DatasetGraphInMemory (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.sparql.core.DatasetGraphBase
- - org.apache.jena.sparql.core.DatasetGraphBaseFind
  - - org.apache.jena.sparql.core.DatasetGraphTriplesQuads
    - - org.apache.jena.sparql.core.mem.DatasetGraphInMemory

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, DatasetGraph, Transactional
```
public class DatasetGraphInMemory
extends DatasetGraphTriplesQuads
implements Transactional
```
A DatasetGraph backed by an QuadTable. By default, this is a HexTable designed for high-speed in-memory operation.

Constructor Summary

Constructors
Constructor and Description

DatasetGraphInMemory()
Default constructor.

DatasetGraphInMemory(QuadTable i, TripleTable t)

Constructors
Constructor and Description
`DatasetGraphInMemory()` Default constructor.
`DatasetGraphInMemory(QuadTable i, TripleTable t)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`abort()` Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
`void`	`addGraph(Node graphName, Graph graph)` Add the given graph to the dataset.
`void`	`begin(ReadWrite readWrite)` Start either a READ or WRITE transaction
`void`	`clear()` Remove everything - remove all named graphs, clear the default graph
`void`	`close()` Close the dataset
`void`	`commit()` Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
`void`	`end()` Finish the transaction - if a write transaction and commit() has not been called, then abort
`Graph`	`getDefaultGraph()` Get the default graph as a Jena Graph
`Graph`	`getGraph(Node graphNode)` Get the graph named by graphNode : returns null on no graph NB Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation.
`boolean`	`isInTransaction()` Say whether inside a transaction.
`Iterator<Node>`	`listGraphNodes()` Iterate over all names of named graphs
`DatasetPrefixStorage`	`prefixes()`
`void`	`removeGraph(Node graphName)` Remove all data associated with the named graph
`void`	`setDefaultGraph(Graph g)` Set the default graph.
`long`	`size()` Get the size (number of named graphs) - may be -1 for unknown
`boolean`	`supportsTransactionAbort()` Declare whether `Transactional.abort()` is supported.
`boolean`	`supportsTransactions()` A `DatasetGraph` supports tranactions if it provides `Transactional.begin(org.apache.jena.query.ReadWrite)`/ `Transactional.commit()`/`Transactional.end()`.
`ReadWrite`	`transactionType()`

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphTriplesQuads
add, add, delete, delete

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBaseFind
find, findInUnionGraph, findNG, findQuadsInUnionGraph

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBase
contains, contains, containsGraph, deleteAny, find, find, getContext, getLock, isEmpty, toString

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

- Constructor Detail
  - DatasetGraphInMemory
```
public DatasetGraphInMemory()
```
    Default constructor.
  - DatasetGraphInMemory
```
public DatasetGraphInMemory(QuadTable i,
                            TripleTable t)
```
    Parameters:
    
    i - a table in which to store quads
    
    t - a table in which to store triples
- Method Detail
  - isInTransaction
```
public boolean isInTransaction()
```
    Description copied from interface: Transactional
    
    Say whether inside a transaction.
    
    Specified by:
    
    isInTransaction in interface Transactional
  - transactionType
```
public ReadWrite transactionType()
```
    Returns:
    
    the type of transaction in progress
  - supportsTransactions
```
public boolean supportsTransactions()
```
    Description copied from interface: DatasetGraph
    
    A DatasetGraph supports tranactions if it provides Transactional.begin(org.apache.jena.query.ReadWrite)/ Transactional.commit()/Transactional.end(). There core storage DatasetGraph that provide fully serialized transactions. DatasetGraph that provide functionality acorss independent systems can not provide such strong guarantees. For example, they may use MRSW locking and some isolation control. Specifically, they do not necessarily provide Transactional.abort().
    See DatasetGraph.supportsTransactionAbort() for Transactional.abort(). In addition, check details of a specific implementation.
    
    Specified by:
    
    supportsTransactions in interface DatasetGraph
  - supportsTransactionAbort
```
public boolean supportsTransactionAbort()
```
    Description copied from interface: DatasetGraph
    
    Declare whether Transactional.abort() is supported. This goes along with clearing up after exceptions inside application transaction code.
    
