org.apache.flink.runtime.state.heap.HeapStorageIterator 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.heap;
import org.apache.flink.runtime.state.StorageIterator;
import org.apache.flink.runtime.state.heap.HeapStateStorage;
import org.apache.flink.types.Pair;
import org.apache.flink.util.Preconditions;
import java.util.Iterator;
import java.util.Map;
/**
* Implementation of {@link StorageIterator} for {@link HeapStateStorage}.
*/
public class HeapStorageIterator implements StorageIterator {
private final Iterator> iterator;
public HeapStorageIterator(Iterator> iterator) {
this.iterator = Preconditions.checkNotNull(iterator);
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public Pair next() {
return new HeapPair<>(iterator.next());
}
@Override
public void close() {
}
/**
* Implementation of {@link Pair}.
*/
public static class HeapPair implements Pair {
private final Map.Entry entry;
public HeapPair(Map.Entry entry) {
this.entry = Preconditions.checkNotNull(entry);
}
@Override
public K getKey() {
return entry.getKey();
}
@Override
public V getValue() {
return entry.getValue();
}
@Override
public V setValue(V value) {
return entry.setValue(value);
}
}
}