Decouple indexer from Document/Field impls
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Key: LUCENE-3177
URL: https://issues.apache.org/jira/browse/LUCENE-3177
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 4.0
Attachments: LUCENE-3177.patch
I think we should define minimal iterator interfaces,
IndexableDocument/Field, that indexer requires to index documents.
Indexer would consume only these bare minimum interfaces, not the
concrete Document/Field/FieldType classes from oal.document package.
Then, the Document/Field/FieldType hierarchy is one concrete impl of
these interfaces. Apps are free to make their own impls as well.
Maybe eventually we make another impl that enforces a global schema,
eg factored out of Solr's impl.
I think this frees design pressure on our Document/Field/FieldType
hierarchy, ie, these classes are free to become concrete
fully-featured "user-space" classes with all sorts of friendly sugar
APIs for adding/removing fields, getting/setting values, types, etc.,
but they don't need substantial extensibility/hierarchy. Ie, the
extensibility point shifts to IndexableDocument/Field interface.
I think this means we can collapse the three classes we now have for a
Field (Fieldable/AbstracField/Field) down to a single concrete class
(well, except for LUCENE-2308 where we want to break out dedicated
classes for different field types...).
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