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18 package org.apache.commons.codec.language.bm;
19
20 import java.io.InputStream;
21 import java.util.Collections;
22 import java.util.EnumMap;
23 import java.util.HashSet;
24 import java.util.Map;
25 import java.util.NoSuchElementException;
26 import java.util.Scanner;
27 import java.util.Set;
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53 public class Languages {
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60
61 public static abstract class LanguageSet {
62
63 public static LanguageSet from(final Set<String> langs) {
64 return langs.isEmpty() ? NO_LANGUAGES : new SomeLanguages(langs);
65 }
66
67 public abstract boolean contains(String language);
68
69 public abstract String getAny();
70
71 public abstract boolean isEmpty();
72
73 public abstract boolean isSingleton();
74
75 public abstract LanguageSet restrictTo(LanguageSet other);
76 }
77
78
79
80
81 public static final class SomeLanguages extends LanguageSet {
82 private final Set<String> languages;
83
84 private SomeLanguages(final Set<String> languages) {
85 this.languages = Collections.unmodifiableSet(languages);
86 }
87
88 @Override
89 public boolean contains(final String language) {
90 return this.languages.contains(language);
91 }
92
93 @Override
94 public String getAny() {
95 return this.languages.iterator().next();
96 }
97
98 public Set<String> getLanguages() {
99 return this.languages;
100 }
101
102 @Override
103 public boolean isEmpty() {
104 return this.languages.isEmpty();
105 }
106
107 @Override
108 public boolean isSingleton() {
109 return this.languages.size() == 1;
110 }
111
112 @Override
113 public LanguageSet restrictTo(final LanguageSet other) {
114 if (other == NO_LANGUAGES) {
115 return other;
116 } else if (other == ANY_LANGUAGE) {
117 return this;
118 } else {
119 final SomeLanguages sl = (SomeLanguages) other;
120 if (sl.languages.containsAll(languages)) {
121 return this;
122 } else {
123 final Set<String> ls = new HashSet<String>(this.languages);
124 ls.retainAll(sl.languages);
125 return from(ls);
126 }
127 }
128 }
129
130 @Override
131 public String toString() {
132 return "Languages(" + languages.toString() + ")";
133 }
134
135 }
136
137 public static final String ANY = "any";
138
139 private static final Map<NameType, Languages> LANGUAGES = new EnumMap<NameType, Languages>(NameType.class);
140
141 static {
142 for (final NameType s : NameType.values()) {
143 LANGUAGES.put(s, getInstance(langResourceName(s)));
144 }
145 }
146
147 public static Languages getInstance(final NameType nameType) {
148 return LANGUAGES.get(nameType);
149 }
150
151 public static Languages getInstance(final String languagesResourceName) {
152
153 final Set<String> ls = new HashSet<String>();
154 final InputStream langIS = Languages.class.getClassLoader().getResourceAsStream(languagesResourceName);
155
156 if (langIS == null) {
157 throw new IllegalArgumentException("Unable to resolve required resource: " + languagesResourceName);
158 }
159
160 final Scanner lsScanner = new Scanner(langIS, ResourceConstants.ENCODING);
161 boolean inExtendedComment = false;
162 while (lsScanner.hasNextLine()) {
163 final String line = lsScanner.nextLine().trim();
164 if (inExtendedComment) {
165 if (line.endsWith(ResourceConstants.EXT_CMT_END)) {
166 inExtendedComment = false;
167 }
168 } else {
169 if (line.startsWith(ResourceConstants.EXT_CMT_START)) {
170 inExtendedComment = true;
171 } else if (line.length() > 0) {
172 ls.add(line);
173 }
174 }
175 }
176
177 return new Languages(Collections.unmodifiableSet(ls));
178 }
179
180 private static String langResourceName(final NameType nameType) {
181 return String.format("org/apache/commons/codec/language/bm/%s_languages.txt", nameType.getName());
182 }
183
184 private final Set<String> languages;
185
186
187
188
189 public static final LanguageSet NO_LANGUAGES = new LanguageSet() {
190 @Override
191 public boolean contains(final String language) {
192 return false;
193 }
194
195 @Override
196 public String getAny() {
197 throw new NoSuchElementException("Can't fetch any language from the empty language set.");
198 }
199
200 @Override
201 public boolean isEmpty() {
202 return true;
203 }
204
205 @Override
206 public boolean isSingleton() {
207 return false;
208 }
209
210 @Override
211 public LanguageSet restrictTo(final LanguageSet other) {
212 return this;
213 }
214
215 @Override
216 public String toString() {
217 return "NO_LANGUAGES";
218 }
219 };
220
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224 public static final LanguageSet ANY_LANGUAGE = new LanguageSet() {
225 @Override
226 public boolean contains(final String language) {
227 return true;
228 }
229
230 @Override
231 public String getAny() {
232 throw new NoSuchElementException("Can't fetch any language from the any language set.");
233 }
234
235 @Override
236 public boolean isEmpty() {
237 return false;
238 }
239
240 @Override
241 public boolean isSingleton() {
242 return false;
243 }
244
245 @Override
246 public LanguageSet restrictTo(final LanguageSet other) {
247 return other;
248 }
249
250 @Override
251 public String toString() {
252 return "ANY_LANGUAGE";
253 }
254 };
255
256 private Languages(final Set<String> languages) {
257 this.languages = languages;
258 }
259
260 public Set<String> getLanguages() {
261 return this.languages;
262 }
263 }