSchema(record);
final Object value = operatingValue(record);
final Object convertedValue = convertValueWithCamelTypeConverter(value);
final Schema updatedSchema = getOrBuildRecordSchema(schema, convertedValue);
return newRecord(record, updatedSchema, convertedValue);
}
private Object convertValueWithCamelTypeConverter(final Object originalValue) {
final Object convertedValue = typeConverter.tryConvertTo(fieldTargetType, originalValue);
if (convertedValue == null) {
throw new DataException(String.format("CamelTypeConverter was not able to convert value `%s` to target type of `%s`", originalValue, fieldTargetType.getSimpleName()));
}
return convertedValue;
}
private Schema getOrBuildRecordSchema(final Schema originalSchema, final Object value) {
final SchemaBuilder builder = SchemaUtil.copySchemaBasics(originalSchema, SchemaHelper.buildSchemaBuilderForType(value));
if (originalSchema.isOptional()) {
builder.optional();
}
if (originalSchema.defaultValue() != null) {
builder.defaultValue(convertValueWithCamelTypeConverter(originalSchema.defaultValue()));
}
return builder.build();
}
@Override
public ConfigDef config() {
return CONFIG_DEF;
}
@Override
public void close() {
}
@Override
public void configure(Map<String, ?> props) {
final SimpleConfig config = new SimpleConfig(CONFIG_DEF, props);
fieldTargetType = config.getClass(FIELD_TARGET_TYPE_CONFIG);
if (fieldTargetType == null) {
throw new ConfigException("Configuration 'target.type' can not be empty!");
}
// initialize type converter from camel context
typeConverter = getCamelContext().getTypeConverter();
}
protected abstract Schema operatingSchema(R record);
protected abstract Object operatingValue(R record);
protected abstract R newRecord(R record, Schema updatedSchema, Object updatedValue);
public static final class Key<R extends ConnectRecord<R>> extends CamelTypeConverterTransform<R> {
@Override
protected Schema operatingSchema(R record) {
return record.keySchema();
}
@Override
protected Object operatingValue(R record) {
return record.key();
}
@Override
protected R newRecord(R record, Schema updatedSchema, Object updatedValue) {
return record.newRecord(record.topic(), record.kafkaPartition(), updatedSchema, updatedValue, record.valueSchema(), record.value(), record.timestamp());
}
}
public static final class Value<R extends ConnectRecord<R>> extends CamelTypeConverterTransform<R> {
@Override
protected Schema operatingSchema(R record) {
return record.valueSchema();
}
@Override
protected Object operatingValue(R record) {
return record.value();
}
@Override
protected R newRecord(R record, Schema updatedSchema, Object updatedValue) {
return record.newRecord(record.topic(), record.kafkaPartition(), record.keySchema(), record.key(), updatedSchema, updatedValue, record.timestamp());
}
}
}