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1
87
88 package org.opencms.i18n;
89
90 import org.opencms.main.CmsIllegalArgumentException;
91 import org.opencms.main.CmsRuntimeException;
92 import org.opencms.main.OpenCms;
93 import org.opencms.util.CmsStringUtil;
94
95 import java.util.ArrayList  ;
96 import java.util.Collections ;
97 import java.util.Iterator ;
98 import java.util.List ;
99 import java.util.Locale ;
100 import java.util.NoSuchElementException ;
101
102 import javax.servlet.http.HttpServletRequest ;
103
104
115 public class CmsAcceptLanguageHeaderParser implements Iterator {
116
117
120 class AcceptLanguage implements Comparable {
121
122
123 Locale m_locale;
124
125
126 Float m_quality = DEFAULT_QUALITY;
127
128
131 public final int compareTo(Object acceptLang) {
132
133 return m_quality.compareTo(((AcceptLanguage)acceptLang).m_quality);
134 }
135 }
136
137
138 public static final String ACCEPT_LANGUAGE = "Accept-Language";
139
140
141 protected static final Float DEFAULT_QUALITY = new Float (1.0f);
142
143
144 private static final char LOCALE_SEPARATOR = ',';
145
146
147 private static final char QUALITY_SEPARATOR = ';';
148
149
150 private List m_acceptLanguage = new ArrayList (3);
151
152
153 private List m_locales;
154
155
161 public CmsAcceptLanguageHeaderParser(HttpServletRequest req, Locale defaultLocale) {
162
163 this(req.getHeader(ACCEPT_LANGUAGE), defaultLocale);
164 }
165
166
172 public CmsAcceptLanguageHeaderParser(String header, Locale defaultLocale) {
173
174 if (header == null) {
177 m_locales = new ArrayList ();
178 m_locales.add(defaultLocale);
179 } else {
180 List tokens = CmsStringUtil.splitAsList(header, LOCALE_SEPARATOR, true);
181 Iterator it = tokens.iterator();
182 while (it.hasNext()) {
183 AcceptLanguage acceptLang = new AcceptLanguage();
184 String element = (String )it.next();
185 int index;
186
187 index = element.indexOf(QUALITY_SEPARATOR);
189 if (index != -1) {
190 String q = element.substring(index);
191 element = element.substring(0, index);
192 index = q.indexOf('=');
193 if (index != -1) {
194 try {
195 acceptLang.m_quality = Float.valueOf(q.substring(index + 1));
196 } catch (NumberFormatException useDefault) {
197 }
199 }
200 }
201
202 element = element.trim();
203
204 index = element.indexOf('-');
206 if (index == -1) {
207 acceptLang.m_locale = new Locale (element, "");
209 } else {
210 acceptLang.m_locale = new Locale (element.substring(0, index), element.substring(index + 1));
211 }
212
213 m_acceptLanguage.add(acceptLang);
214 }
215
216 Collections.sort(m_acceptLanguage, Collections.reverseOrder());
218
219 m_locales = new ArrayList (m_acceptLanguage.size());
221 Iterator i = m_acceptLanguage.iterator();
222 while (i.hasNext()) {
223 AcceptLanguage lang = (AcceptLanguage)i.next();
224 m_locales.add(lang.m_locale);
225 }
226 }
227
228 }
229
230
235 public static String createLanguageHeader() {
236
237 String header;
238
239 List defaultLocales = OpenCms.getLocaleManager().getDefaultLocales();
241 Iterator i = defaultLocales.iterator();
242 header = "";
243 while (i.hasNext()) {
244 Locale loc = (Locale )i.next();
245 header += loc.getLanguage() + ", ";
246 }
247 header = header.substring(0, header.length() - 2);
248 return header;
249 }
250
251
256 public List getAcceptedLocales() {
257
258 return m_locales;
259 }
260
261
264 public boolean hasNext() {
265
266 return !m_acceptLanguage.isEmpty();
267 }
268
269
274 public Object next() {
275
276 if (m_acceptLanguage.isEmpty()) {
277 throw new NoSuchElementException ();
278 }
279 return ((AcceptLanguage)m_acceptLanguage.remove(0)).m_locale;
280 }
281
282
288 public final void remove() throws CmsIllegalArgumentException {
289
290 throw new CmsRuntimeException(org.opencms.db.Messages.get().container(
291 org.opencms.db.Messages.ERR_UNSUPPORTED_OPERATION_2,
292 getClass().getName(),
293 "remove()"));
294 }
295 } |
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