DataImport (SmartClient Enterprise Server API 11.0p (2022-11-10))

java.lang.Object
- com.isomorphic.base.Base
- - com.isomorphic.tools.DataImport

```
public class DataImport
extends Base
```
DataImport contains methods that can be used to import data from a test data file to the List of Maps format commonly used for DataSource records (importToRows()), or directly into a DataSource (importToDataSource()).
By default the input file is expected to contain comma-delimited data like a .csv file, but JSON and XML are also supported.
Imported data may be transformed during import, for details search SmartClient Reference for "dataSourceField.importStrategy".

See Also:

ServletTools.loadWebRootFile(path)

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`DataImport.ImportFormat` Import formats that can be used `DataImport.ImportFormat.CSV` `DataImport.ImportFormat.JSON` `DataImport.ImportFormat.XML` `DataImport.ImportFormat.AUTO`
`class`	`DataImport.ParseDate` Implements the translate method of the DataTranslator interface.
`class`	`DataImport.ParseDateTime` Implements the translate method of the DataTranslator interface.
`class`	`DataImport.ParseFloat` Implements the translate method of the DataTranslator interface.
`class`	`DataImport.ParseNumber` Implements the translate method of the DataTranslator interface.
`class`	`DataImport.ParseText` Implements the translate method of the DataTranslator interface.
`class`	`DataImport.ParseTime` Implements the translate method of the DataTranslator interface.

Constructor Summary

Constructors
Constructor and Description
`DataImport()` Create a DataImport configured for CSV import with default quote string.
`DataImport(DataImport.ImportFormat theInputType, java.lang.String theDelimiter)` Create a DataImport configured for the specified import format.
`DataImport(DataImport.ImportFormat theInputType, java.lang.String theDelimiter, java.lang.String theQuoteString)` Create a DataImport configured for the specified import format and quote string.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`java.util.List`	`importDataSourceRecords(java.io.Reader in, java.util.List columns, java.util.Map translators, java.lang.String dataSourceName)` See `DataImport.importDataSourceRecords(Reader, Map, Map, String)`
`java.util.List`	`importDataSourceRecords(java.io.Reader in, java.util.List columns, java.lang.String dataSourceName)` See `DataImport.importDataSourceRecords(Reader, Map, Map, String)`
`java.util.List`	`importDataSourceRecords(java.io.Reader in, java.util.Map columnRemap, java.util.Map translators, java.lang.String dataSourceName)` Import from `InputStream` in either CSV/TSV or JSON format and return the imported records in a List.
`java.util.List`	`importDataSourceRecords(java.io.Reader in, java.util.Map columnRemap, java.lang.String dataSourceName)` See `DataImport.importDataSourceRecords(Reader, Map, Map, String)`
`java.util.List`	`importDataSourceRecords(java.io.Reader in, java.lang.String dataSourceName)` See `DataImport.importDataSourceRecords(Reader, Map, Map, String)`
`long`	`importToDataSource(java.io.Reader in, java.util.List columns, java.util.Map translators, java.lang.String tableName)` See `DataImport.importToDataSource(Reader, Map, Map, String)`
`long`	`importToDataSource(java.io.Reader in, java.util.List columns, java.lang.String tableName)` See `DataImport.importToDataSource(Reader, Map, Map, String)`
`long`	`importToDataSource(java.io.Reader in, java.util.Map columnRemap, java.util.Map translators, java.lang.String dataSourceName)` Import from `InputStream` in either CSV/TSV or JSON format and save the imported records to the target SQLDataSource.
`long`	`importToDataSource(java.io.Reader in, java.util.Map columnRemap, java.lang.String tableName)` See `DataImport.importToDataSource(Reader, Map, Map, String)`
`long`	`importToDataSource(java.io.Reader in, java.lang.String dataSourceName)` See `DataImport.importToDataSource(Reader, Map, Map, String)`
`java.util.List`	`importToRows(java.io.Reader in)` See `DataImport.importToRows(Reader, Map, Map)`
`java.util.List`	`importToRows(java.io.Reader in, java.util.List columns)` See `DataImport.importToRows(Reader, Map, Map)`
`java.util.List`	`importToRows(java.io.Reader in, java.util.List columns, java.util.Map translators)` See `DataImport.importToRows(Reader, Map, Map)`
`java.util.List`	`importToRows(java.io.Reader in, java.util.Map columnRemap)` See `DataImport.importToRows(Reader, Map, Map)`
`java.util.List`	`importToRows(java.io.Reader in, java.util.Map columnRemap, java.util.Map translators)` Import from `InputStream` in either CSV/TSV or JSON format to a List of Maps.
`void`	`setPopulateDisplayFields(boolean populate)` If true, the import process populates displayField values with the import data in cases where it transforms the underlying value using a related display record.

