java.lang.Object | ||
↳ | org.apache.lucene.search.Searcher | |
↳ | org.apache.lucene.search.MultiSearcher |
Known Direct Subclasses |
Implements search over a set of Searchables
.
Applications usually need only call the inherited search(Query, int)
or search(Query, Filter, int)
methods.
Public Constructors | |||||||||||
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Creates a searcher which searches searchers.
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Public Methods | |||||||||||
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Frees resources associated with this Searcher.
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Returns the stored fields of document
i . | |||||||||||
Get the
Document at the n th position. | |||||||||||
Expert: Returns the number of documents containing
term . | |||||||||||
Expert: low-level implementation method
Returns an Explanation that describes how
doc scored against
weight . | |||||||||||
Return the array of
Searchable s this searches. | |||||||||||
Expert: Returns one greater than the largest possible document number.
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Expert: called to re-write queries into primitive queries.
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Lower-level search API.
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Expert: Low-level search implementation.
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Expert: Low-level search implementation with arbitrary sorting.
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Returns the document number of document
n within its
sub-index. | |||||||||||
Returns index of the searcher for document
n in the array
used to construct this searcher. |
Protected Methods | |||||||||||
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Create weight in multiple index scenario.
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[Expand]
Inherited Methods | |||||||||||
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From class
org.apache.lucene.search.Searcher
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From class
java.lang.Object
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From interface
java.io.Closeable
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From interface
org.apache.lucene.search.Searchable
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Creates a searcher which searches searchers.
IOException |
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Frees resources associated with this Searcher. Be careful not to call this method while you are still using objects that reference this Searchable.
IOException |
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Returns the stored fields of document i
.
CorruptIndexException | |
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IOException |
Get the Document
at the n
th position. The FieldSelector
may be used to determine what Field
s to load and how they should be loaded.
NOTE: If the underlying Reader (more specifically, the underlying FieldsReader
) is closed before the lazy Field
is
loaded an exception may be thrown. If you want the value of a lazy Field
to be available after closing you must
explicitly load it or fetch the Document again with a new loader.
n | Get the document at the n th position |
---|---|
fieldSelector | The FieldSelector to use to determine what Fields should be loaded on the Document. May be null, in which case all Fields will be loaded. |
Document
at the nth positionCorruptIndexException | |
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IOException |
Expert: Returns the number of documents containing term
.
IOException |
---|
Expert: low-level implementation method
Returns an Explanation that describes how doc
scored against
weight
.
This is intended to be used in developing Similarity implementations, and, for good performance, should not be displayed with every hit. Computing an explanation is as expensive as executing the query over the entire index.
Applications should call explain(Query, int)
.
IOException |
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Expert: Returns one greater than the largest possible document number.
IOException |
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Expert: called to re-write queries into primitive queries.
IOException |
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Lower-level search API.
collect(int)
is called for every document.
Collector-based access to remote indexes is discouraged.
Applications should only use this if they need all of the matching
documents. The high-level search API (search(Query, int)
) is
usually more efficient, as it skips non-high-scoring hits.
weight | to match documents |
---|---|
filter | if non-null, used to permit documents to be collected. |
collector | to receive hits |
IOException |
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Expert: Low-level search implementation. Finds the top n
hits for query
, applying filter
if non-null.
Applications should usually call search(Query, int)
or
search(Query, Filter, int)
instead.
IOException |
---|
Expert: Low-level search implementation with arbitrary sorting. Finds
the top n
hits for query
, applying
filter
if non-null, and sorting the hits by the criteria in
sort
.
Applications should usually call search(Query, Filter, int, Sort)
instead.
IOException |
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Returns the document number of document n
within its
sub-index.
Returns index of the searcher for document n
in the array
used to construct this searcher.
Create weight in multiple index scenario. Distributed query processing is done in the following steps: 1. rewrite query 2. extract necessary terms 3. collect dfs for these terms from the Searchables 4. create query weight using aggregate dfs. 5. distribute that weight to Searchables 6. merge results Steps 1-4 are done here, 5+6 in the search() methods
IOException |
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