kafka MappedIterator 源码
kafka MappedIterator 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/utils/MappedIterator.java
/*
* 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.common.utils;
import java.util.Iterator;
import java.util.function.Function;
/**
* An iterator that maps another iterator's elements from type `F` to type `T`.
*/
public final class MappedIterator<F, T> implements Iterator<T> {
private final Iterator<? extends F> underlyingIterator;
private final Function<F, T> mapper;
public MappedIterator(Iterator<? extends F> underlyingIterator, Function<F, T> mapper) {
this.underlyingIterator = underlyingIterator;
this.mapper = mapper;
}
@Override
public final boolean hasNext() {
return underlyingIterator.hasNext();
}
@Override
public final T next() {
return mapper.apply(underlyingIterator.next());
}
}
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