Default implementation of the resource cache for the default
ResourceManager. The cache uses a least recently used (LRU)
algorithm, with a maximum size specified via the
resource.manager.cache.size property (idenfied by the
org.apache.velocity.runtime.RuntimeConstants.RESOURCE_MANAGER_DEFAULTCACHE_SIZE constant). This property get be set to 0 or less for
a greedy, unbounded cache (the behavior from pre-v1.5).
author: Geir Magnusson Jr. author: Daniel Rall version: $Id: ResourceCacheImpl.java 463298 2006-10-12 16:10:32Z henning $