/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.btree.keys;
import java.text.Collator;
import java.util.Locale;
/**
* Implementation that uses the JDK library (does not support compressed sort
* keys).
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
class JDKSortKeyGenerator implements UnicodeSortKeyGenerator {
private final Collator collator;
/**
* The {@link Locale} used to configure this object.
*/
private final Locale locale;
/**
* The {@link Locale} used to configure this object.
*/
public Locale getLocale() {
return locale;
}
public JDKSortKeyGenerator(final Locale locale, final Object strength,
final DecompositionEnum mode) {
if (locale == null)
throw new IllegalArgumentException();
this.locale = locale;
this.collator = Collator.getInstance(locale);
if (strength != null) {
if (strength instanceof Integer) {
collator.setStrength(((Integer) strength).intValue());
} else {
StrengthEnum str = (StrengthEnum) strength;
switch (str) {
case Primary:
collator.setStrength(Collator.PRIMARY);
break;
case Secondary:
collator.setStrength(Collator.SECONDARY);
break;
case Tertiary:
collator.setStrength(Collator.TERTIARY);
break;
// case Quaternary:
// collator.setStrength(Collator.QUATERNARY);
// break;
case Identical:
collator.setStrength(Collator.IDENTICAL);
break;
default:
throw new UnsupportedOperationException("strength="
+ strength);
}
}
}
if (mode != null) {
switch (mode) {
case None:
collator.setDecomposition(Collator.NO_DECOMPOSITION);
break;
case Full:
collator.setDecomposition(Collator.FULL_DECOMPOSITION);
break;
case Canonical:
collator.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
break;
default:
throw new UnsupportedOperationException("mode=" + mode);
}
}
}
public void appendSortKey(KeyBuilder keyBuilder, String s) {
/*
* Note: the collation key is expressed as signed bytes since that
* is how the JDK normally compares byte[]s. Therefore append it
* into the key builder using the API that translates signed bytes
* to unsigned bytes.
*/
final byte[] sortKey = collator.getCollationKey(s).toByteArray();
keyBuilder.append( sortKey );
}
}