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java.lang.Object org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState
public abstract class SortedSetDocValuesReaderState
Wraps a IndexReader
and resolves ords
using existing SortedSetDocValues
APIs without a
separate taxonomy index. This only supports flat facets
(dimension + label), and it makes faceting a bit
slower, adds some cost at reopen time, but avoids
managing the separate taxonomy index. It also requires
less RAM than the taxonomy index, as it manages the flat
(2-level) hierarchy more efficiently. In addition, the
tie-break during faceting is now meaningful (in label
sorted order).
NOTE: creating an instance of this class is
somewhat costly, as it computes per-segment ordinal maps,
so you should create it once and re-use that one instance
for a given IndexReader
.
Nested Class Summary | |
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static class |
SortedSetDocValuesReaderState.OrdRange
Holds start/end range of ords, which maps to one dimension (someday we may generalize it to map to hierarchies within one dimension). |
Constructor Summary | |
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protected |
SortedSetDocValuesReaderState()
Sole constructor. |
Method Summary | |
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abstract SortedSetDocValues |
getDocValues()
Return top-level doc values. |
abstract String |
getField()
Indexed field we are reading. |
abstract SortedSetDocValuesReaderState.OrdRange |
getOrdRange(String dim)
Returns the SortedSetDocValuesReaderState.OrdRange for this dimension. |
abstract IndexReader |
getOrigReader()
Returns top-level index reader. |
abstract Map<String,SortedSetDocValuesReaderState.OrdRange> |
getPrefixToOrdRange()
Returns mapping from prefix to SortedSetDocValuesReaderState.OrdRange . |
abstract int |
getSize()
Number of unique labels. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected SortedSetDocValuesReaderState()
Method Detail |
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public abstract SortedSetDocValues getDocValues() throws IOException
IOException
public abstract String getField()
public abstract SortedSetDocValuesReaderState.OrdRange getOrdRange(String dim)
SortedSetDocValuesReaderState.OrdRange
for this dimension.
public abstract Map<String,SortedSetDocValuesReaderState.OrdRange> getPrefixToOrdRange()
SortedSetDocValuesReaderState.OrdRange
.
public abstract IndexReader getOrigReader()
public abstract int getSize()
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