/*
* 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.wicket.core.util.resource.locator;
import java.util.Iterator;
import java.util.Locale;
import org.apache.wicket.util.string.Strings;
/**
* Given a Locale it'll iterate over all possible combinations of the attrs making up the Locale.
* Starting the Locale provided to more 'weaker' combinations. The latest one will be no Locale in
* which case an empty string will be returned.
*
* @author Juergen Donnerstag
*/
public class LocaleResourceNameIterator implements Iterator<String>
{
/** The locale (see Session) */
private final Locale locale;
/** Internal state */
private int state = 0;
private final boolean strict;
/**
* Construct.
*
* @param locale
* @param strict
*/
public LocaleResourceNameIterator(final Locale locale, boolean strict)
{
this.locale = locale;
this.strict = strict;
}
/**
* @return Locale
*/
public Locale getLocale()
{
if (state == 1)
{
// Language, country, variation
return locale;
}
else if (state == 2)
{
return new Locale(locale.getLanguage(), locale.getCountry());
}
else if (state == 3)
{
return new Locale(locale.getLanguage());
}
return null;
}
/**
*
* @see java.util.Iterator#hasNext()
*/
@Override
public boolean hasNext()
{
int limit = 4;
if (strict && locale != null)
{
// omit the last step
limit = 3;
}
return (state < limit);
}
/**
* @see java.util.Iterator#next()
*/
@Override
public String next()
{
if (locale == null)
{
state = 999;
return "";
}
// Get language and country, either of which may be the empty string
final String language = locale.getLanguage();
final String country = locale.getCountry();
final String variant = locale.getVariant();
// 1. If variant are available
if (state == 0)
{
state++;
if (!Strings.isEmpty(variant))
{
return '_' + language + '_' + country + '_' + variant;
}
}
// 2. If country available
if (state == 1)
{
state++;
if (!Strings.isEmpty(country))
{
return '_' + language + '_' + country;
}
}
// 4. If language is available
if (state == 2)
{
state++;
if (!Strings.isEmpty(language))
{
return '_' + language;
}
}
// 4. The path only; without locale
state++;
return "";
}
/**
*
* @see java.util.Iterator#remove()
*/
@Override
public void remove()
{
}
}