org.apache.lucene.search

Class MultiSearcher

public class MultiSearcher extends Searcher

Implements search over a set of Searchables.

Applications usually need only call the inherited MultiSearcher or MultiSearcher methods.

Constructor Summary
	MultiSearcher(Searchable[] searchables) Creates a searcher which searches searchables.

Method Summary
void	close()
protected Weight	createWeight(Query original) Create weight in multiple index scenario.
Document	doc(int n)
int	docFreq(Term term)
Explanation	explain(Weight weight, int doc)
Searchable[]	getSearchables() Return the array of Searchables this searches.
protected int[]	getStarts()
int	maxDoc()
Query	rewrite(Query original)
TopDocs	search(Weight weight, Filter filter, int nDocs)
TopFieldDocs	search(Weight weight, Filter filter, int n, Sort sort)
void	search(Weight weight, Filter filter, HitCollector results)
int	searcherIndex(int n) Call MultiSearcher instead.
int	subDoc(int n) Returns the document number of document `n` within its sub-index.
int	subSearcher(int n) Returns index of the searcher for document `n` in the array used to construct this searcher.

Constructor Detail

MultiSearcher

public MultiSearcher(Searchable[] searchables)

Creates a searcher which searches searchables.

Method Detail

createWeight

protected Weight createWeight(Query original)

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

Returns: rewritten queries