gate.creole.annic.apache.lucene.search

Interface Searchable

All Superinterfaces:

Remote

All Known Implementing Classes:

IndexSearcher, LuceneIndexSearcher, Searcher

public interface Searchable
extends Remote

The interface for search implementations.

Implementations provide search over a single index, over multiple indices, and over indices on remote servers.

Method Summary

Modifier and Type	Method and Description
void	close() Frees resources associated with this Searcher.
Document	doc(int i) Expert: Returns the stored fields of document i.
int	docFreq(Term term) Expert: Returns the number of documents containing term.
Explanation	explain(Query query, int doc) Returns an Explanation that describes how doc scored against query.
int	maxDoc() Expert: Returns one greater than the largest possible document number.
Query	rewrite(Query query) Expert: called to re-write queries into primitive queries.
void	search(Query query, Filter filter, HitCollector results) Lower-level search API.
TopDocs	search(Query query, Filter filter, int n) Expert: Low-level search implementation.
TopFieldDocs	search(Query query, Filter filter, int n, Sort sort) Expert: Low-level search implementation with arbitrary sorting.

Method Detail

search

void search(Query query,
            Filter filter,
            HitCollector results)
     throws IOException

Lower-level search API.

HitCollector.collect(int,float) is called for every non-zero scoring document.

Applications should only use this if they need all of the matching documents. The high-level search API (Searcher.search(Query)) is usually more efficient, as it skips non-high-scoring hits.

Parameters:

query - to match documents

filter - if non-null, a bitset used to eliminate some documents

results - to receive hits

Throws:

IOException

close

void close()
    throws IOException

Frees resources associated with this Searcher. Be careful not to call this method while you are still using objects like Hits.

Throws:

IOException

docFreq

int docFreq(Term term)
     throws IOException

Expert: Returns the number of documents containing term. Called by search code to compute term weights. IndexReader.docFreq(Term)

Throws:

IOException

maxDoc

int maxDoc()
    throws IOException

Expert: Returns one greater than the largest possible document number. Called by search code to compute term weights. IndexReader.maxDoc().

Throws:

IOException

search

TopDocs search(Query query,
               Filter filter,
               int n)
        throws IOException

Expert: Low-level search implementation. Finds the top n hits for query, applying filter if non-null.

Called by Hits.

Applications should usually call Searcher.search(Query) or Searcher.search(Query,Filter) instead.

Throws:

IOException

doc

Document doc(int i)
      throws IOException

Expert: Returns the stored fields of document i. Called by HitCollector implementations. IndexReader.document(int).

Throws:

IOException

rewrite

Query rewrite(Query query)
       throws IOException

Expert: called to re-write queries into primitive queries.

Throws:

IOException

explain

Explanation explain(Query query,
                    int doc)
             throws IOException

Returns an Explanation that describes how doc scored against query.

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.

Throws:

IOException

search

TopFieldDocs search(Query query,
                    Filter filter,
                    int n,
                    Sort sort)
             throws 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 Searcher.search(Query,Filter,Sort) instead.

Throws:

IOException