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Data Mapper package is a high-performance data binding package built on Jackson JSON processor

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package org.codehaus.jackson.map.util;

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

/**
 * Helper for simple bounded LRU maps used for reusing lookup values.
 * 
 * @since 1.7
 */
@SuppressWarnings("serial")
public class LRUMap extends LinkedHashMap
{
    protected final int _maxEntries;
    
    public LRUMap(int initialEntries, int maxEntries)
    {
        super(initialEntries, 0.8f, true);
        _maxEntries = maxEntries;
    }

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

}