/*
* 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.operators.testutils;
import org.apache.flink.runtime.util.ResettableMutableObjectIterator;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
public class CollectionIterator<T> implements ResettableMutableObjectIterator<T> {
private final Collection<T> collection;
private Iterator<T> iterator;
public CollectionIterator(Collection<T> collection) {
this.collection = collection;
this.iterator = collection.iterator();
}
@Override
public T next(T reuse) throws IOException {
return next();
}
@Override
public T next() throws IOException {
if (!iterator.hasNext()) {
return null;
} else {
return iterator.next();
}
}
@Override
public void reset() throws IOException {
iterator = collection.iterator();
}
public static <T> CollectionIterator<T> of(T... values) {
return new CollectionIterator<T>(Arrays.asList(values));
}
}