edu.cornell.mannlib.vitro.webapp.i18n.selection.LocaleSelectorUtilities.java Source code

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Here is the source code for edu.cornell.mannlib.vitro.webapp.i18n.selection.LocaleSelectorUtilities.java

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/* $This file is distributed under the terms of the license in /doc/license.txt$ */

package edu.cornell.mannlib.vitro.webapp.i18n.selection;

import java.io.FileNotFoundException;
import java.util.Locale;
import java.util.Set;

import javax.servlet.ServletContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.cornell.mannlib.vitro.webapp.controller.VitroRequest;

/**
 * Some static methods for the GUI aspects of selecting a Locale.
 */
public class LocaleSelectorUtilities {
    private static final Log log = LogFactory.getLog(LocaleSelectorUtilities.class);

    /**
     * Look in the current theme directory to find a selection image for this
     * Locale.
     * 
     * Images are expected at a resource path like
     * /[themeDir]/i18n/images/select_locale_[locale_code].*
     * 
     * For example, /themes/wilma/i18n/images/select_locale_en.png
     * /themes/wilma/i18n/images/select_locale_en.JPEG
     * /themes/wilma/i18n/images/select_locale_en.gif
     * 
     * To create a proper URL, prepend the context path.
     */
    public static String getImageUrl(VitroRequest vreq, Locale locale) throws FileNotFoundException {
        String filename = "select_locale_" + locale + ".";

        String themeDir = vreq.getAppBean().getThemeDir();
        String imageDirPath = "/" + themeDir + "i18n/images/";

        ServletContext ctx = vreq.getSession().getServletContext();
        @SuppressWarnings("unchecked")
        Set<String> resourcePaths = ctx.getResourcePaths(imageDirPath);
        if (resourcePaths != null) {
            for (String resourcePath : resourcePaths) {
                if (resourcePath.contains(filename)) {
                    String fullPath = vreq.getContextPath() + resourcePath;
                    log.debug("Found image for " + locale + " at '" + fullPath + "'");
                    return fullPath;
                }
            }
        }
        throw new FileNotFoundException("Can't find an image for " + locale);
    }
}