Expose DocValues via Fields
---------------------------
Key: LUCENE-2700
URL: https://issues.apache.org/jira/browse/LUCENE-2700
Project: Lucene - Java
Issue Type: New Feature
Components: Index
Reporter: Simon Willnauer
Assignee: Simon Willnauer
Fix For: CSF branch
DocValues Reader are currently exposed / accessed directly via IndexReader. To
integrate the new feature in a more "native" way we should expose the DocValues
via Fields on a perSegment level and on MultiFields in the multi reader case.
DocValues should be side by side with Fields.terms enabling access to Source,
SortedSource and ValuesEnum something like that:
{code}
public abstract class Fields {
...
public DocValues values();
}
public abstract class DocValues {
/** on disk enum based API */
public abstract ValuesEnum getEnum() throws IOException;
/** in memory Random Access API - with enum support - first call loads values
in ram*/
public abstract Source getSource() throws IOException;
/** sorted in memory Random Access API - optional operation */
public SortedSource getSortedSource(Comparator<BytesRef> comparator) throws
IOException, UnsupportedOperationException;
/** unloads previously loaded source only but keeps the doc values open */
public abstract unload();
/** closes the doc values */
public abstract close();
}
{code}
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