GraphUnionRead (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.graph.impl.GraphBase
- - org.apache.jena.sparql.graph.GraphUnionRead

All Implemented Interfaces:

Graph, GraphWithPerform
```
public class GraphUnionRead
extends GraphBase
```
Immutable graph that is the view of a union of graphs in a dataset. This union can be a fixed set of graph or all named graph. This union iterates over graphs.
GraphView provides a view over a dataset and does support union graph but assumes quad access is efficient and does not end up looping.

See Also:

GraphView, DatasetGraphMap

Field Summary
- Fields inherited from class org.apache.jena.graph.impl.GraphBase
  TOSTRING_TRIPLE_BASE, TOSTRING_TRIPLE_LIMIT
- Fields inherited from interface org.apache.jena.graph.Graph
  emptyGraph

Constructor Summary

Constructors
Constructor	Description
`GraphUnionRead(DatasetGraph dsg)`	Read-only graph view of all named graphs in the dataset.
`GraphUnionRead(DatasetGraph dsg, java.util.Collection<Node> graphs)`	Read-only graph view of a set of graphs from the dataset

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`TransactionHandler`	`getTransactionHandler()`
`void`	`performAdd(Triple t)`
`void`	`performDelete(Triple t)`

Methods inherited from class org.apache.jena.graph.impl.GraphBase
add, clear, close, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getCapabilities, getEventManager, getPrefixMapping, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, remove, size, toString, toString

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

Methods inherited from interface org.apache.jena.graph.Graph
add, delete, find, stream, stream

- Constructor Detail
  - GraphUnionRead
```
public GraphUnionRead(DatasetGraph dsg)
```
    Read-only graph view of all named graphs in the dataset. If graphs are added after this view if created, then this is reflected in the find call.
  - GraphUnionRead
```
public GraphUnionRead(DatasetGraph dsg,
                      java.util.Collection<Node> graphs)
```
    Read-only graph view of a set of graphs from the dataset
- Method Detail
  - getTransactionHandler
```
public TransactionHandler getTransactionHandler()
```
    Specified by:
    
    getTransactionHandler in interface Graph
    
    Overrides:
    
    getTransactionHandler in class GraphBase
  - performAdd
```
public void performAdd(Triple t)
```
    Specified by:
    
    performAdd in interface GraphWithPerform
    
    Overrides:
    
    performAdd in class GraphBase
  - performDelete
```
public void performDelete(Triple t)
```
    Specified by:
    
    performDelete in interface GraphWithPerform
    
    Overrides:
    
    performDelete in class GraphBase