hadoop GSetByHashMap 源码
haddop GSetByHashMap 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/GSetByHashMap.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.util;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* A {@link GSet} implementation by {@link HashMap}.
*/
@InterfaceAudience.Private
public class GSetByHashMap<K, E extends K> implements GSet<K, E> {
private final HashMap<K, E> m;
public GSetByHashMap(int initialCapacity, float loadFactor) {
m = new HashMap<K, E>(initialCapacity, loadFactor);
}
@Override
public int size() {
return m.size();
}
@Override
public boolean contains(K k) {
return m.containsKey(k);
}
@Override
public E get(K k) {
return m.get(k);
}
@Override
public E put(E element) {
if (element == null) {
throw new UnsupportedOperationException("Null element is not supported.");
}
return m.put(element, element);
}
@Override
public E remove(K k) {
return m.remove(k);
}
@Override
public Iterator<E> iterator() {
return m.values().iterator();
}
@Override
public void clear() {
m.clear();
}
@Override
public Collection<E> values() {
return m.values();
}
}
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