org.apache.lucene.search: public class: CachingWrapperFilter

org.apache.lucene.search
public class: CachingWrapperFilter [javadoc | source]

java.lang.Object
   org.apache.lucene.search.Filter
      org.apache.lucene.search.CachingWrapperFilter

All Implemented Interfaces:
Serializable

Direct Known Subclasses:
QueryFilter

Wraps another filter's result and caches it. The purpose is to allow filters to simply filter, and then wrap with this class to add caching.

Field Summary
protected Filter	filter
protected transient Map	cache	A transient Filter cache. To cache Filters even when using RemoteSearchable use RemoteCachingWrapperFilter instead.

Constructor:

Constructor:
public CachingWrapperFilter(Filter filter) { this.filter = filter; } Parameters: `filter` - Filter to cache results of

 public CachingWrapperFilter(Filter filter) {
    this.filter = filter;
}

Parameters:

filter - Filter to cache results of

Method from org.apache.lucene.search.CachingWrapperFilter Summary:
bits, equals, hashCode, toString

Methods from org.apache.lucene.search.Filter:
bits

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.apache.lucene.search.CachingWrapperFilter Detail:
public BitSet bits(IndexReader reader) throws IOException { if (cache == null) { cache = new WeakHashMap(); } synchronized (cache) { // check cache BitSet cached = (BitSet) cache.get(reader); if (cached != null) { return cached; } } final BitSet bits = filter.bits(reader); synchronized (cache) { // update cache cache.put(reader, bits); } return bits; }
public boolean equals(Object o) { if (!(o instanceof CachingWrapperFilter)) return false; return this.filter.equals(((CachingWrapperFilter)o).filter); }
public int hashCode() { return filter.hashCode() ^ 0x1117BF25; }
public String toString() { return "CachingWrapperFilter("+filter+")"; }