QueryElementCollection (Eclipse RDF4J 4.2.4)

java.lang.Object
- org.eclipse.rdf4j.sparqlbuilder.core.QueryElementCollection<T>

Type Parameters:

T - the type of QueryElements in the collection

All Implemented Interfaces:

QueryElement

Direct Known Subclasses:

Projection, RdfPredicateObjectListCollection, StandardQueryElementCollection
```
public abstract class QueryElementCollection<T extends QueryElement>
extends Object
implements QueryElement
```
A logical collection of query elements. Provides common functionality for elements which are collections of other elements, especially in printing. Would have loved to have avoided making this public.

Field Summary

Fields
Modifier and Type Field Description

protected Collection<T> elements

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`QueryElementCollection()`
`protected`	`QueryElementCollection(String delimiter)`
`protected`	`QueryElementCollection(String delimiter, Collection<T> elements)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected <O> void`	`addElements(Function<? super O,? extends T> mapper, O... os)`
`protected void`	`addElements(T... queryElements)`
`String`	`getQueryString()`
`boolean`	`isEmpty()`

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

Field Detail

elements

protected Collection<T extends QueryElement> elements

Constructor Detail

QueryElementCollection
```
protected QueryElementCollection()
```

QueryElementCollection

protected QueryElementCollection(String delimiter)

QueryElementCollection

protected QueryElementCollection(String delimiter,
                                 Collection<T> elements)

Method Detail

isEmpty
```
public boolean isEmpty()
```
Returns:

if this collection is empty

addElements

protected void addElements(T... queryElements)

addElements

protected <O> void addElements(Function<? super O,? extends T> mapper,
                               O... os)

getQueryString
```
public String getQueryString()
```
Specified by:

getQueryString in interface QueryElement

Returns:

the String representing the SPARQL syntax of this element