Basic I18n stuff

data/en.lang

@@ -0,0 +1,7 @@
+title=Totally Not Malware
+text.intro=H-hi there...
+text.question=Do you th-think I could have your credit card information, p-please
+label.card=Card number:
+label.date=Expiry date:
+label.code=Security code:
+button=Th-thanks

src/totallynotmalware/i18n/I18n.java

@@ -0,0 +1,27 @@
+package totallynotmalware.i18n;
+
+import java.io.IOException;
+
+public class I18n {
+	private static Language lang;
+	
+	public static void setLanguage(String lang) throws IOException {
+		if(I18n.lang==null || !I18n.lang.getCode().equals(lang)) {
+			I18n.lang=new Language(lang);
+		}
+	}
+	
+	public static String get(String name) {
+		if(I18n.lang==null) {
+			try {
+				I18n.setLanguage(I18n.defaultLang);
+			} catch (IOException e) {
+				throw new RuntimeException("Couldn't load language file", e);
+			}
+		}
+		
+		return I18n.lang.get(name);
+	}
+	
+	public static final String defaultLang="en";
+}

src/totallynotmalware/i18n/Language.java

@@ -0,0 +1,38 @@
+package totallynotmalware.i18n;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Language {
+	private Map<String, String> keys;
+	private String code;
+	
+	public Language(String code) throws IOException {
+		this.keys=new HashMap<String, String>();
+		this.code=code;
+		
+		// could be in these two places
+		InputStream in=this.getClass().getClassLoader().getResourceAsStream(code+".lang");
+		if(in==null) in=this.getClass().getClassLoader().getResourceAsStream("/data/"+code+".lang");
+		
+		// read the language file
+		BufferedReader reader=new BufferedReader(new InputStreamReader(in));
+		for(String line=reader.readLine(); line!=null; line=reader.readLine()) {
+			if(line.isEmpty()) continue;
+			String[] parts=line.split("=", 2);
+			this.keys.put(parts[0], parts[1]);
+		}
+		reader.close();
+	}
+	
+	public String get(String name) {
+		return this.keys.getOrDefault(name, name);
+	}
+	public String getCode() {
+		return this.code;
+	}
+}

test/totallynotmalware/TestI18n.java

@@ -0,0 +1,21 @@
+package totallynotmalware;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import totallynotmalware.i18n.I18n;
+
+class TestI18n {
+
+	@BeforeEach
+	void setUp() throws Exception {
+	}
+
+	@Test
+	void testDefaultLang() {
+		assertEquals(I18n.get("title"), "Totally Not Malware");
+	}
+
+}

test/totallynotmalware/TestLanguage.java

@@ -0,0 +1,30 @@
+package totallynotmalware;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import totallynotmalware.i18n.Language;
+
+class TestLanguage {
+	
+	Language en;
+	
+	@BeforeEach
+	void setUp() throws Exception {
+		en=new Language("en");
+	}
+
+	@Test
+	void testGet() {
+		assertEquals(en.get("title"), "Totally Not Malware");
+		assertEquals(en.get("button"), "Th-thanks");
+	}
+	
+	@Test
+	void testGetFallback() {
+		assertEquals(en.get("unknown.key"), "unknown.key");
+	}
+
+}