Query (MG4J (big) 5.4.4)

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 Description

static class Query.Command

static class Query.OutputType

Field Summary

Fields
Modifier and Type Field Description

static int MAX_STEMMING

Constructor Summary

Constructors
Constructor Description

Query(QueryEngine queryEngine)

Method Summary

Modifier and Type	Method	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