/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.custom.selectOneLanguage;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.TreeMap;
import javax.faces.component.UISelectItems;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;
import org.apache.myfaces.component.html.ext.HtmlSelectOneMenu;
import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
/**
* A localized list of languages choose box. The value binds to the
* language ISO 639 code (lowercase). This is the same code as
* for java.util.Locale.getLanguage(). The official codes
* list is available here :
*
* http://www.loc.gov/standards/iso639-2/englangn.html
*
* Unless otherwise specified, all attributes accept static values or EL expressions.
*
* @JSFComponent
* name = "t:selectOneLanguage"
* class = "org.apache.myfaces.custom.selectOneLanguage.SelectOneLanguage"
* tagClass = "org.apache.myfaces.custom.selectOneLanguage.SelectOneLanguageTag"
* @since 1.1.7
* @author Sylvain Vieujot (latest modification by $Author: lu4242 $)
* @version $Revision: 691856 $ $Date: 2008-09-04 02:40:30 +0000 (Thu, 04 Sep 2008) $
*/
public abstract class AbstractSelectOneLanguage extends HtmlSelectOneMenu {
public static final String COMPONENT_TYPE = "org.apache.myfaces.SelectOneLanguage";
private static final String DEFAULT_RENDERER_TYPE = "org.apache.myfaces.SelectOneLanguageRenderer";
private Integer _maxLength = null;
private String _emptySelection = null;
public AbstractSelectOneLanguage() {
setRendererType(DEFAULT_RENDERER_TYPE);
}
/**
* Integer equals to the maximum number of characters in the language name.
*
* @JSFProperty
*/
public abstract Integer getMaxLength();
/**
* Label and value to be used when displaying an empty selection
*
* @JSFProperty
*/
public abstract String getEmptySelection();
private Set getFilterSet(){
List selectItems = RendererUtils.getSelectItemList( this );
Set set = new HashSet( selectItems.size() );
for (Iterator i = selectItems.iterator(); i.hasNext(); )
set.add( ((SelectItem)i.next()).getValue().toString().toLowerCase() );
return set;
}
protected List getLanguagesChoicesAsSelectItemList(){
//return RendererUtils.getSelectItemList(component);
Set filterSet = getFilterSet();
String[] availableLanguages = Locale.getISOLanguages();
Locale currentLocale;
FacesContext facesContext = FacesContext.getCurrentInstance();
UIViewRoot viewRoot = facesContext.getViewRoot();
if( viewRoot != null )
currentLocale = viewRoot.getLocale();
else
currentLocale = facesContext.getApplication().getDefaultLocale();
TreeMap map = new TreeMap();
// TreeMap is sorted according to the keys' natural order
for(int i=0; i<availableLanguages.length; i++){
String languageCode = availableLanguages[i];
if( ! filterSet.isEmpty() && ! filterSet.contains(languageCode))
continue;
Locale tmp = new Locale(languageCode);
map.put(tmp.getDisplayLanguage(currentLocale), languageCode);
}
List languagesSelectItems = new ArrayList( map.size() );
if(getEmptySelection() != null)
languagesSelectItems.add(new SelectItem("", getEmptySelection()));
Integer maxLength = getMaxLength();
int maxDescriptionLength = maxLength==null ? Integer.MAX_VALUE : maxLength.intValue();
if( maxDescriptionLength < 5 )
maxDescriptionLength = 5;
for(Iterator i = map.keySet().iterator(); i.hasNext(); ){
String languageName = (String) i.next();
String languageCode = (String) map.get( languageName );
String label;
if( languageName.length() <= maxDescriptionLength )
label = languageName;
else
label = languageName.substring(0, maxDescriptionLength-3)+"...";
languagesSelectItems.add( new SelectItem(languageCode, label) );
}
return languagesSelectItems;
}
protected void validateValue(FacesContext context, Object value) {
UISelectItems selectItems = new UISelectItems();
selectItems.setTransient(true);
selectItems.setValue(getLanguagesChoicesAsSelectItemList());
getChildren().add(selectItems);
super.validateValue(context,value);
}
}