skrueger/i8n/I8NUtil.java

/*******************************************************************************
 * Copyright (c) 2009 Martin O. J. Schmitz.
 * 
 * This file is part of the SCHMITZM library - a collection of utility 
 * classes based on Java 1.6, focusing (not only) on Java Swing 
 * and the Geotools library.
 * 
 * The SCHMITZM project is hosted at:
 * http://wald.intevation.org/projects/schmitzm/
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License (license.txt)
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * or try this link: http://www.gnu.org/licenses/lgpl.html
 * 
 * Contributors:
 *     Martin O. J. Schmitz - initial API and implementation
 *     Stefan A. Krüger - additional utility classes
 ******************************************************************************/
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);
                // }
        }

        /**
         * Creates a {@link Translation}<br/>
         * <p>
         * <li>If <code>oneLineCoded</code> is empty or null, NO TRANSLATION is set.
         * <li>If format can't be recognized, the {@link String} is interpreted as
         * the translation in the <code>{@value #DEFAULT_KEY}</code> language
         * 
         * @author Stefan Alfons Krüger
         */
        public static Translation createFromOneLIne(final String oneLineCoded) {
                Translation result = new Translation();
                result.fromOneLine(oneLineCoded);
                return result;
        }

        /**
         * Returns the Translation to a String of the Format: "de{Baum}en{tree}" <br/>
         * 
         * 
         * @author Stefan Alfons Krüger
         */
        public static String toOneLine(Translation source) {
                StringBuffer oneLine = new StringBuffer();
                for (String key : source.keySet()) {
                        oneLine.append(key + "{" + source.get(key) + "}");
                }
                return oneLine.toString();
        }

        /**
         * @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	/*******************************************************************************
2	* Copyright (c) 2009 Martin O. J. Schmitz.
3	*
4	* This file is part of the SCHMITZM library - a collection of utility
5	* classes based on Java 1.6, focusing (not only) on Java Swing
6	* and the Geotools library.
7	*
8	* The SCHMITZM project is hosted at:
9	* http://wald.intevation.org/projects/schmitzm/
10	*
11	* This program is free software; you can redistribute it and/or
12	* modify it under the terms of the GNU Lesser General Public License
13	* as published by the Free Software Foundation; either version 3
14	* of the License, or (at your option) any later version.
15	*
16	* This program is distributed in the hope that it will be useful,
17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19	* GNU General Public License for more details.
20	*
21	* You should have received a copy of the GNU Lesser General Public License (license.txt)
22	* along with this program; if not, write to the Free Software
23	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24	* or try this link: http://www.gnu.org/licenses/lgpl.html
25	*
26	* Contributors:
27	* Martin O. J. Schmitz - initial API and implementation
28	* Stefan A. Krüger - additional utility classes
29	******************************************************************************/
30	package skrueger.i8n;
31
32	import java.util.Locale;
33	import java.util.Set;
34	import java.util.TreeSet;
35
36	import org.apache.log4j.Logger;
37
38	public class I8NUtil {
39	static final Logger LOGGER = Logger.getLogger(I8NUtil.class);
40
41	private static Set<String> languageCodes = new TreeSet<String>();
42	static {
43	for (Locale locale : java.util.Locale.getAvailableLocales()) {
44	getLanguageCodes().add(locale.getLanguage());
45	}
46	// for (String code : java.util.Locale.getISOLanguages()) {
47	// getLanguageCodes().add(code);
48	// }
49	}
50
51	/**
52	* Creates a {@link Translation}<br/>
53	* <p>
54	* <li>If <code>oneLineCoded</code> is empty or null, NO TRANSLATION is set.
55	* <li>If format can't be recognized, the {@link String} is interpreted as
56	* the translation in the <code>{@value #DEFAULT_KEY}</code> language
57	*
58	* @author Stefan Alfons Krüger
59	*/
60	public static Translation createFromOneLIne(final String oneLineCoded) {
61	Translation result = new Translation();
62	result.fromOneLine(oneLineCoded);
63	return result;
64	}
65
66	/**
67	* Returns the Translation to a String of the Format: "de{Baum}en{tree}" <br/>
68	*
69	*
70	* @author Stefan Alfons Krüger
71	*/
72	public static String toOneLine(Translation source) {
73	StringBuffer oneLine = new StringBuffer();
74	for (String key : source.keySet()) {
75	oneLine.append(key + "{" + source.get(key) + "}");
76	}
77	return oneLine.toString();
78	}
79
80	/**
81	* @author Stefan Alfons Krüger
82	* @param code
83	* @return true if the code paramter is a valid ISO Language code
84	*/
85	public static boolean isValidISOLangCode(String code) {
86	return getLanguageCodes().contains(code);
87	}
88
89	/**
90	* @return All language codes available in
91	* java.util.Locale.getISOLanguages() without duplicates.
92	*/
93	public static Set<String> getLanguageCodes() {
94	return languageCodes;
95	}
96
97	/**
98	* @param code
99	* A two-letter language code.
100	* @return <code>null</code> or one (of many possible) {@link Locale} that
101	* uses this language.
102	*/
103	public static Locale getLocaleFor(String code) {
104	for (Locale l : Locale.getAvailableLocales()) {
105	if (l.getLanguage().equals(code.toLowerCase())) {
106	return l;
107	}
108	// LOGGER.debug(l.getLanguage() + " not = " + code);
109	}
110
111	LOGGER.error("Can't create a Locale for code " + code
112	+ "! Returning the system default locale to avoid NPEs.");
113
114	return Locale.getDefault();
115	}
116
117	/**
118	* A convenience method that checks if the {@link Translation} object
119	* contains a translation for the active language. A {@link String}
120	* containing only spaces will return <code>false</code>.
121	*
122	* @param trans
123	* {@link Translation} to check.
124	*/
125	public static boolean isEmpty(final Translation trans) {
126	if (trans == null)
127	return true;
128	return isEmpty(trans.toString());
129	}
130
131	/**
132	* A convenience method that checks if the {@link String} returned by from a
133	* {@link Translation} object contains a "valid" translation for the active
134	* language. A {@link String} containing only spaces or equals
135	* {@link Translation}.NO_TRANSLATION will return <code>false</code>.
136	*
137	* @param transString
138	* {@link String} to check.
139	*/
140	public static boolean isEmpty(final String transString) {
141	if (transString == null)
142	return true;
143	if (transString.trim().isEmpty())
144	return true;
145	if (transString.equals(Translation.NO_TRANSLATION))
146	return true;
147	return false;
148	}
149	}