- Constructor Detail
  - DataImport
```
public DataImport()
```
    Create a DataImport configured for CSV import with default quote string.
  - DataImport
```
public DataImport(DataImport.ImportFormat theInputType,
                  java.lang.String theDelimiter)
```
    Create a DataImport configured for the specified import format.
    
    Parameters:
    
    theInputType - the form of the data input.
    
    theDelimiter - a java.lang.String character used as the delimiter, by default, ","
  - DataImport
```
public DataImport(DataImport.ImportFormat theInputType,
                  java.lang.String theDelimiter,
                  java.lang.String theQuoteString)
```
    Create a DataImport configured for the specified import format and quote string.
    
    Parameters:
    
    theInputType - the form of the data input.
    
    theDelimiter - a java.lang.String character used as the delimiter, by default, ","
    
    theQuoteString - for delimited input only, a java.lang.String ("/"", by default) to signify a double quote since a double quote would otherwise be misinterpreted as the end of a string by the parser
- Method Detail
  - setPopulateDisplayFields
```
public void setPopulateDisplayFields(boolean populate)
```
    If true, the import process populates displayField values with the import data in cases where it transforms the underlying value using a related display record. For example, if a field "countryId" has a displayField of "countryName". If this flag is set then as part of the process of importing a "countryId" value and transforming the import value "United States" into the corresponding id value, the importer also sets "countryName" on that record to the display value it just transformed (ie, "United States"). By default displayFields are not populated - you must pass true to this method if you require that behavior.
    See DataSource.getRelatedDisplayRecord(String, Object, DSRequest) for more details about related display records and import transformation.
    
    Parameters:
    
    populate - If true, populate displayFields with the import values used to derive a key via a related display record. If false, just leave displayFields unpopulated
  - importToDataSource
```
public long importToDataSource(java.io.Reader in,
                               java.lang.String dataSourceName)
                        throws java.lang.Exception
```
    See DataImport.importToDataSource(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importToDataSource
```
public long importToDataSource(java.io.Reader in,
                               java.util.List columns,
                               java.lang.String tableName)
                        throws java.lang.Exception
```
    See DataImport.importToDataSource(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importToDataSource
```
public long importToDataSource(java.io.Reader in,
                               java.util.Map columnRemap,
                               java.lang.String tableName)
                        throws java.lang.Exception
```
    See DataImport.importToDataSource(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importToDataSource
```
public long importToDataSource(java.io.Reader in,
                               java.util.List columns,
                               java.util.Map translators,
                               java.lang.String tableName)
                        throws java.lang.Exception
```
    See DataImport.importToDataSource(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importToDataSource
```
public long importToDataSource(java.io.Reader in,
                               java.util.Map columnRemap,
                               java.util.Map translators,
                               java.lang.String dataSourceName)
                        throws java.lang.Exception
```
    Import from InputStream in either CSV/TSV or JSON format and save the imported records to the target SQLDataSource.
    An optional columnRemap can be provided to translate between column names in CSV/TSV or property names in JSON to the field names of the DataSource. Use null as a Map value to cause data for a column to be discarded.
    For signatures that take "List columns", this is the same as providing a columnRemap does not rename any input fields.
    If no columnRemap or incomplete columnRemap is provided, column names that are not re-mapped will be matched to DataSource fields by comparing to both the field name and field title, ignoring letter case. Any column name that isn't matched to a DataSource field is discarded.
    For delimited input, the header line may be omitted. DataImport will attempt to automatically detect whether the first line is a header by attempting to match the data to expected column names. If the header line is omitted, the columns will be assumed to be in the order of the columnRemap if provided (use a class such as LinkedHashMap to preserve order), or in the order of the DataSource fields if no columnRemap is provided. Any extra columns will be discarded.
    Any SimpleType that inherits from the given base type also uses the same translators: DataImport.ParseDate
    DataImport.ParseDateTime
    DataImport.ParseTime
    DataImport.ParseText
    DataImport.ParseNumber
    DataImport.ParseFloat
    