    Specified by:
    
    supportsTransactionAbort in interface DatasetGraph
  - begin
```
public void begin(ReadWrite readWrite)
```
    Description copied from interface: Transactional
    
    Start either a READ or WRITE transaction
    
    Specified by:
    
    begin in interface Transactional
  - commit
```
public void commit()
```
    Description copied from interface: Transactional
    
    Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
    
    Specified by:
    
    commit in interface Transactional
  - abort
```
public void abort()
```
    Description copied from interface: Transactional
    
    Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
    
    Specified by:
    
    abort in interface Transactional
  - close
```
public void close()
```
    Description copied from interface: DatasetGraph
    
    Close the dataset
    
    Specified by:
    
    close in interface org.apache.jena.atlas.lib.Closeable
    
    Specified by:
    
    close in interface DatasetGraph
    
    Overrides:
    
    close in class DatasetGraphBase
  - end
```
public void end()
```
    Description copied from interface: Transactional
    
    Finish the transaction - if a write transaction and commit() has not been called, then abort
    
    Specified by:
    
    end in interface Transactional
  - listGraphNodes
```
public Iterator<Node> listGraphNodes()
```
    Description copied from interface: DatasetGraph
    
    Iterate over all names of named graphs
    
    Specified by:
    
    listGraphNodes in interface DatasetGraph
  - setDefaultGraph
```
public void setDefaultGraph(Graph g)
```
    Description copied from interface: DatasetGraph
    
    Set the default graph. Set the active graph if it was null. This replaces the contents default graph, not merge data into it. Do not assume that the same object is returned by DatasetGraph.getDefaultGraph()
    
    Specified by:
    
    setDefaultGraph in interface DatasetGraph
    
    Overrides:
    
    setDefaultGraph in class DatasetGraphTriplesQuads
  - getGraph
```
public Graph getGraph(Node graphNode)
```
    Description copied from interface: DatasetGraph
    
    Get the graph named by graphNode : returns null on no graph NB Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation. Some datasets are "open" - they have all graphs even if no triples,
    
    Specified by:
    
    getGraph in interface DatasetGraph
    
    Specified by:
    
    getGraph in class DatasetGraphBase
  - getDefaultGraph
```
public Graph getDefaultGraph()
```
    Description copied from interface: DatasetGraph
    
    Get the default graph as a Jena Graph
    
    Specified by:
    
    getDefaultGraph in interface DatasetGraph
    
    Specified by:
    
    getDefaultGraph in class DatasetGraphBase
  - addGraph
```
public void addGraph(Node graphName,
                     Graph graph)
```
    Description copied from interface: DatasetGraph
    
    Add the given graph to the dataset. Replaces any existing data for the named graph; to add data, get the graph and add triples to it, or add quads to the dataset. Do not assume that the same Java object is returned by DatasetGraph.getGraph(org.apache.jena.graph.Node)
    
    Specified by:
    
    addGraph in interface DatasetGraph
    
    Overrides:
    
    addGraph in class DatasetGraphTriplesQuads
  - removeGraph
```
public void removeGraph(Node graphName)
```
    Description copied from interface: DatasetGraph
    
    Remove all data associated with the named graph
    
    Specified by:
    
    removeGraph in interface DatasetGraph
    
    Overrides:
    
    removeGraph in class DatasetGraphTriplesQuads
  - prefixes
```
public DatasetPrefixStorage prefixes()
```
    Returns:
    
    the prefixes in use in this dataset
  - size
```
public long size()
```
    Description copied from interface: DatasetGraph
    
    Get the size (number of named graphs) - may be -1 for unknown
    
    Specified by:
    
    size in interface DatasetGraph
    
    Overrides:
    
    size in class DatasetGraphBase
  - clear
```
public void clear()
```
    Description copied from interface: DatasetGraph
    
    Remove everything - remove all named graphs, clear the default graph
    
    Specified by:
    
    clear in interface DatasetGraph
    
    Overrides:
    
    clear in class DatasetGraphBase

Class DatasetGraphInMemory

Constructor Summary

Method Summary

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphTriplesQuads

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBaseFind

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBase

Methods inherited from class java.lang.Object

Constructor Detail

DatasetGraphInMemory

DatasetGraphInMemory

Method Detail

isInTransaction

transactionType

supportsTransactions

supportsTransactionAbort

begin

commit

abort

close

end

listGraphNodes

setDefaultGraph

getGraph

getDefaultGraph

addGraph

removeGraph

prefixes

size

clear