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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.document;
import com.yahoo.language.process.StemMode;
import java.util.logging.Logger;
/**
* <p>The stemming setting of a field. This describes how the search engine
* should transform content of this field into base forms (stems) to increase
* recall (find "car" when you search for "cars" etc.).</p>
*
* @author bratseth
*/
public enum Stemming {
/** No stemming */
NONE("none"),
/** @deprecated incorrectly don't stem at all */
@Deprecated
ALL("all"),
/** select shortest possible stem */
SHORTEST("shortest"),
/** select the "best" stem alternative */
BEST("best"),
/** index multiple stems */
MULTIPLE("multiple");
private static Logger log=Logger.getLogger(Stemming.class.getName());
private final String name;
/**
* Returns the stemming object for the given string.
* The legal stemming names are the stemming constants in any capitalization.
*
* @throws IllegalArgumentException if there is no stemming type with the given name
*/
@SuppressWarnings("deprecation")
public static Stemming get(String stemmingName) {
try {
Stemming stemming = Stemming.valueOf(stemmingName.toUpperCase());
if (stemming.equals(ALL)) {
log.warning("note: stemming ALL is the same as stemming mode SHORTEST");
stemming = SHORTEST;
}
return stemming;
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("'" + stemmingName + "' is not a valid stemming setting");
}
}
Stemming(String name) {
this.name = name;
}
public String getName() { return name; }
public String toString() {
return "stemming " + name;
}
@SuppressWarnings("deprecation")
public StemMode toStemMode() {
switch(this) {
case SHORTEST: return StemMode.SHORTEST;
case MULTIPLE: return StemMode.ALL;
case BEST : return StemMode.BEST;
case NONE: return StemMode.NONE;
case ALL: return StemMode.SHORTEST; // Intentional; preserve historic behavior
default: throw new IllegalStateException("Inconvertible stem mode " + this);
}
}
}
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