org.gcube.searchsystem.planning.preprocessing

Interface Preprocessor

public interface Preprocessor

Classes that implement this interface, can apply static rules, filters, enhance the query tree with information(personalization, semantics, ...) etc. Their product will be the input to the planner.

Author:

vasilis verroios - DI NKUA

Method Summary

Methods

Modifier and Type	Method and Description
search.library.util.cql.query.tree.GCQLNode	preprocess(search.library.util.cql.query.tree.GCQLNode root) Receives the root of a CQL tree, preprocess it and returns a new CQL tree.

Method Detail

preprocess

search.library.util.cql.query.tree.GCQLNode preprocess(search.library.util.cql.query.tree.GCQLNode root)
                                                       throws CQLTreeSyntaxException

Receives the root of a CQL tree, preprocess it and returns a new CQL tree. The preprocessing may consist of applying static rules, filters, query enhancement, etc.

Parameters:

root - - the CQL tree root

Returns:

the preprocessed CQL tree

Throws:

CQLTreeSyntaxException - - when the input tree is not in a valid state (this case is possible when a chain of proprocessors is applied sequentially)