org.apache.metamodel.csv

Class CsvDataContext

java.lang.Object

org.apache.metamodel.AbstractDataContext

org.apache.metamodel.QueryPostprocessDataContext

org.apache.metamodel.csv.CsvDataContext

All Implemented Interfaces:

HasReadTypeConverters, DataContext, UpdateableDataContext

public final class CsvDataContext
extends QueryPostprocessDataContext
implements UpdateableDataContext

DataContext implementation for reading CSV files.

Field Summary

Fields inherited from class org.apache.metamodel.QueryPostprocessDataContext

INFORMATION_SCHEMA_NAME

Constructor Summary

Constructors

Constructor and Description
CsvDataContext(File file) Constructs a CSV DataContext based on a file
CsvDataContext(File file, CsvConfiguration configuration) Constructs a CSV DataContext based on a file The file provided can be either existing or non-existing.
CsvDataContext(InputStream inputStream, CsvConfiguration configuration) Constructs a CSV DataContext based on an InputStream
CsvDataContext(Resource resource, CsvConfiguration configuration)
CsvDataContext(URL url, CsvConfiguration configuration) Constructs a CSV DataContext based on a URL

Method Summary

Modifier and Type	Method and Description
protected com.opencsv.CSVReader	createCsvReader(BufferedReader reader)
protected com.opencsv.CSVReader	createCsvReader(int skipLines)
protected Number	executeCountQuery(Table table, List<FilterItem> whereItems, boolean functionApproximationAllowed)
UpdateSummary	executeUpdate(UpdateScript update)
CsvConfiguration	getConfiguration() Gets the CSV configuration used
protected org.apache.metamodel.csv.CsvSchema	getMainSchema()
protected String	getMainSchemaName()
Resource	getResource() Gets the resource that is being read from.
protected boolean	isWritable()
DataSet	materializeMainSchemaTable(Table table, Column[] columns, int maxRows)

Methods inherited from class org.apache.metamodel.QueryPostprocessDataContext

addConverter, executePrimaryKeyLookupQuery, executeQuery, getDefaultSchemaName, getSchemaByNameInternal, getSchemaNamesInternal, isMainSchemaTable, isScalarFunctionMaterialized, materializeFromItem, materializeMainSchemaTable, materializeMainSchemaTable, materializeMainSchemaTable, materializeTable

Methods inherited from class org.apache.metamodel.AbstractDataContext

compileQuery, executeQuery, executeQuery, getColumnByQualifiedLabel, getDefaultSchema, getSchemaByName, getSchemaNames, getSchemas, getTableByQualifiedLabel, isQualifiedPathDelim, onSchemaCacheRefreshed, parseQuery, query, refreshSchemas

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.metamodel.DataContext

compileQuery, executeQuery, executeQuery, executeQuery, getColumnByQualifiedLabel, getDefaultSchema, getSchemaByName, getSchemaNames, getSchemas, getTableByQualifiedLabel, parseQuery, query, refreshSchemas

Constructor Detail

CsvDataContext

public CsvDataContext(File file,
                      CsvConfiguration configuration)

Constructs a CSV DataContext based on a file The file provided can be either existing or non-existing. In the case of non-existing files, a file will be automatically created when a CREATE TABLE update is executed on the DataContext.

Parameters:

file -

configuration -

CsvDataContext

public CsvDataContext(Resource resource,
                      CsvConfiguration configuration)

CsvDataContext

public CsvDataContext(URL url,
                      CsvConfiguration configuration)

Constructs a CSV DataContext based on a URL

Parameters:

url -

configuration -

CsvDataContext

public CsvDataContext(File file)

Constructs a CSV DataContext based on a file

Parameters:

file -

CsvDataContext

public CsvDataContext(InputStream inputStream,
                      CsvConfiguration configuration)

Constructs a CSV DataContext based on an InputStream

Parameters:

inputStream -

configuration -

Method Detail

getConfiguration

public CsvConfiguration getConfiguration()

Gets the CSV configuration used

Returns:

a CSV configuration

getResource

public Resource getResource()

Gets the resource that is being read from.

Returns:

executeCountQuery

protected Number executeCountQuery(Table table,
                                   List<FilterItem> whereItems,
                                   boolean functionApproximationAllowed)

Overrides:

executeCountQuery in class QueryPostprocessDataContext

materializeMainSchemaTable

public DataSet materializeMainSchemaTable(Table table,
                                          Column[] columns,
                                          int maxRows)

Specified by:

materializeMainSchemaTable in class QueryPostprocessDataContext

createCsvReader

protected com.opencsv.CSVReader createCsvReader(int skipLines)

createCsvReader

protected com.opencsv.CSVReader createCsvReader(BufferedReader reader)

getMainSchema

protected org.apache.metamodel.csv.CsvSchema getMainSchema()
                                                    throws MetaModelException

Specified by:

getMainSchema in class QueryPostprocessDataContext

Throws:

MetaModelException

getMainSchemaName

protected String getMainSchemaName()

Specified by:

getMainSchemaName in class QueryPostprocessDataContext

isWritable

protected boolean isWritable()

executeUpdate

public UpdateSummary executeUpdate(UpdateScript update)

Specified by:

executeUpdate in interface UpdateableDataContext