FieldReaderDataSource (Solr 8.1.0 API)

java.lang.Object
- org.apache.solr.handler.dataimport.DataSource<Reader>
- - org.apache.solr.handler.dataimport.FieldReaderDataSource

```
public class FieldReaderDataSource
extends DataSource<Reader>
```
This can be useful for users who have a DB field containing xml and wish to use a nested XPathEntityProcessor
The datasouce may be configured as follows
<datasource name="f1" type="FieldReaderDataSource" />
The entity which uses this datasource must keep the url value as the variable name url="field-name"
The fieldname must be resolvable from VariableResolver
This may be used with any EntityProcessor which uses a DataSource<Reader> eg: XPathEntityProcessor
Supports String, BLOB, CLOB data types and there is an extra field (in the entity) 'encoding' for BLOB types

Since:

1.4

Field Summary

Fields
Modifier and Type Field Description

protected String dataField

protected VariableResolver vr

Constructor Summary

Constructors
Constructor Description

FieldReaderDataSource()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Cleans up resources of this DataSource after use.
`Reader`	`getData(String query)`	Get records for the given query.The return type depends on the implementation .
`void`	`init(Context context, Properties initProps)`	Initializes the DataSource with the `Context` and initialization properties.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - vr
```
protected VariableResolver vr
```
  - dataField
```
protected String dataField
```
- Constructor Detail
  - FieldReaderDataSource
```
public FieldReaderDataSource()
```
- Method Detail
  - init
```
public void init(Context context,
                 Properties initProps)
```
    Description copied from class: DataSource
    
    Initializes the DataSource with the Context and initialization properties.
    This is invoked by the DataImporter after creating an instance of this class.
    
    Specified by:
    
    init in class DataSource<Reader>
  - getData
```
public Reader getData(String query)
```
    Description copied from class: DataSource
    
    Get records for the given query.The return type depends on the implementation .
    
    Specified by:
    
    getData in class DataSource<Reader>
    
    Parameters:
    
    query - The query string. It can be a SQL for JdbcDataSource or a URL for HttpDataSource or a file location for FileDataSource or a custom format for your own custom DataSource.
    
    Returns:
    
    Depends on the implementation. For instance JdbcDataSource returns an Iterator<Map <String,Object>>
  - close
```
public void close()
```
    Description copied from class: DataSource
    
    Cleans up resources of this DataSource after use.
    
    Specified by:
    
    close in class DataSource<Reader>