Move FieldCache to IndexReader
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Key: LUCENE-3360
URL: https://issues.apache.org/jira/browse/LUCENE-3360
Project: Lucene - Java
Issue Type: Improvement
Reporter: Martijn van Groningen
Fix For: 4.0
Move the static FieldCache.DEFAULT field instance to atomic IndexReaders, so
that FieldCache insanity caused by the WeakHashMap no longer occurs.
* Add a new method to IndexReader that by default throws an UOE:
{code}public FieldCache getFieldCache(){code}
* The SegmentReader implements this method and returns its own internal
FieldCache implementation. This implementation just uses a
HashMap<Entry<T>,Object>> to store entries.
* The SlowMultiReaderWrapper implements this method as well and basically
behaves the same as the current FieldCacheImpl.
This issue won't solve the insanity that comes from inconsistent usage of a
single field (for example retrieve both int[] and DocTermIndex for the same
field).
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