Selector (Apache Jena)

All Superinterfaces:

java.util.function.Predicate<Statement>

All Known Implementing Classes:

SelectorImpl, SimpleSelector
```
public interface Selector
extends java.util.function.Predicate<Statement>
```
A Statement selector.
Model includes list and query methods which will return all the statements which are selected by a selector object. This is the interface of such selector objects.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`RDFNode`	`getObject()`	Answer the only RDFNode object that this Selector will match, or null if it can match more than a single node.
`Property`	`getPredicate()`	Answer the only predicate Property that this Selector will match, or null if it can match more than a single property.
`Resource`	`getSubject()`	Answer the only subject Resource that this Selector will match, or null if it can match more that a single resource.
`boolean`	`isSimple()`	Answer true iff this Selector is completely characterised by its subject, predicate, and object fields.

Methods inherited from interface java.util.function.Predicate
and, negate, or, test

- Method Detail
  - isSimple
```
boolean isSimple()
```
    Answer true iff this Selector is completely characterised by its subject, predicate, and object fields. If so, the test predicate need not be called to decide if a statement is acceptable. This allows query engines latitude for optimisation (and our memory-based implementation both exploits this licence).
  - getSubject
```
Resource getSubject()
```
    Answer the only subject Resource that this Selector will match, or null if it can match more that a single resource.
  - getPredicate
```
Property getPredicate()
```
    Answer the only predicate Property that this Selector will match, or null if it can match more than a single property.
  - getObject
```
RDFNode getObject()
```
    Answer the only RDFNode object that this Selector will match, or null if it can match more than a single node.