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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.kafka.streams.state.internals;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.ReadOnlyWindowStore;
import org.apache.kafka.streams.state.TimestampedWindowStore;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.apache.kafka.streams.state.WindowStoreIterator;
import java.time.Instant;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
public class ReadOnlyWindowStoreFacade implements ReadOnlyWindowStore {
protected final TimestampedWindowStore inner;
protected ReadOnlyWindowStoreFacade(final TimestampedWindowStore store) {
inner = store;
}
@Override
public V fetch(final K key,
final long time) {
return getValueOrNull(inner.fetch(key, time));
}
@Override
public WindowStoreIterator fetch(final K key,
final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new WindowStoreIteratorFacade<>(inner.fetch(key, timeFrom, timeTo));
}
@Override
public WindowStoreIterator backwardFetch(final K key,
final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new WindowStoreIteratorFacade<>(inner.backwardFetch(key, timeFrom, timeTo));
}
@Override
public KeyValueIterator, V> fetch(final K keyFrom,
final K keyTo,
final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new KeyValueIteratorFacade<>(inner.fetch(keyFrom, keyTo, timeFrom, timeTo));
}
@Override
public KeyValueIterator, V> backwardFetch(final K keyFrom,
final K keyTo,
final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new KeyValueIteratorFacade<>(inner.backwardFetch(keyFrom, keyTo, timeFrom, timeTo));
}
@Override
public KeyValueIterator, V> fetchAll(final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new KeyValueIteratorFacade<>(inner.fetchAll(timeFrom, timeTo));
}
@Override
public KeyValueIterator, V> backwardFetchAll(final Instant timeFrom,
final Instant timeTo) throws IllegalArgumentException {
return new KeyValueIteratorFacade<>(inner.backwardFetchAll(timeFrom, timeTo));
}
@Override
public KeyValueIterator, V> all() {
return new KeyValueIteratorFacade<>(inner.all());
}
@Override
public KeyValueIterator, V> backwardAll() {
return new KeyValueIteratorFacade<>(inner.backwardAll());
}
private static class WindowStoreIteratorFacade implements WindowStoreIterator {
final KeyValueIterator> innerIterator;
WindowStoreIteratorFacade(final KeyValueIterator> iterator) {
innerIterator = iterator;
}
@Override
public void close() {
innerIterator.close();
}
@Override
public Long peekNextKey() {
return innerIterator.peekNextKey();
}
@Override
public boolean hasNext() {
return innerIterator.hasNext();
}
@Override
public KeyValue next() {
final KeyValue> innerKeyValue = innerIterator.next();
return KeyValue.pair(innerKeyValue.key, getValueOrNull(innerKeyValue.value));
}
}
}