DatasetImpl (Apache Jena ARQ)

java.lang.Object
- com.hp.hpl.jena.sparql.core.DatasetImpl

All Implemented Interfaces:

Dataset
```
public class DatasetImpl
extends Object
implements Dataset
```
A implementation of a Dataset. This is the "usual" implementation based on wrapping a DatasetGraph and providing an adapter layer from Model/Resource to Graph/Node The characteristics of this adapter depend on the characteristics of DatasetGraph.

Constructor Summary

Constructors
Constructor and Description

DatasetImpl(Dataset ds)

DatasetImpl(Model model)
Create a Dataset with the model as default model.

Constructors
Constructor and Description
`DatasetImpl(Dataset ds)`
`DatasetImpl(Model model)` Create a Dataset with the model as default model.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`abort()` Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
`void`	`addNamedModel(String uri, Model model)` Set a named graph.
`DatasetGraph`	`asDatasetGraph()` Get the dataset in graph form
`void`	`begin(ReadWrite mode)` Start either a READ or WRITE transaction
`static Dataset`	`cloneStructure(DatasetGraph datasetGraph)` Clone the structure of a DatasetGraph.
`void`	`close()` Close the dataset, potentially releasing any associated resources.
`void`	`commit()` Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
`boolean`	`containsNamedModel(String uri)` Does the dataset contain a model with the name supplied?
`void`	`end()` Finish the transaction - if a write transaction and commit() has not been called, then abort
`Context`	`getContext()` Get the context associated with this dataset
`Model`	`getDefaultModel()` Get the default graph as a Jena Model
`Lock`	`getLock()` Get the lock for this dataset
`Model`	`getNamedModel(String uri)` Get a graph by name as a Jena Model
`boolean`	`isInTransaction()` Say whether a transaction is active
`Iterator<String>`	`listNames()` List the names
`void`	`removeNamedModel(String uri)` Remove a named graph.
`void`	`replaceNamedModel(String uri, Model model)` Change a named graph for another using the same name
`void`	`setDefaultModel(Model model)` Set the background graph.
`boolean`	`supportsTransactions()` Does this dataset support transactions? Supporting transactions mean that the dataset implementation provides `Dataset.begin(com.hp.hpl.jena.query.ReadWrite)`, `Dataset.commit()`, `Dataset.abort()`, `Dataset.end()` which otherwise may throw `UnsupportedOperationException`
`static Dataset`	`wrap(DatasetGraph datasetGraph)` Wrap an existing DatasetGraph

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

- Constructor Detail
  - DatasetImpl
```
public DatasetImpl(Model model)
```
    Create a Dataset with the model as default model. Named models must be explicitly added to identify the storage to be used.
  - DatasetImpl
```
public DatasetImpl(Dataset ds)
```
- Method Detail
  - wrap
```
public static Dataset wrap(DatasetGraph datasetGraph)
```
    Wrap an existing DatasetGraph
  - cloneStructure
```
public static Dataset cloneStructure(DatasetGraph datasetGraph)
```
    Clone the structure of a DatasetGraph. The current graph themselves are shared but new naming and new graphs are only in the cloned
  - getDefaultModel
```
public Model getDefaultModel()
```
    Description copied from interface: Dataset
    
    Get the default graph as a Jena Model
    
    Specified by:
    
    getDefaultModel in interface Dataset
  - getLock
```
public Lock getLock()
```
    Description copied from interface: Dataset
    
    Get the lock for this dataset
    
    Specified by:
    
    getLock in interface Dataset
  - getContext
```
public Context getContext()
```
    Description copied from interface: Dataset
    
    Get the context associated with this dataset
    
    Specified by:
    
    getContext in interface Dataset
  - supportsTransactions
```
public boolean supportsTransactions()
```
    Description copied from interface: Dataset
    
    Does this dataset support transactions? Supporting transactions mean that the dataset implementation provides Dataset.begin(com.hp.hpl.jena.query.ReadWrite), Dataset.commit(), Dataset.abort(), Dataset.end() which otherwise may throw UnsupportedOperationException
    
    Specified by:
    
    supportsTransactions in interface Dataset
  - begin
```
public void begin(ReadWrite mode)
```
    Description copied from interface: Dataset
    
    Start either a READ or WRITE transaction
    
    Specified by:
    
    begin in interface Dataset
  - isInTransaction
```
public boolean isInTransaction()
```
    Say whether a transaction is active
    
    Specified by:
    
    isInTransaction in interface Dataset
  - commit
```
public void commit()
```
    Description copied from interface: Dataset
    
    Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
    
    Specified by:
    
    commit in interface Dataset
  - abort
```
public void abort()
```
    Description copied from interface: Dataset
    
    Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
    
    Specified by:
    
    abort in interface Dataset
  - end
```
public void end()
```
    Description copied from interface: Dataset
    
    Finish the transaction - if a write transaction and commit() has not been called, then abort
    
    Specified by:
    
    end in interface Dataset
  - asDatasetGraph
```
public DatasetGraph asDatasetGraph()
```
    Description copied from interface: Dataset
    
    Get the dataset in graph form
    
    Specified by:
    
    asDatasetGraph in interface Dataset
  - getNamedModel
```
public Model getNamedModel(String uri)
```
    Description copied from interface: Dataset
    
    Get a graph by name as a Jena Model
    
    Specified by:
    
    getNamedModel in interface Dataset
  - addNamedModel
```
public void addNamedModel(String uri,
                 Model model)
                   throws LabelExistsException
```
    Description copied from interface: Dataset
    
    Set a named graph.
    
    Specified by:
    
    addNamedModel in interface Dataset
    
    Throws:
    
    LabelExistsException
  - removeNamedModel
```
public void removeNamedModel(String uri)
```
    Description copied from interface: Dataset
    
    Remove a named graph.
    
    Specified by:
    
    removeNamedModel in interface Dataset
  - replaceNamedModel
```
public void replaceNamedModel(String uri,
                     Model model)
```
    Description copied from interface: Dataset
    
    Change a named graph for another using the same name
    
    Specified by:
    
    replaceNamedModel in interface Dataset
  - setDefaultModel
```
public void setDefaultModel(Model model)
```
    Description copied from interface: Dataset
    
    Set the background graph. Can be set to null for none.
    
    Specified by:
    
    setDefaultModel in interface Dataset
  - containsNamedModel
```
public boolean containsNamedModel(String uri)
```
    Description copied from interface: Dataset
    
    Does the dataset contain a model with the name supplied?
    
    Specified by:
    
    containsNamedModel in interface Dataset
  - listNames
```
public Iterator<String> listNames()
```
    Description copied from interface: Dataset
    
    List the names
    
    Specified by:
    
    listNames in interface Dataset
  - close
```
public void close()
```
    Description copied from interface: Dataset
    
    Close the dataset, potentially releasing any associated resources. The dataset can not be used for query after this call.
    
    Specified by:
    
    close in interface Dataset

Class DatasetImpl

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DatasetImpl

DatasetImpl

Method Detail

wrap

cloneStructure

getDefaultModel

getLock

getContext

supportsTransactions

begin

isInTransaction

commit

abort

end

asDatasetGraph

getNamedModel

addNamedModel

removeNamedModel

replaceNamedModel

setDefaultModel

containsNamedModel

listNames

close