[client] Add helper classes for i18n.

2 files changed, 104 insertions, 0 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/I18n.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/I18n.java
new file mode 100644
index 00000000..fe976b59
--- /dev/null
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/I18n.java
@@ -0,0 +1,50 @@
+package org.openslx.dozmod.gui.helper;
+
+import org.apache.log4j.Logger;
+
+import java.text.MessageFormat;
+import java.util.ResourceBundle;
+
+/**
+ * Helper enum for loading resource bundle files and getting values from them.
+ */
+public enum I18n {
+    ACTIVITY("activity"),
+    CONFIGURATOR("configurator"),
+    CONTROL("control"),
+    HELPER("helper"),
+    PAGE("page"),
+    PAGE_LAYOUT("page_layout"),
+    WINDOW("window"),
+    WINDOW_LAYOUT("window_layout"),
+    WIZARD("wizard");
+
+    /**
+     * Logger for this class
+     */
+    private final static Logger LOGGER = Logger.getLogger(I18n.class);
+
+    private final ResourceBundle resourceBundle;
+
+    I18n(String bundleFilename) {
+        String baseName = "i18n." + bundleFilename;
+        resourceBundle = ResourceBundle.getBundle(baseName, new UTF8Control());
+    }
+
+    /**
+     * Returns i18n value for a given key and format the output at the appropriate places for (a) given parameter(s).
+     * If no key is found, return the key.
+     * @param key to get value
+     * @param params to get formatted output
+     * @return value represented by key or key on error
+     */
+    public String getString(String key, Object... params) {
+        try {
+            String value = resourceBundle.getString(key);
+            return MessageFormat.format(value, params);
+        } catch (Exception e) {
+            LOGGER.error("Could not find a value for the given key: " + key);
+            return key;
+        }
+    }
+}
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diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/UTF8Control.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/UTF8Control.java
new file mode 100644
index 00000000..2f759323
--- /dev/null
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/UTF8Control.java
@@ -0,0 +1,54 @@
+package org.openslx.dozmod.gui.helper;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+
+/**
+ * Custom ResourceBundle.Control class to read properties files as UTF-8, where usually ISO-8859-1 is default.
+ */
+public class UTF8Control extends ResourceBundle.Control {
+
+    @Override
+    public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload)
+            throws IllegalAccessException, InstantiationException, IOException {
+        if (!format.equals("java.properties")) {
+            return super.newBundle(baseName, locale, format, loader, reload);
+        }
+
+        String bundleName = toBundleName(baseName, locale);
+        String resourceName = toResourceName(bundleName, "properties");
+
+        ResourceBundle bundle = null;
+        InputStream stream = null;
+
+        if (reload) {
+            URL url = loader.getResource(resourceName);
+            if (url != null) {
+                URLConnection connection = url.openConnection();
+                if (connection != null) {
+                    connection.setUseCaches(false);
+                    stream = connection.getInputStream();
+                }
+            }
+        } else {
+            stream = loader.getResourceAsStream(resourceName);
+        }
+
+        if (stream != null) {
+            try {
+                bundle = new PropertyResourceBundle(new InputStreamReader(stream, StandardCharsets.UTF_8));
+            } finally {
+                stream.close();
+            }
+        }
+
+        return bundle;
+    }
+}
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