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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
/**
* An interface used for anything which may be addressed using an external,
* unique ID in the query tree in the backend.
*
* @author Steinar Knutsen
*/
public interface TaggableItem {
int getUniqueID();
void setUniqueID(int id);
boolean hasUniqueID();
/**
* Set the connectivity to another term in the same query tree.
* This is used to influence ranking features taking proximity into account: nativeRank and a subset of the
* fieldMatch features.
* <p>
* By default consecutive query terms are 'somewhat' connected, meaning ranking features will score higher in documents
* where the terms are found close to each other. This effect can be increased or decreased by manipulating the
* connectivity value. Typical use is to increase the connectivity between terms in the query that we believe are
* semantically connected. E.g., in the query 'new york hotel', it is a good idea to increase the connectivity between
* "new" and "york" to ensure that a document containing "List of hotels in New York" is ranked above one containing
* "List of new hotels in York".
*
* @param item the item this should be connected to - in practice the previous item in the query.
* @param connectivity a value between 0 (none) and 1 (maximal), defining the connectivity between this and the
* argument item. The default connectivity is 0.1.
*/
void setConnectivity(Item item, double connectivity);
Item getConnectedItem();
double getConnectivity();
/**
* Used for setting explicit term significance (in the tf/idf sense) to a single term or phrase,
* relative to the rest of the query.
* This influences ranking features which take term significance into account, and overrides the default
* partial corpus based term significance computation in the backend.
*/
void setSignificance(double significance);
boolean hasExplicitSignificance();
void setExplicitSignificance(boolean significance);
double getSignificance();
}
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