/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/
package org.olat.modules.wiki;
import java.io.Serializable;
import java.text.Collator;
import java.util.Comparator;
import java.util.Locale;
import org.olat.core.util.i18n.I18nManager;
/**
* This comparator is intended to compare two wiki pages by their page name. The
* comparison is done with respect to the current locale. (The Serializable
* interface is recommended.)
* <P>
* Initial Date: Jun 12, 2009 <br>
*
* @author gwassmann
*/
public class WikiPageComparator implements Comparator<WikiPage>, Serializable {
/**
* Compares the name of page 'a' to that of page 'b' with respect to the
* current locale (different languages have different alphabets and hence
* different orders).
*
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(WikiPage a, WikiPage b) {
// Be aware of locale when ordering
I18nManager mgr = I18nManager.getInstance();
Locale userLocale = mgr.getCurrentThreadLocale();
Collator collator = Collator.getInstance(userLocale);
collator.setStrength(Collator.PRIMARY);
// Undefinied order if page a or b is null
int order = 0;
if (a != null && b != null) {
final String nameA = a.getPageName();
final String nameB = b.getPageName();
// Compare page names with the localized comparator
order = collator.compare(nameA, nameB);
}
return order;
}
}