com.hazelcast.jet.sql.impl.extract.AvroQueryTarget Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.extract;
import com.hazelcast.internal.serialization.Data;
import com.hazelcast.sql.impl.extract.QueryExtractor;
import com.hazelcast.sql.impl.extract.QueryTarget;
import com.hazelcast.sql.impl.type.QueryDataType;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.util.Utf8;
import javax.annotation.concurrent.NotThreadSafe;
@NotThreadSafe
public class AvroQueryTarget implements QueryTarget {
private GenericRecord record;
@Override
public void setTarget(Object target, Data targetData) {
assert targetData == null;
record = (GenericRecord) target;
}
@Override
public QueryExtractor createExtractor(String path, QueryDataType type) {
return path == null ? createExtractor() : createFieldExtractor(path, type);
}
private QueryExtractor createExtractor() {
return () -> record;
}
private QueryExtractor createFieldExtractor(String path, QueryDataType type) {
return () -> type.convert(extractValue(record, path));
}
private static Object extractValue(GenericRecord record, String path) {
if (!record.hasField(path)) {
return null;
}
Object value = record.get(path);
if (value instanceof Utf8) {
return ((Utf8) value).toString();
} else {
return value;
}
}
}
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