QueryEvaluator (Eclipse RDF4J 4.3.2)

java.lang.Object
- org.eclipse.rdf4j.console.command.ConsoleCommand
- - org.eclipse.rdf4j.console.command.QueryEvaluator

All Implemented Interfaces:

Command, Help

Direct Known Subclasses:

Sparql
```
public abstract class QueryEvaluator
extends ConsoleCommand
```
Abstract query evaluator command

Author:

Dale Visser, Bart Hanssens

Field Summary
- Fields inherited from class org.eclipse.rdf4j.console.command.ConsoleCommand
  LOGGER

Constructor Summary

Constructors
Constructor Description

QueryEvaluator(TupleAndGraphQueryEvaluator evaluator)
Constructor

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract void`	`addQueryPrefixes(StringBuffer result, Collection<Namespace> namespaces)`	Add namespace prefixes to query
`void`	`executeQuery(String command, String operation)`	Execute a SPARQL query
`protected abstract boolean`	`hasQueryPrefixes(String query)`	Check if query string already contains query prefixes
`String[]`	`usesSettings()`	Return the names of the settings used.

Methods inherited from class org.eclipse.rdf4j.console.command.ConsoleCommand
askProceed, execute, getConsoleIO, getConsoleSettings, getConsoleState, getHelpLong, getHelpShort, write, writeError, writeError, writeInfo, writeln, writeUnopenedError

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eclipse.rdf4j.console.Help
getName

- Constructor Detail
  - QueryEvaluator
```
public QueryEvaluator(TupleAndGraphQueryEvaluator evaluator)
```
    Constructor
    
    Parameters:
    
    evaluator -
- Method Detail
  - hasQueryPrefixes
```
protected abstract boolean hasQueryPrefixes(String query)
```
    Check if query string already contains query prefixes
    
    Parameters:
    
    query - query string
    
    Returns:
    
    true if namespaces are already used
  - addQueryPrefixes
```
protected abstract void addQueryPrefixes(StringBuffer result,
                                         Collection<Namespace> namespaces)
```
    Add namespace prefixes to query
    
    Parameters:
    
    result -
    
    namespaces - collection of known namespaces
  - usesSettings
```
public String[] usesSettings()
```
    Description copied from interface: Command
    
    Return the names of the settings used.
    
    Specified by:
    
    usesSettings in interface Command
    
    Overrides:
    
    usesSettings in class ConsoleCommand
    
    Returns:
    
    string array of settings
  - executeQuery
```
public void executeQuery(String command,
                         String operation)
```
    Execute a SPARQL query
    
    Parameters:
    
    command - to execute
    
    operation - "sparql", "base" or SPARQL query form