public class TermAutomatonQuery extends Query
PhraseQuery, MultiPhraseQuery and SpanNearQuery. It is likely
slow, since it visits any document having any of the terms (i.e. it
acts like a disjunction, not a conjunction like PhraseQuery), and then it must merge-sort all positions within each
document to test whether/how many times the automaton matches.
After creating the query, use createState(), setAccept(int, boolean), addTransition(int, int, java.lang.String) and addAnyTransition(int, int) to
build up the automaton. Once you are done, call finish() and
then execute the query.
This code is very new and likely has exciting bugs!
| Constructor and Description |
|---|
TermAutomatonQuery(String field) |
| Modifier and Type | Method and Description |
|---|---|
void |
addAnyTransition(int source,
int dest)
Adds a transition matching any term.
|
void |
addTransition(int source,
int dest,
BytesRef term)
Adds a transition to the automaton.
|
void |
addTransition(int source,
int dest,
String term)
Adds a transition to the automaton.
|
int |
createState()
Returns a new state; state 0 is always the initial state.
|
Weight |
createWeight(IndexSearcher searcher,
boolean needsScores)
Expert: Constructs an appropriate Weight implementation for this query.
|
boolean |
equals(Object other)
Returns true iff
o is equal to this. |
void |
finish()
Call this once you are done adding states/transitions.
|
void |
finish(int maxDeterminizedStates)
Call this once you are done adding states/transitions.
|
int |
hashCode()
Override and implement query hash code properly in a subclass.
|
Query |
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.
|
void |
setAccept(int state,
boolean accept)
Marks the specified state as accept or not.
|
String |
toDot()
Returns the dot (graphviz) representation of this automaton.
|
String |
toString(String field)
Prints a query to a string, with
field assumed to be the
default field and omitted. |
classHash, sameClassAs, toStringpublic TermAutomatonQuery(String field)
public int createState()
public void setAccept(int state, boolean accept)
public void addTransition(int source, int dest, String term)
public void addTransition(int source, int dest, BytesRef term)
public void addAnyTransition(int source, int dest)
public void finish()
public void finish(int maxDeterminizedStates)
maxDeterminizedStates - Maximum number of states created when
determinizing the automaton. Higher numbers allow this operation to
consume more memory but allow more complex automatons.public Weight createWeight(IndexSearcher searcher, boolean needsScores) throws IOException
QueryOnly implemented by primitive queries, which re-write to themselves.
createWeight in class QueryneedsScores - True if document scores (Scorer.score()) or match
frequencies (Scorer.freq()) are needed.IOExceptionpublic String toString(String field)
Queryfield assumed to be the
default field and omitted.public boolean equals(Object other)
o is equal to this.equals in class QueryQuery.sameClassAs(Object),
Query.classHash()public int hashCode()
QueryQueryCache works properly.hashCode in class QueryQuery.equals(Object)public String toDot()
public Query rewrite(IndexReader reader) throws IOException
Queryrewrite in class QueryIOException