skrueger/i8n/I8NUtil.java

package skrueger.i8n;

import java.util.Locale;
import java.util.Set;
import java.util.TreeSet;

import org.apache.log4j.Logger;

public class I8NUtil {
        static final Logger LOGGER = Logger.getLogger(I8NUtil.class);

        private static Set<String> languageCodes = new TreeSet<String>();
        static {
                for (Locale locale : java.util.Locale.getAvailableLocales()) {
                        getLanguageCodes().add(locale.getLanguage());
                }
                // for (String code : java.util.Locale.getISOLanguages()) {
                // getLanguageCodes().add(code);
                // }
        }

        /**
         * @author Stefan Alfons Krüger
         * @param code
         * @return true if the code paramter is a valid ISO Language code
         */
        public static boolean isValidISOLangCode(String code) {
                return getLanguageCodes().contains(code);
        }

        /**
         * @return All language codes available in
         *         java.util.Locale.getISOLanguages() without duplicates.
         */
        public static Set<String> getLanguageCodes() {
                return languageCodes;
        }

        /**
         * @param code
         *            A two-letter language code.
         * @return <code>null</code> or one (of many possible) {@link Locale} that
         *         uses this language.
         */
        public static Locale getLocaleFor(String code) {
                for (Locale l : Locale.getAvailableLocales()) {
                        if (l.getLanguage().equals(code.toLowerCase())) {
                                return l;
                        }
                        LOGGER.debug(l.getLanguage() + " not = " + code);
                }

                LOGGER.error("Can't create a Locale for code " + code
                                + "! Returning the system default locale to avoid NPEs.");

                return Locale.getDefault();
        }

        /**
         * A convenience method that checks if the {@link Translation} object
         * contains a translation for the active language. A {@link String}
         * containing only spaces will return <code>false</code>.
         * 
         * @param trans
         *            {@link Translation} to check.
         */
        public static boolean isEmpty(final Translation trans) {
                if (trans == null)
                        return true;
                return isEmpty(trans.toString());
        }

        /**
         * A convenience method that checks if the {@link String} returned by from a
         * {@link Translation} object contains a "valid" translation for the active
         * language. A {@link String} containing only spaces or equals
         * {@link Translation}.NO_TRANSLATION will return <code>false</code>.
         * 
         * @param transString
         *            {@link String} to check.
         */
        public static boolean isEmpty(final String transString) {
                if (transString == null)
                        return true;
                if (transString.trim().isEmpty())
                        return true;
                if (transString.equals(Translation.NO_TRANSLATION))
                        return true;
                return false;
        }
}
1	mojays	2	package skrueger.i8n;
2
3	alfonx	39	import java.util.Locale;
4	alfonx	38	import java.util.Set;
5			import java.util.TreeSet;
6	mojays	2
7	alfonx	43	import org.apache.log4j.Logger;
8
9	mojays	2	public class I8NUtil {
10	alfonx	43	static final Logger LOGGER = Logger.getLogger(I8NUtil.class);
11	alfonx	39
12	alfonx	38	private static Set<String> languageCodes = new TreeSet<String>();
13	mojays	2	static {
14	alfonx	39	for (Locale locale : java.util.Locale.getAvailableLocales()) {
15			getLanguageCodes().add(locale.getLanguage());
16			}
17			// for (String code : java.util.Locale.getISOLanguages()) {
18			// getLanguageCodes().add(code);
19			// }
20			}
21
22	mojays	2	/**
23			* @author Stefan Alfons Krüger
24			* @param code
25			* @return true if the code paramter is a valid ISO Language code
26			*/
27			public static boolean isValidISOLangCode(String code) {
28	alfonx	38	return getLanguageCodes().contains(code);
29	mojays	2	}
30	alfonx	38
31			/**
32	alfonx	39	* @return All language codes available in
33			* java.util.Locale.getISOLanguages() without duplicates.
34	alfonx	38	*/
35			public static Set<String> getLanguageCodes() {
36			return languageCodes;
37			}
38	alfonx	39
39			/**
40			* @param code
41			* A two-letter language code.
42			* @return <code>null</code> or one (of many possible) {@link Locale} that
43			* uses this language.
44			*/
45			public static Locale getLocaleFor(String code) {
46			for (Locale l : Locale.getAvailableLocales()) {
47	alfonx	140	if (l.getLanguage().equals(code.toLowerCase())) {
48	alfonx	39	return l;
49			}
50	alfonx	140	LOGGER.debug(l.getLanguage() + " not = " + code);
51	alfonx	39	}
52	alfonx	140
53	alfonx	44	LOGGER.error("Can't create a Locale for code " + code
54			+ "! Returning the system default locale to avoid NPEs.");
55	alfonx	140
56	alfonx	43	return Locale.getDefault();
57	alfonx	39	}
58	alfonx	44
59			/**
60			* A convenience method that checks if the {@link Translation} object
61			* contains a translation for the active language. A {@link String}
62			* containing only spaces will return <code>false</code>.
63			*
64			* @param trans
65			* {@link Translation} to check.
66			*/
67			public static boolean isEmpty(final Translation trans) {
68			if (trans == null)
69			return true;
70			return isEmpty(trans.toString());
71			}
72
73			/**
74			* A convenience method that checks if the {@link String} returned by from a
75			* {@link Translation} object contains a "valid" translation for the active
76			* language. A {@link String} containing only spaces or equals
77			* {@link Translation}.NO_TRANSLATION will return <code>false</code>.
78			*
79			* @param transString
80			* {@link String} to check.
81			*/
82			public static boolean isEmpty(final String transString) {
83			if (transString == null)
84			return true;
85			if (transString.trim().isEmpty())
86			return true;
87			if (transString.equals(Translation.NO_TRANSLATION))
88			return true;
89			return false;
90			}
91	mojays	2	}