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/*
* libbrlapi - A library providing access to braille terminals for applications.
*
* Copyright (C) 2006-2025 by
* Samuel Thibault <Samuel.Thibault@ens-lyon.org>
* Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>
*
* libbrlapi comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
package org.a11y.brlapi;
import java.util.Set;
import java.util.Map;
import java.util.HashMap;
import java.util.LinkedHashMap;
public class KeywordMap<V> {
private final Map<String, V> valueMap = new LinkedHashMap<>();
private final Map<String, String> aliasMap = new HashMap<>();
private final static String AMBIGUOUS = "";
private static String normalizeKeyword (String keyword) {
return keyword.toLowerCase();
}
private final void addAliases (String keyword) {
String alias = keyword;
while (true) {
alias = alias.substring(0, alias.length()-1);
if (alias.isEmpty()) break;
String value = aliasMap.get(alias);
if (value == null) {
aliasMap.put(alias, keyword);
} else if (value == AMBIGUOUS) {
break;
} else {
aliasMap.put(alias, AMBIGUOUS);
}
}
}
public KeywordMap<V> put (String keyword, V value) {
keyword = normalizeKeyword(keyword);
valueMap.put(keyword, value);
addAliases(keyword);
return this;
}
public final V get (String keyword) {
keyword = normalizeKeyword(keyword);
V value = valueMap.get(keyword);
if (value != null) return value;
keyword = aliasMap.get(keyword);
if (keyword == null) return null;
if (keyword == AMBIGUOUS) return null;
return valueMap.get(keyword);
}
public final String[] getKeywords () {
Set<String> keywords = valueMap.keySet();
return keywords.toArray(new String[keywords.size()]);
}
public final boolean isEmpty () {
return valueMap.isEmpty();
}
public KeywordMap () {
}
}
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