ce3fe692_collections__Lucene_3_6_0_API__Class_Summary_Description
[Class] LRUHashMap [Description] 
LRUHashMap is an extension of Java's HashMap, which has a bounded size(); When it reaches that size, each time a new element is added, the least recently used (LRU) entry is removed.
org.apache.lucene.util.collections (Lucene 3.6.0 API)
Description