org.apache.solr.response.transform

Class DocTransformer

java.lang.Object

org.apache.solr.response.transform.DocTransformer

Direct Known Subclasses:

DocTransformers, RenameFieldTransformer, TransformerWithContext, ValueSourceAugmenter

public abstract class DocTransformer
extends Object

A DocTransformer can add, remove or alter a Document before it is written out to the Response. For instance, there are implementations that can put explanations inline with a document, add constant values and mark items as being artificially boosted (see QueryElevationComponent)

New instance for each request

See Also:

TransformerFactory

Constructor Summary

Constructors

Constructor and Description
DocTransformer()

Method Summary

Methods

Modifier and Type	Method and Description
abstract String	getName()
void	setContext(TransformContext context) This is called before transform and sets
String	toString()
abstract void	transform(SolrDocument doc, int docid) This is where implementations do the actual work

Methods inherited from class java.lang.Object

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

Constructor Detail

DocTransformer

public DocTransformer()

Method Detail

getName

public abstract String getName()

Returns:

The name of the transformer

setContext

public void setContext(TransformContext context)

This is called before transform and sets

Parameters:

context - The TransformContext stores information about the current state of things in Solr that may be useful for doing transformations.

transform

public abstract void transform(SolrDocument doc,
             int docid)
                        throws IOException

This is where implementations do the actual work

Parameters:

doc - The document to alter

docid - The Lucene internal doc id

Throws:

IOException - If there is a low-level I/O error.

toString

public String toString()

Overrides:

toString in class Object