org.apache.solr.handler.dataimport

## Class Transformer

- java.lang.Object
- - org.apache.solr.handler.dataimport.Transformer

- Direct Known Subclasses:
    ClobTransformer, DateFormatTransformer, HTMLStripTransformer, LogTransformer, NumberFormatTransformer, RegexTransformer, ScriptTransformer, TemplateTransformer

      public abstract class Transformer
      extends Object

  Use this API to implement a custom transformer for any given entity

  Implementations of this abstract class must provide a public no-args constructor.

  Refer to http://wiki.apache.org/solr/DataImportHandler for more details.

  This API is experimental and may change in the future.

  Since:
    solr 1.3

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `Transformer()`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract Object` | `transformRow(Map<String,Object> row, Context context)` The input is a row of data and the output has to be a new row.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### Transformer

          public Transformer()

  - ### Method Detail

    - #### transformRow

          public abstract Object transformRow(Map<String,Object> row,
                                              Context context)

      The input is a row of data and the output has to be a new row.
      Parameters:
        `context` - The current context
        `row` - A row of data
      Returns:
        The changed data. It must be a `Map`<`String`, `Object`> if it returns only one row or if there are multiple rows to be returned it must be a `List`<`Map`<`String`, `Object`>>

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