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https://issues.apache.org/jira/browse/LUCENE-4541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491262#comment-13491262
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David Smiley commented on LUCENE-4541:
--------------------------------------
{code:java}
public class ValueSourceAccessor {
// implement FunctionValues ?
private final List<AtomicReaderContext> readerContexts;
private final FunctionValues[] docValuesArr;
private final ValueSource valueSource;
private final Map fContext;
private int localId;
private FunctionValues values;
public ValueSourceAccessor(IndexSearcher searcher, ValueSource valueSource)
{
readerContexts = searcher.getIndexReader().leaves();
this.valueSource = valueSource;
docValuesArr = new FunctionValues[readerContexts.size()];
fContext = ValueSource.newContext(searcher);
}
private void setState(int docid) throws IOException {
int idx = ReaderUtil.subIndex(docid, readerContexts);
AtomicReaderContext rcontext = readerContexts.get(idx);
values = docValuesArr[idx];
if (values == null) {
docValuesArr[idx] = values = valueSource.getValues(fContext, rcontext);
}
localId = docid - rcontext.docBase;
}
public double doubleVal(int docid) throws IOException {
setState(docid);
return values.doubleVal(localId);
}
public Object objectVal(int docid) throws IOException {
setState(docid);
return values.objectVal(localId);
}
//...
}
{code}
> Easier way to access ValueSource given docid
> --------------------------------------------
>
> Key: LUCENE-4541
> URL: https://issues.apache.org/jira/browse/LUCENE-4541
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/other
> Reporter: David Smiley
> Priority: Minor
>
> I was working on improving some sample code and I needed to access a value
> via a ValueSource given a docid in search results. I was disappointed to see
> how many steps were needed. Incidentally, Solr had to solve the same
> problem, and it's got ValueSourceAugmenter for this. I propose a small
> utility class be created to do something similar, such that the client can
> merely create an instance and then call a method with a doc id to retrieve
> the value.
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