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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.document;
/**
* class representing the character normalization
* we want to do on query and indexed text.
* Levels are strict subsets, so doing accent
* removal means doing codepoint normalizing
* and case normalizing also.
*/
// TODO: Missing author
public class NormalizeLevel {
/**
* The current levels are as follows:
* NONE: no changes to input text
* CODEPOINT: convert text into Unicode
* Normalization Form Compatibility Composition
* LOWERCASE: also convert text into lowercase letters
* ACCENT: do both above and remove accents on characters
*/
public enum Level {
NONE, CODEPOINT, LOWERCASE, ACCENT
}
private boolean userSpecified = false;
private Level level = Level.ACCENT;
/**
* Returns whether accents should be removed from text
*/
public boolean doRemoveAccents() { return level == Level.ACCENT; }
/**
* Construct a default (full) normalizelevel,
*/
public NormalizeLevel() {}
/**
* Construct for a specific level, possibly user specified
*
* @param level which level to use
* @param fromUser whether this was specified by the user
*/
public NormalizeLevel(Level level, boolean fromUser) {
this.level = level;
this.userSpecified = fromUser;
}
/**
* Change the current level to CODEPOINT as inferred
* by other features' needs. If the current level
* was user specified it will not change; also this
* will not increase the level.
*/
public void inferCodepoint() {
if (userSpecified) {
// ignore inferred changes if user specified something
return;
}
// do not increase level
if (level != Level.NONE) level = Level.CODEPOINT;
}
/**
* Change the current level to LOWERCASE as inferred
* by other features' needs. If the current level
* was user specified it will not change; also this
* will not increase the level.
*/
public void inferLowercase() {
if (userSpecified) {
// ignore inferred changes if user specified something
return;
}
// do not increase level
if (level == Level.NONE) return;
if (level == Level.CODEPOINT) return;
level = Level.LOWERCASE;
}
public Level getLevel() {
return level;
}
}
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