de.undercouch.citeproc.DefaultLocaleProvider Maven / Gradle / Ivy
package de.undercouch.citeproc;
import de.undercouch.citeproc.helper.CSLUtils;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
/**
* Default implementation of {@link LocaleProvider}. Loads locales from
* the classpath.
* @author Michel Kraemer
*/
public class DefaultLocaleProvider implements LocaleProvider {
/**
* A cache for the serialized XML of locales
*/
private final Map locales = new HashMap<>();
/**
* Retrieves the serialized XML for the given locale from the classpath.
* For example, if the locale is en-US this method loads
* the file /locales-en-US.xml from the classpath.
*/
@Override
public String retrieveLocale(String lang) {
String r = locales.get(lang);
if (r == null) {
try {
URL u = getClass().getResource("/locales-" + lang + ".xml");
if (u == null) {
throw new IllegalArgumentException("Unable to load locale " +
lang + ". Make sure you have a file called " +
"'/locales-" + lang + ".xml' at the root of your " +
"classpath. Did you add the CSL locale files to "
+ "your classpath?");
}
r = CSLUtils.readURLToString(u, "UTF-8");
} catch (IOException e) {
throw new RuntimeException(e);
}
locales.put(lang, r);
}
return r;
}
}