org.apache.kafka.streams.kstream.internals.TransformerSupplierAdapter 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.kafka.streams.kstream.internals;
import java.util.Collections;
import java.util.Set;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.Transformer;
import org.apache.kafka.streams.kstream.TransformerSupplier;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.state.StoreBuilder;
public class TransformerSupplierAdapter implements TransformerSupplier>> {
private final TransformerSupplier> transformerSupplier;
public TransformerSupplierAdapter(final TransformerSupplier> transformerSupplier) {
this.transformerSupplier = transformerSupplier;
}
@Override
public Transformer>> get() {
return new Transformer>>() {
private final Transformer> transformer = transformerSupplier.get();
@Override
public void init(final ProcessorContext context) {
transformer.init(context);
}
@Override
public Iterable> transform(final KIn key, final VIn value) {
final KeyValue pair = transformer.transform(key, value);
if (pair != null) {
return Collections.singletonList(pair);
}
return Collections.emptyList();
}
@Override
public void close() {
transformer.close();
}
};
}
@Override
public Set> stores() {
return transformerSupplier.stores();
}
}