```
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.

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

public QueryContext(QueryPreparer qp)

public static QueryContext getQueryContext()

public QueryPreparer getQueryPreparer()

public void setAttribute(String name,
                         Object value)

public <T> T getAttribute(String name)

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

Class QueryContext