QueryContext (RDF4J 2.5.4 API)

```
public class QueryContext
extends Object
```
A QueryContext provides a means to pass arbitrary local state to a Function or TupleFunction. The implementation of org.eclipse.rdf4j.sail.SailConnection.evaluate() is responsible for initialising a QueryContext and making it available during evaluation via QueryContextIteration. A QueryContext is commonly used to provide a QueryPreparer for the current SailConnection. This allows, for example, Functions to be written that conveniently express more complex queries.

Constructors
Constructor and Description
`QueryContext()`
`QueryContext(QueryPreparer qp)`

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`begin()`
`void`	`end()`
`<T> T`	`getAttribute(String name)`
`static QueryContext`	`getQueryContext()`
`QueryPreparer`	`getQueryPreparer()`
`void`	`setAttribute(String name, Object value)`

public static QueryContext getQueryContext()

public QueryPreparer getQueryPreparer()

public void setAttribute(String name,
                         Object value)

public <T> T getAttribute(String name)

Class QueryContext