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core/src/main/java/hivemall/tools/list/UDAFToOrderedList.java
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core/src/main/java/hivemall/utils/collections/maps/BoundedSortedMap.java
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/* | ||
* 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 hivemall.utils.collections.maps; | ||
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import hivemall.utils.lang.Preconditions; | ||
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import java.util.Collections; | ||
import java.util.Map.Entry; | ||
import java.util.TreeMap; | ||
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import javax.annotation.CheckForNull; | ||
import javax.annotation.Nonnegative; | ||
import javax.annotation.Nullable; | ||
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public final class BoundedSortedMap<K, V> extends TreeMap<K, V> { | ||
private static final long serialVersionUID = 4580890152997313541L; | ||
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private final int bound; | ||
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public BoundedSortedMap(@Nonnegative int size) { | ||
this(size, false); | ||
} | ||
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public BoundedSortedMap(@Nonnegative int size, boolean reverseOrder) { | ||
super(reverseOrder ? Collections.reverseOrder() : null); | ||
Preconditions.checkArgument(size > 0, "size must be greater than zero: " + size); | ||
this.bound = size; | ||
} | ||
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@Nullable | ||
public V put(@CheckForNull final K key, @Nullable final V value) { | ||
final V old = super.put(key, value); | ||
if (size() > bound) { | ||
Entry<K, V> e = pollLastEntry(); | ||
if (e == null) { | ||
return null; | ||
} | ||
return e.getValue(); | ||
} | ||
return old; | ||
} | ||
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} |
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