Merge pull request #39 from cryptomator/feature/display-name

Feature: Add interface for display name

src/main/java/org/cryptomator/integrations/common/DisplayName.java

@@ -0,0 +1,25 @@
+package org.cryptomator.integrations.common;
+
+import org.jetbrains.annotations.ApiStatus;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A humanreadable name of the annotated class.
+ * <p>
+ * Checked in the default implementation of the {@link NamedServiceProvider#getName()} with lower priority.
+ *
+ * @see NamedServiceProvider
+ * @see LocalizedDisplayName
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+@ApiStatus.Experimental
+public @interface DisplayName {
+	String value();
+}

src/main/java/org/cryptomator/integrations/common/LocalizedDisplayName.java

@@ -0,0 +1,39 @@
+package org.cryptomator.integrations.common;
+
+import org.jetbrains.annotations.ApiStatus;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A humanreadable, localized name of the annotated class.
+ * <p>
+ * Checked in the default implementation of the {@link NamedServiceProvider#getName()} with highest priority.
+ *
+ * @see NamedServiceProvider
+ * @see DisplayName
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+@ApiStatus.Experimental
+public @interface LocalizedDisplayName {
+
+	/**
+	 * Name of the localization bundle, where the display name is loaded from.
+	 *
+	 * @return Name of the localization bundle
+	 */
+	String bundle();
+
+	/**
+	 * The localization key containing the display name.
+	 *
+	 * @return Localization key to use
+	 */
+	String key();
+
+}

src/main/java/org/cryptomator/integrations/common/NamedServiceProvider.java

@@ -0,0 +1,41 @@
+package org.cryptomator.integrations.common;
+
+import org.slf4j.LoggerFactory;
+
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
+
+/**
+ * A service provider with a human-readable, possibly localized name.
+ */
+public interface NamedServiceProvider {
+
+	/**
+	 * Get the name of this service provider.
+	 *
+	 * @return The name of the service provider
+	 * @implNote The default implementation looks first for a {@link LocalizedDisplayName} and loads the name from the specified resource bundle/key. If the annotation is not present or loading the resource throws an exception, the code looks for {@link DisplayName} and uses its value. If none of the former annotations are present, it falls back to the qualified class name.
+	 * @see DisplayName
+	 * @see LocalizedDisplayName
+	 */
+	default String getName() {
+		var localizedDisplayName = this.getClass().getAnnotation(LocalizedDisplayName.class);
+		if (localizedDisplayName != null) {
+			try {
+				return ResourceBundle.getBundle(localizedDisplayName.bundle()) //
+						.getString(localizedDisplayName.key());
+			} catch (MissingResourceException e) {
+				var clazz = this.getClass();
+				var logger = LoggerFactory.getLogger(clazz);
+				logger.warn("Failed to load localized display name for {}. Falling back to not-localized display name/class name.", clazz.getName(), e);
+			}
+		}
+
+		var displayName = this.getClass().getAnnotation(DisplayName.class);
+		if (displayName != null) {
+			return displayName.value();
+		} else {
+			return this.getClass().getName();
+		}
+	}
+}