How to use

getDataset

method

in

co.cask.cdap.data.dataset.SystemDatasetInstantiator

public <T extends Dataset> T getDataset(DatasetId datasetId, Map<String, String> arguments)
 throws DatasetInstantiationException {
 return getDataset(datasetId, arguments, AccessType.UNKNOWN);
}

public <T extends Dataset> T getDataset(DatasetId datasetId, Map<String, String> arguments)
 throws DatasetInstantiationException {
 return getDataset(datasetId, arguments, AccessType.UNKNOWN);
}

public <T extends Dataset> T getDataset(DatasetId datasetId)
 throws DatasetInstantiationException {
 return getDataset(datasetId, DatasetDefinition.NO_ARGUMENTS);
}

public <T extends Dataset> T getDataset(DatasetId datasetId)
 throws DatasetInstantiationException {
 return getDataset(datasetId, DatasetDefinition.NO_ARGUMENTS);
}

public void initialize() throws IOException, DatasetManagementException,
 DatasetNotFoundException, ClassNotFoundException {
 dataset = datasetInstantiator.getDataset(datasetId);
 if (dataset instanceof TransactionAware) {
  ((TransactionAware) dataset).startTx(transaction);
 }
}

public void initialize() throws IOException, DatasetManagementException,
 DatasetNotFoundException, ClassNotFoundException {
 dataset = datasetInstantiator.getDataset(datasetId);
 if (dataset instanceof TransactionAware) {
  ((TransactionAware) dataset).startTx(transaction);
 }
}

private String generateEnableStatement(DatasetId datasetId, DatasetSpecification spec, boolean truncating)
 throws UnsupportedTypeException, ExploreException {
 try (SystemDatasetInstantiator datasetInstantiator = datasetInstantiatorFactory.create()) {
  Dataset dataset = datasetInstantiator.getDataset(datasetId);
  try {
   return generateEnableStatement(dataset, spec, datasetId,
                   tableNaming.getTableName(datasetId, spec.getProperties()), truncating);
  } finally {
   Closeables.closeQuietly(dataset);
  }
 } catch (IOException e) {
  throw new ExploreException("Exception while trying to instantiate dataset " + datasetId, e);
 }
}

private String generateEnableStatement(DatasetId datasetId, DatasetSpecification spec, boolean truncating)
 throws UnsupportedTypeException, ExploreException {
 try (SystemDatasetInstantiator datasetInstantiator = datasetInstantiatorFactory.create()) {
  Dataset dataset = datasetInstantiator.getDataset(datasetId);
  try {
   return generateEnableStatement(dataset, spec, datasetId,
                   tableNaming.getTableName(datasetId, spec.getProperties()), truncating);
  } finally {
   Closeables.closeQuietly(dataset);
  }
 } catch (IOException e) {
  throw new ExploreException("Exception while trying to instantiate dataset " + datasetId, e);
 }
}

Dataset dataset;
try {
 dataset = datasetInstantiator.getDataset(datasetId);
} catch (Exception e) {
 LOG.error("Exception instantiating dataset {}.", datasetId, e);

Dataset dataset;
try {
 dataset = datasetInstantiator.getDataset(datasetId);
} catch (Exception e) {
 LOG.error("Exception instantiating dataset {}.", datasetId, e);

Dataset dataset = datasetInstantiator.getDataset(datasetId);
try {
 alterStatements = generateAlterStatements(datasetId, tableName, dataset, spec, oldSpec);

