hadoop MarkableIterator 源码
haddop MarkableIterator 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MarkableIterator.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.hadoop.mapreduce;
import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* <code>MarkableIterator</code> is a wrapper iterator class that
* implements the {@link MarkableIteratorInterface}.
*
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MarkableIterator<VALUE>
implements MarkableIteratorInterface<VALUE> {
MarkableIteratorInterface<VALUE> baseIterator;
/**
* Create a new iterator layered on the input iterator
* @param itr underlying iterator that implements MarkableIteratorInterface
*/
public MarkableIterator(Iterator<VALUE> itr) {
if (!(itr instanceof MarkableIteratorInterface)) {
throw new IllegalArgumentException("Input Iterator not markable");
}
baseIterator = (MarkableIteratorInterface<VALUE>) itr;
}
@Override
public void mark() throws IOException {
baseIterator.mark();
}
@Override
public void reset() throws IOException {
baseIterator.reset();
}
@Override
public void clearMark() throws IOException {
baseIterator.clearMark();
}
@Override
public boolean hasNext() {
return baseIterator.hasNext();
}
@Override
public VALUE next() {
return baseIterator.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException("Remove Not Implemented");
}
}
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