/*
 * EliasDB
 *
 * Copyright 2016 Matthias Ladkau. All rights reserved.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

package graph

/*
IndexQuery models the interface to the full text search index.
*/
type IndexQuery interface {

	/*
		LookupPhrase finds all nodes where an attribute contains a certain
		phrase. This call returns a list of node keys which contain the phrase
		at least once.
	*/
	LookupPhrase(attr, phrase string) ([]string, error)

	/*
		LookupWord finds all nodes where an attribute contains a certain word.
		This call returns a map which maps node key to a list of word positions.
	*/
	LookupWord(attr, word string) (map[string][]uint64, error)

	/*
		LookupValue finds all nodes where an attribute has a certain value.
		This call returns a list of node keys.
	*/
	LookupValue(attr, value string) ([]string, error)
}