Dataset dataset = datasetInstantiator.getDataset(datasetId);
try {
 alterStatements = generateAlterStatements(datasetId, tableName, dataset, spec, oldSpec);

private String generateDisableStatement(DatasetId datasetId, DatasetSpecification spec) throws ExploreException {
 String tableName = tableNaming.getTableName(datasetId, spec.getProperties());
 String databaseName = ExploreProperties.getExploreDatabaseName(spec.getProperties());
 // If table does not exist, nothing to be done
 try {
  exploreService.getTableInfo(datasetId.getNamespace(), databaseName, tableName);
 } catch (TableNotFoundException e) {
  // Ignore exception, since this means table was not found.
  return null;
 }
 try (SystemDatasetInstantiator datasetInstantiator = datasetInstantiatorFactory.create()) {
  Dataset dataset = datasetInstantiator.getDataset(datasetId);
  try {
   if (dataset instanceof FileSet || dataset instanceof PartitionedFileSet) {
    // do not drop the explore table that dataset is reusing an existing table
    if (FileSetProperties.isUseExisting(spec.getProperties())) {
     return null;
    }
   }
   return generateDeleteStatement(dataset, databaseName, tableName);
  } finally {
   Closeables.closeQuietly(dataset);
  }
 } catch (IOException e) {
  LOG.error("Exception creating dataset classLoaderProvider for dataset {}.", datasetId, e);
  throw new ExploreException("Exception instantiating dataset " + datasetId);
 }
}

private String generateDisableStatement(DatasetId datasetId, DatasetSpecification spec) throws ExploreException {
 String tableName = tableNaming.getTableName(datasetId, spec.getProperties());
 String databaseName = ExploreProperties.getExploreDatabaseName(spec.getProperties());
 // If table does not exist, nothing to be done
 try {
  exploreService.getTableInfo(datasetId.getNamespace(), databaseName, tableName);
 } catch (TableNotFoundException e) {
  // Ignore exception, since this means table was not found.
  return null;
 }
 try (SystemDatasetInstantiator datasetInstantiator = datasetInstantiatorFactory.create()) {
  Dataset dataset = datasetInstantiator.getDataset(datasetId);
  try {
   if (dataset instanceof FileSet || dataset instanceof PartitionedFileSet) {
    // do not drop the explore table that dataset is reusing an existing table
    if (FileSetProperties.isUseExisting(spec.getProperties())) {
     return null;
    }
   }
   return generateDeleteStatement(dataset, databaseName, tableName);
  } finally {
   Closeables.closeQuietly(dataset);
  }
 } catch (IOException e) {
  LOG.error("Exception creating dataset classLoaderProvider for dataset {}.", datasetId, e);
  throw new ExploreException("Exception instantiating dataset " + datasetId);
 }
}

/**
 * Creates a new instance of a dataset based on the given information.
 */
private Dataset createDatasetInstance(DatasetCacheKey key, boolean recordLineage) {
 DatasetId datasetId = new DatasetId(key.getNamespace(), key.getName());
 Dataset dataset = instantiator.getDataset(datasetId, key.getArguments(), key.getAccessType());
 if (dataset instanceof MeteredDataset && metricsContext != null) {
  ((MeteredDataset) dataset).setMetricsCollector(
   metricsContext.childContext(Constants.Metrics.Tag.DATASET, key.getName()));
 }
 if (recordLineage) {
  instantiator.writeLineage(datasetId, key.getAccessType());
 }
 return dataset;
}

/**
 * Creates a new instance of a dataset based on the given information.
 */
private Dataset createDatasetInstance(DatasetCacheKey key, boolean recordLineage) {
 DatasetId datasetId = new DatasetId(key.getNamespace(), key.getName());
 Dataset dataset = instantiator.getDataset(datasetId, key.getArguments(), key.getAccessType());
 if (dataset instanceof MeteredDataset && metricsContext != null) {
  ((MeteredDataset) dataset).setMetricsCollector(
   metricsContext.childContext(Constants.Metrics.Tag.DATASET, key.getName()));
 }
 if (recordLineage) {
  instantiator.writeLineage(datasetId, key.getAccessType());
 }
 return dataset;
}

Dataset dataset = datasetInstantiator.getDataset(datasetId);
if (dataset == null) {
 throw new SerDeException("Could not find dataset " + datasetId);

Dataset dataset = datasetInstantiator.getDataset(datasetId);
if (dataset == null) {
 throw new SerDeException("Could not find dataset " + datasetId);