| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed 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.tapestry.util; |
| |
| import java.util.Locale; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * Used in a wide variety of resource searches. Generates |
| * a series of name variations from a base name, a |
| * {@link java.util.Locale} and an optional suffix. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 3.0 |
| * |
| **/ |
| |
| public class LocalizedNameGenerator |
| { |
| private int _baseNameLength; |
| private String _suffix; |
| private StringBuffer _buffer; |
| private String _language; |
| private String _country; |
| private String _variant; |
| private int _state; |
| private int _prevState; |
| |
| private static final int INITIAL = 0; |
| private static final int LCV = 1; |
| private static final int LC = 2; |
| private static final int LV = 3; |
| private static final int L = 4; |
| private static final int BARE = 5; |
| private static final int EXHAUSTED = 6; |
| |
| public LocalizedNameGenerator(String baseName, Locale locale, String suffix) |
| { |
| _baseNameLength = baseName.length(); |
| |
| if (locale != null) |
| { |
| _language = locale.getLanguage(); |
| _country = locale.getCountry(); |
| _variant = locale.getVariant(); |
| } |
| |
| _state = INITIAL; |
| _prevState = INITIAL; |
| |
| _suffix = suffix; |
| |
| _buffer = new StringBuffer(baseName); |
| |
| advance(); |
| } |
| |
| private void advance() |
| { |
| _prevState = _state; |
| |
| while (_state != EXHAUSTED) |
| { |
| _state++; |
| |
| switch (_state) |
| { |
| case LCV : |
| |
| if (Tapestry.isBlank(_variant)) |
| continue; |
| |
| return; |
| |
| case LC : |
| |
| if (Tapestry.isBlank(_country)) |
| continue; |
| |
| return; |
| |
| case LV : |
| |
| // If _country is null, then we've already generated this string |
| // as state LCV and we can continue directly to state L |
| |
| if (Tapestry.isBlank(_variant) || Tapestry.isBlank(_country)) |
| continue; |
| |
| return; |
| |
| case L : |
| |
| if (Tapestry.isBlank(_language)) |
| continue; |
| |
| return; |
| |
| default : |
| return; |
| } |
| } |
| } |
| |
| /** |
| * Returns true if there are more name variants to be |
| * returned, false otherwise. |
| * |
| **/ |
| |
| public boolean more() |
| { |
| return _state != EXHAUSTED; |
| } |
| |
| /** |
| * Returns the next localized variant. |
| * |
| * @throws NoSuchElementException if all variants have been |
| * returned. |
| * |
| **/ |
| |
| public String next() |
| { |
| if (_state == EXHAUSTED) |
| throw new NoSuchElementException(); |
| |
| String result = build(); |
| |
| advance(); |
| |
| return result; |
| } |
| |
| private String build() |
| { |
| _buffer.setLength(_baseNameLength); |
| |
| if (_state == LC || _state == LCV || _state == L) |
| { |
| _buffer.append('_'); |
| _buffer.append(_language); |
| } |
| |
| // For LV, we want two underscores between language |
| // and variant. |
| |
| if (_state == LC || _state == LCV || _state == LV) |
| { |
| _buffer.append('_'); |
| |
| if (_state != LV) |
| _buffer.append(_country); |
| } |
| |
| if (_state == LV || _state == LCV) |
| { |
| _buffer.append('_'); |
| _buffer.append(_variant); |
| } |
| |
| if (_suffix != null) |
| _buffer.append(_suffix); |
| |
| return _buffer.toString(); |
| } |
| |
| public Locale getCurrentLocale() |
| { |
| switch (_prevState) |
| { |
| case LCV : |
| |
| return new Locale(_language, _country, _variant); |
| |
| case LC : |
| |
| return new Locale(_language, _country, ""); |
| |
| case LV : |
| |
| return new Locale(_language, "", _variant); |
| |
| case L : |
| |
| return new Locale(_language, "", ""); |
| |
| default : |
| return null; |
| } |
| } |
| } |