Package org.apache.calcite.adapter.csv

Class CsvSchema

java.lang.Object

org.apache.calcite.schema.impl.AbstractSchema

org.apache.calcite.adapter.csv.CsvSchema

All Implemented Interfaces:

Schema

public class CsvSchema
extends AbstractSchema

Schema mapped onto a directory of CSV files. Each table in the schema is a CSV file in that directory.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.schema.impl.AbstractSchema

AbstractSchema.Factory

Nested classes/interfaces inherited from interface org.apache.calcite.schema.Schema

Schema.TableType

Field Summary

Fields

Modifier and Type	Field	Description
private java.io.File	directoryFile
private CsvTable.Flavor	flavor
private java.util.Map<java.lang.String,Table>	tableMap

Constructor Summary

Constructors

Constructor	Description
CsvSchema(java.io.File directoryFile, CsvTable.Flavor flavor)	Creates a CSV schema.

Method Summary

Modifier and Type	Method	Description
private Table	createTable(Source source)	Creates different sub-type of table based on the "flavor" attribute.
private java.util.Map<java.lang.String,Table>	createTableMap()
protected java.util.Map<java.lang.String,Table>	getTableMap()	Returns a map of tables in this schema by name.
private static java.lang.String	trim(java.lang.String s, java.lang.String suffix)	Looks for a suffix on a string and returns either the string with the suffix removed or the original string.
private static java.lang.String	trimOrNull(java.lang.String s, java.lang.String suffix)	Looks for a suffix on a string and returns either the string with the suffix removed or null.

Methods inherited from class org.apache.calcite.schema.impl.AbstractSchema

getExpression, getFunctionMultimap, getFunctionNames, getFunctions, getSubSchema, getSubSchemaMap, getSubSchemaNames, getTable, getTableNames, getType, getTypeMap, getTypeNames, isMutable, snapshot

Methods inherited from class java.lang.Object

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

Field Detail

directoryFile

private final java.io.File directoryFile

flavor

private final CsvTable.Flavor flavor

tableMap

private java.util.Map<java.lang.String,Table> tableMap

Constructor Detail

CsvSchema

public CsvSchema(java.io.File directoryFile,
                 CsvTable.Flavor flavor)

Creates a CSV schema.

Parameters:

directoryFile - Directory that holds .csv files

flavor - Whether to instantiate flavor tables that undergo query optimization

Method Detail

trim

private static java.lang.String trim(java.lang.String s,
                                     java.lang.String suffix)

Looks for a suffix on a string and returns either the string with the suffix removed or the original string.

trimOrNull

private static java.lang.String trimOrNull(java.lang.String s,
                                           java.lang.String suffix)

Looks for a suffix on a string and returns either the string with the suffix removed or null.

getTableMap

protected java.util.Map<java.lang.String,Table> getTableMap()

Description copied from class: AbstractSchema

Returns a map of tables in this schema by name.

The implementations of AbstractSchema.getTableNames() and AbstractSchema.getTable(String) depend on this map. The default implementation of this method returns the empty map. Override this method to change their behavior.

Overrides:

getTableMap in class AbstractSchema

Returns:

Map of tables in this schema by name

createTableMap

private java.util.Map<java.lang.String,Table> createTableMap()

createTable

private Table createTable(Source source)

Creates different sub-type of table based on the "flavor" attribute.