org.fastnate.data.csv

Class AbstractCsvDataProvider<E>

java.lang.Object

org.fastnate.data.csv.AbstractCsvReader<E>

org.fastnate.data.csv.AbstractCsvDataProvider<E>

Type Parameters:

E - The type of the generated objects

All Implemented Interfaces:

DataProvider

public abstract class AbstractCsvDataProvider<E>
extends AbstractCsvReader<E>
implements DataProvider

Base class for converters that create SQL files from CSV files.

Author:

Tobias Liefke

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractCsvDataProvider(File importPath) Initializes the converter from a path.

Method Summary

Methods

Modifier and Type	Method and Description
void	addColumnMapping(String column, String property) Defines the mapping from a column name to a property name.
void	addConverter(String column, CsvPropertyConverter<?> converter) Registers the converter to use for a specific column.
protected boolean	applyColumn(E entity, String column, String value) Converts a column value to a property value and sets that property for an entity.
void	buildEntities() Starts the generation of the SQL file from the list of CSV files.
protected <T> T	convertColumn(String column, Class<T> targetType, String value) Tries to convert the given string to a value of the given type for the given column.
protected Collection<? extends E>	createEntities(Map<String,String> row) Builds one or more entities from the given row.
protected E	createEntity() Creates a new empty entity for the current converter.
protected E	createEntity(Map<String,String> row) Builds one entity from the given row.
protected Class<E>	getEntityClass() The class of the created entities.
int	getOrder() Defaults to 0.
protected void	useTableColumns() Maps the table columns of the singular properties to the CSV columns.
void	writeEntities(EntitySqlGenerator sqlGenerator) Writes all created entities.

Methods inherited from class org.fastnate.data.csv.AbstractCsvReader

openCsvListReader, readImportFiles

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractCsvDataProvider

protected AbstractCsvDataProvider(File importPath)

Initializes the converter from a path.

Parameters:

importPath - the path to a CSV file or to a directory that contains the *.csv files

Method Detail

addColumnMapping

public void addColumnMapping(String column,
                    String property)

Defines the mapping from a column name to a property name. Only necessary, if column name is not equal to property name

Parameters:

column - the name of the column

property - the name of the property

addConverter

public void addConverter(String column,
                CsvPropertyConverter<?> converter)

Registers the converter to use for a specific column. Only nessecary, if the default converters are not enough for a specific column.

Parameters:

column - the name of the column

converter - used to convert that column from CSV to a Java value

applyColumn

protected boolean applyColumn(E entity,
                  String column,
                  String value)

Converts a column value to a property value and sets that property for an entity.

Parameters:

entity - the entity to modify

column - the name of the current column

value - the value of the property (converts the property, if nessecary)

Returns:

true if an appropriate property was found, false if a matching property was not found and #isIgnoreUnknownColumns() is true

Throws:

IllegalArgumentException - if a matching property was not found or the was not converted

buildEntities

public void buildEntities()
                   throws IOException

Starts the generation of the SQL file from the list of CSV files.

Specified by:

buildEntities in interface DataProvider

Throws:

IOException - if something happens during any possible import of the generated entities

convertColumn

protected <T> T convertColumn(String column,
                  Class<T> targetType,
                  String value)

Tries to convert the given string to a value of the given type for the given column.

Parameters:

column - the name of the column

targetType - the target type

value - the string representation of the value

Returns:

the value for the property

createEntities

protected Collection<? extends E> createEntities(Map<String,String> row)

Builds one or more entities from the given row.

Specified by:

createEntities in class AbstractCsvReader<E>

Parameters:

row - contains the mapping from the header names to the current row data

Returns:

the list of entities from that row

createEntity

protected E createEntity()

Creates a new empty entity for the current converter. Used by the default implementation of createEntities(Map).

Returns:

the new entity

createEntity

protected E createEntity(Map<String,String> row)

Builds one entity from the given row.

Parameters:

row - contains the mapping from the header names to the current row data

Returns:

the created and filled entity

getEntityClass

protected Class<E> getEntityClass()

The class of the created entities.

Returns:

the entity class

getOrder

public int getOrder()

Defaults to 0.

Specified by:

getOrder in interface DataProvider

Returns:

the order criteria

useTableColumns

protected void useTableColumns()

Maps the table columns of the singular properties to the CSV columns. Useful if the CSV file is a database export.

writeEntities

public void writeEntities(EntitySqlGenerator sqlGenerator)
                   throws IOException

Writes all created entities.

Specified by:

writeEntities in interface DataProvider

Parameters:

sqlGenerator - the SQL file generator

Throws:

IOException - if the generator throws one