# Package org.apache.lucene.queryparser.flexible.core.builders

package org.apache.lucene.queryparser.flexible.core.builders
Necessary classes to implement query builders.

## Query Parser Builders

The package `org.apache.lucene.queryParser.builders` contains the interface that builders must implement, it also contain a utility `QueryTreeBuilder`, which walks the tree and call the Builder for each node in the tree. Builder normally convert QueryNode Object into a Lucene Query Object, and normally it's a one-to-one mapping class.

But other builders implementations can by written to convert QueryNode objects to other non lucene objects.

- Related Packages
  Package
  Description
  org.apache.lucene.queryparser.flexible.core
  Core classes of the flexible query parser framework.
- Class
  Description
  QueryBuilder
  This interface is used by implementors classes that builds some kind of object from a query tree.
  QueryTreeBuilder
  This class should be used when there is a builder for each type of node.