    For CSV/TSV and JSON data a set of translators can be provided to in the format expected by importToRows. By default, the following translations are applied based on DataSource field type:
    - int, integer, sequence or number: parsed as Java Integer
    - float or decimal: parsed as a Java Double
    - date: parsed as a date value by standard Java DataFormat, lenient parsing in current locale
    - datetime: parsed as a datetime value by standard Java DataFormat, lenient parsing in current locale
    Parameters:
    
    in - input file as a Reader
    
    columnRemap - an optional mapping between the input data and the field names of the target DataSource.
    
    translators - optional translators to use to transform the data from the input to the type the DataSourceField expects
    
    dataSourceName - the ID of the target DataSource
    
    Returns:
    
    1 if the import was successful, and 0 otherwise
    
    Throws:
    
    java.lang.Exception
  - importDataSourceRecords
```
public java.util.List importDataSourceRecords(java.io.Reader in,
                                              java.lang.String dataSourceName)
                                       throws java.lang.Exception
```
    See DataImport.importDataSourceRecords(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importDataSourceRecords
```
public java.util.List importDataSourceRecords(java.io.Reader in,
                                              java.util.List columns,
                                              java.lang.String dataSourceName)
                                       throws java.lang.Exception
```
    See DataImport.importDataSourceRecords(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importDataSourceRecords
```
public java.util.List importDataSourceRecords(java.io.Reader in,
                                              java.util.Map columnRemap,
                                              java.lang.String dataSourceName)
                                       throws java.lang.Exception
```
    See DataImport.importDataSourceRecords(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importDataSourceRecords
```
public java.util.List importDataSourceRecords(java.io.Reader in,
                                              java.util.List columns,
                                              java.util.Map translators,
                                              java.lang.String dataSourceName)
                                       throws java.lang.Exception
```
    See DataImport.importDataSourceRecords(Reader, Map, Map, String)
    
    Throws:
    
    java.lang.Exception
  - importDataSourceRecords
```
public java.util.List importDataSourceRecords(java.io.Reader in,
                                              java.util.Map columnRemap,
                                              java.util.Map translators,
                                              java.lang.String dataSourceName)
                                       throws java.lang.Exception
```
    Import from InputStream in either CSV/TSV or JSON format and return the imported records in a List.
    An optional columnRemap can be provided to translate between column names in CSV/TSV or property names in JSON to the field names of the DataSource. Use null as a Map value to cause data for a column to be discarded.
    If no columnRemap or incomplete columnRemap is provided, column names that are not re-mapped will be matched to DataSource fields by comparing to both the field name and field title, ignoring letter case. Any column name that isn't matched to a DataSource field is discarded.
    For delimited input, the header line may be omitted. DataImport will attempt to automatically detect whether the first line is a header by attempting to match the data to expected column names. If the header line is omitted, the columns will be assumed to be in the order of the columnRemap if provided (use a class such as LinkedHashMap to preserve order), or in the order of the DataSource fields if no columnRemap is provided. Any extra columns will be discarded.
    Any SimpleType that inherits from the given base type also uses the same translators: DataImport.ParseDate
    DataImport.ParseDateTime
    DataImport.ParseTime
    DataImport.ParseText
    DataImport.ParseNumber
    DataImport.ParseFloat
    
