org.apache.kafka.streams.state.internals.KeyValueToTimestampedKeyValueIteratorAdapter 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.state.internals;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.TimestampedBytesStore;
import static org.apache.kafka.streams.state.TimestampedBytesStore.convertToTimestampedFormat;
/**
* This class is used to ensure backward compatibility at DSL level between
* {@link org.apache.kafka.streams.state.TimestampedKeyValueStore} and
* {@link org.apache.kafka.streams.state.KeyValueStore}.
*
* @see KeyValueToTimestampedKeyValueByteStoreAdapter
*/
class KeyValueToTimestampedKeyValueIteratorAdapter implements KeyValueIterator, TimestampedBytesStore {
private final KeyValueIterator innerIterator;
KeyValueToTimestampedKeyValueIteratorAdapter(final KeyValueIterator innerIterator) {
this.innerIterator = innerIterator;
}
@Override
public void close() {
innerIterator.close();
}
@Override
public K peekNextKey() {
return innerIterator.peekNextKey();
}
@Override
public boolean hasNext() {
return innerIterator.hasNext();
}
@Override
public KeyValue next() {
final KeyValue plainKeyValue = innerIterator.next();
return KeyValue.pair(plainKeyValue.key, convertToTimestampedFormat(plainKeyValue.value));
}
}