net.java.ao.LRUMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of activeobjects Show documentation

This is the full Active Objects library, if you don't know which one to use, you probably want this one.

The newest version!

package net.java.ao; /**
 * 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.
 */

/**
 *
 */

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * LifoSet - Set interface wrapper around a LinkedList
 *
 * This class is copied verbatim from the ofbiz trunk as of r791212 of trunk from org.ofbiz.base.util.collections;
 */
@SuppressWarnings("serial")
class LRUMap extends LinkedHashMap {
    private int maxSize;

    public LRUMap() {
        this(10);
    }

    public LRUMap(int size) {
        this(size, 16);
    }

    public LRUMap(int size, int initialCapacity) {
        this(size, initialCapacity, (float) .75);
    }

    public LRUMap(int size, int initialCapacity, float loadFactor) {
        super(initialCapacity, loadFactor, true);
        maxSize = size;
    }

    /**
     * Sets the max capacity for this LRUMap
     *
     * @param size Max Size (as integer)
     */
    public void setMaxSize(int size) {
        this.maxSize = size;
    }

    @Override
    protected boolean removeEldestEntry(Map.Entry entry) {
        return size() > maxSize;
    }
}