public class TermAllGroupsCollector extends AbstractAllGroupsCollector<BytesRef>
Implementation detail: an int hash set (SentinelIntSet) is used to detect if a group is already added to the total count. For each segment the int set is cleared and filled with previous counted groups that occur in the new segment.
Modifier and Type | Field and Description |
---|---|
private static int |
DEFAULT_INITIAL_SIZE |
private java.lang.String |
groupField |
private java.util.List<BytesRef> |
groups |
private SortedDocValues |
index |
private SentinelIntSet |
ordSet |
Constructor and Description |
---|
TermAllGroupsCollector(java.lang.String groupField)
Constructs a
AbstractAllGroupsCollector . |
TermAllGroupsCollector(java.lang.String groupField,
int initialSize)
Expert: Constructs a
AbstractAllGroupsCollector |
Modifier and Type | Method and Description |
---|---|
void |
collect(int doc)
Called once for every document matching a query, with the unbased document
number.
|
protected void |
doSetNextReader(LeafReaderContext context)
This method is called before collecting
context . |
java.util.Collection<BytesRef> |
getGroups()
Returns the group values
|
getGroupCount, needsScores, setScorer
getLeafCollector
private static final int DEFAULT_INITIAL_SIZE
private final java.lang.String groupField
private final SentinelIntSet ordSet
private final java.util.List<BytesRef> groups
private SortedDocValues index
public TermAllGroupsCollector(java.lang.String groupField, int initialSize)
AbstractAllGroupsCollector
groupField
- The field to group byinitialSize
- The initial allocation size of the
internal int set and group list
which should roughly match the total
number of expected unique groups. Be aware that the
heap usage is 4 bytes * initialSize.public TermAllGroupsCollector(java.lang.String groupField)
AbstractAllGroupsCollector
. This sets the
initial allocation size for the internal int set and group
list to 128.groupField
- The field to group bypublic void collect(int doc) throws java.io.IOException
LeafCollector
Note: The collection of the current segment can be terminated by throwing
a CollectionTerminatedException
. In this case, the last docs of the
current LeafReaderContext
will be skipped and IndexSearcher
will swallow the exception and continue collection with the next leaf.
Note: This is called in an inner search loop. For good search performance,
implementations of this method should not call IndexSearcher.doc(int)
or
IndexReader.document(int)
on every hit.
Doing so can slow searches by an order of magnitude or more.
collect
in interface LeafCollector
collect
in class SimpleCollector
java.io.IOException
public java.util.Collection<BytesRef> getGroups()
AbstractAllGroupsCollector
This is an unordered collections of group values. For each group that matched the query there is a BytesRef
representing a group value.
getGroups
in class AbstractAllGroupsCollector<BytesRef>
protected void doSetNextReader(LeafReaderContext context) throws java.io.IOException
SimpleCollector
context
.doSetNextReader
in class SimpleCollector
java.io.IOException