/*
* 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.el.ValueBinding;
import javax.faces.model.SelectItem;
import org.apache.myfaces.component.html.ext.HtmlSelectOneMenu;
import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
/**
* @author Sylvain Vieujot (latest modification by $Author: cagatay $)
* @version $Revision: 499558 $ $Date: 2005-05-11 12:14:23 -0400 (Wed, 11 May 2005) $
*/
public class SelectOneLanguage 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 SelectOneLanguage() {
setRendererType(DEFAULT_RENDERER_TYPE);
}
public Integer getMaxLength() {
if (_maxLength != null) return _maxLength;
ValueBinding vb = getValueBinding("maxLength");
return vb != null ? (Integer)vb.getValue(getFacesContext()) : null;
}
public void setMaxLength(Integer maxLength) {
_maxLength = maxLength;
}
public String getEmptySelection() {
if (_emptySelection != null) return _emptySelection;
ValueBinding vb = getValueBinding("emptySelection");
return vb != null ? (String)vb.getValue(getFacesContext()) : null;
}
public void setEmptySelection(String emptySelection) {
_emptySelection = emptySelection;
}
public Object saveState(FacesContext context) {
Object values[] = new Object[3];
values[0] = super.saveState(context);
values[1] = _maxLength;
values[2] = _emptySelection;
return values;
}
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[])state;
super.restoreState(context, values[0]);
_maxLength = (Integer)values[1];
_emptySelection = (String) values[2];
}
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);
}
}