it.unimi.di.big.mg4j.query

Class Query

java.lang.Object

it.unimi.di.big.mg4j.query.Query

public class Query
extends Object

A command-line interpreter to query indices.

This class can be used to start a query engine from the command line. Optionally, it can start a web server that will serve the results in a search-engine-like environment. Changes to the query engine made on the command line will reflect on subsequent queries (also on the web server). The web server access is fully multithreaded.

This class does not provide command-line history or editing: to get that effect, we suggest to rely on some operating-system utility such as rlwrap.

Warning: This class is highly experimental (it is the place that we tweak to experiment every kind of new indexing/ranking method).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Query.Command
static class	Query.OutputType

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_STEMMING

Constructor Summary

Constructors

Constructor and Description
Query(QueryEngine queryEngine)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	interpretCommand(String line) Interpret the given command, changing the static variables.
static void	main(String[] arg)
int	output(ObjectArrayList<DocumentScoreInfo<Reference2ObjectMap<Index,SelectedInterval[]>>> results, DocumentCollection documentCollection, BigList<? extends CharSequence> titleList, Marker marker) Scores the given document iterator and produces score output.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_STEMMING

public static final int MAX_STEMMING

See Also:

Constant Field Values

Constructor Detail

Query

public Query(QueryEngine queryEngine)

Method Detail

interpretCommand

public boolean interpretCommand(String line)

Interpret the given command, changing the static variables. See the help printing code for possible commands.

Parameters:

line - the command line.

Returns:

false iff we should exit after this command.

output

public int output(ObjectArrayList<DocumentScoreInfo<Reference2ObjectMap<Index,SelectedInterval[]>>> results,
         DocumentCollection documentCollection,
         BigList<? extends CharSequence> titleList,
         Marker marker)
           throws IOException

Scores the given document iterator and produces score output.

Parameters:

results - an iterator returning instances of DocumentScoreInfo.

documentCollection - an optional document collection, or null.

titleList - an optional list of titles, or null.

marker - an optional text marker to mark snippets, or null.

Returns:

the number of documents scanned.

Throws:

IOException

main

public static void main(String[] arg)
                 throws Exception

Throws:

Exception