Class QueryEvaluator

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 ConsoleCommand

LOGGER

Modifier and Type	Field	Description
protected final org.slf4j.Logger	LOGGER

Constructor Summary

Constructors

Constructor	Description
QueryEvaluator(TupleAndGraphQueryEvaluator evaluator)	Constructor

Method Summary

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 ConsoleCommand

askProceed, execute, getConsoleIO, getConsoleSettings, getConsoleState, getHelpLong, getHelpShort, write, writeError, writeError, writeInfo, writeln, writeUnopenedError

Modifier and Type	Method	Description
protected boolean	askProceed(String str, boolean defVal)	Ask user to proceed
void	execute(String... parameters)	Execute the given parameters.
ConsoleIO	getConsoleIO()	Get console IO
Map<String, ConsoleSetting>	getConsoleSettings()	Get console settings map
ConsoleState	getConsoleState()	Get console state
String	getHelpLong()	Get long description
String	getHelpShort()	Get short description, small enough to fit on one console row
protected void	write(String str)	Write a string to the console
protected void	writeError(String str)	Write a string + newline to the console and to the log as an error
protected void	writeError(String str, Exception e)	Write a string + message of exception + newline to the console and to the log as an error
protected void	writeInfo(String str)	Write a string + newline to the console and to the log at level INFO
protected void	writeln(String str)	Write a string + newline to the console
protected void	writeUnopenedError()	Write repository not opened error

Methods inherited from class Object

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

Methods inherited from interface Help

getName

Modifier and Type	Method	Description
String	getName()	Get the name of the command

Constructor Details

QueryEvaluator

public QueryEvaluator(TupleAndGraphQueryEvaluator evaluator)

Constructor

Parameters:

evaluator -

Method Details

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