org.apache.flink.runtime.state.StateIteratorUtil 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.flink.runtime.state;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.types.Pair;
import java.io.IOException;
import java.util.Iterator;
/**
* Utils for state iterator-like operations.
*/
public class StateIteratorUtil {
public static Iterator createKeyIterator(
Iterator> innerIterator,
TypeSerializer keySerializer,
int stateNameByteLength
) {
return new Iterator() {
@Override
public boolean hasNext() {
return innerIterator.hasNext();
}
@Override
public K next() {
byte[] serializedKey = innerIterator.next().getKey();
try {
return StateSerializerUtil.getDeserializedKeyForKeyedValueState(
serializedKey,
keySerializer,
stateNameByteLength);
} catch (IOException e) {
throw new StateAccessException(e);
}
}
@Override
public void remove() {
innerIterator.remove();
}
};
}
}