    For CSV/TSV and JSON data a set of translators can be provided to in the format expected by importToRows. By default, the following translations are applied based on DataSource field type:
    - int, integer, sequence or number: parsed as Java Integer
    - float or decimal: parsed as a Java Double
    - date: parsed as a date value by standard Java DataFormat, lenient parsing in current locale
    - datetime: parsed as a datetime value by standard Java DataFormat, lenient parsing in current locale
    Parameters:
    
    in - input file as a Reader
    
    columnRemap - an optional mapping between the input data and the field names of the target DataSource.
    
    translators - optional translators to use to transform the data from the input to the type the DataSourceField expects
    
    dataSourceName - the ID of the target DataSource
    
    Returns:
    
    the imported records in a List
    
    Throws:
    
    java.lang.Exception
  - importToRows
```
public java.util.List importToRows(java.io.Reader in)
                            throws java.lang.Exception
```
    See DataImport.importToRows(Reader, Map, Map)
    
    Throws:
    
    java.lang.Exception
  - importToRows
```
public java.util.List importToRows(java.io.Reader in,
                                   java.util.List columns)
                            throws java.lang.Exception
```
    See DataImport.importToRows(Reader, Map, Map)
    
    Throws:
    
    java.lang.Exception
  - importToRows
```
public java.util.List importToRows(java.io.Reader in,
                                   java.util.Map columnRemap)
                            throws java.lang.Exception
```
    See DataImport.importToRows(Reader, Map, Map)
    
    Throws:
    
    java.lang.Exception
  - importToRows
```
public java.util.List importToRows(java.io.Reader in,
                                   java.util.List columns,
                                   java.util.Map translators)
                            throws java.lang.Exception
```
    See DataImport.importToRows(Reader, Map, Map)
    
    Throws:
    
    java.lang.Exception
  - importToRows
```
public java.util.List importToRows(java.io.Reader in,
                                   java.util.Map columnRemap,
                                   java.util.Map translators)
                            throws java.lang.Exception
```
    Import from InputStream in either CSV/TSV or JSON format to a List of Maps.
    This API essentially performs part of the steps of importToDataSource() but does not actually insert records into a DataSource, instead just returning a List of Maps which could then be inserted into a DataSource, validated further, serialized to XML or otherwise processed.
    Input format and delimiter is specified in the constructor or via setInputType(). CSV/TSV delimited data is expected to have a leading line providing column names, which will be used as keys for the Maps returned.
    An optional columnRemap can be provided to translate between column names in CSV/TSV or property names in JSON to a different set of column names to be used in the output. Use a null as the value of a key in this Map to indicate that data for the column should be discarded. The matching process against the keys of the columnRemap is case-insensitive.
    For signatures that take "List columns", this is the same as providing a columnRemap does not rename any input fields.
    An optional set of translators can be provided to translate to desired Java types. The translators Map should be a map from column name (in the CSV/TSV file - not the remapped column name) to the fully qualified name of a specific inner class that will do the translation (for example: "com.isomorphic.tools.DataImport.ParseText"). The class invokes its own translate method which takes any Java Object and produces any Java Object as output.
    If the input type is set to autoDetect, importToRows() will attempt to autodetect the input format. In addition, for delimited input, if the delimiter is unspecified, importToRows() will attempt to detect whether the delimiter is a comma (",") or tab ("\t"), and will throw an exception if auto-detection fails.
    Example usage for CSV parsing (which is the default input type and delimiter):
```
 InputStream is = ServletTools.loadWebRootFile("files/portfolios.csv");
 Reader reader = new InputStreamReader(is);
 List portfolios = new DataImport().importToRows(reader);
 
```
    Parameters:
    
    in - a character-stream reader set to read the data input stream
    
    columnRemap - optional mapping from input column/property names to output Map keys.
    
    translators - optional list of translators
    
    Returns:
    
    imported rows as a List of Maps
    
    Throws:
    
    java.lang.Exception

Class DataImport

Nested Class Summary

Constructor Summary

Method Summary

Constructor Detail

DataImport

DataImport

DataImport

Method Detail

setPopulateDisplayFields

importToDataSource

importToDataSource

importToDataSource

importToDataSource

importToDataSource

importDataSourceRecords

importDataSourceRecords

importDataSourceRecords

importDataSourceRecords

importDataSourceRecords

importToRows

importToRows

importToRows

importToRows

importToRows