add I18n

src/main/java/ghast/I18n.java

@@ -0,0 +1,65 @@
+package ghast;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.experimental.UtilityClass;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.text.StringSubstitutor;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.HashMap;
+import java.util.Map;
+
+@UtilityClass
+@SuppressWarnings("unused")
+public class I18n {
+
+	private final Map<String, String> messagesMap = new HashMap<>();
+
+	@SuppressWarnings("java:S112")
+	public void loadMessages(Reader reader) {
+		try {
+			BufferedReader bufferedReader = new BufferedReader(reader);
+			String line;
+			while ((line = bufferedReader.readLine()) != null) {
+				String[] split = line.split("=", 2);
+				messagesMap.put(split[0].trim(), split[1].trim());
+			}
+		} catch (IOException e) {
+			throw new RuntimeException("Error load messages: " + e.getMessage(), e);
+		}
+	}
+
+	public void loadMessages(Map<String, String> messages) {
+		messagesMap.putAll(messages);
+	}
+
+	public String getMessage(String key) {
+		return messagesMap.getOrDefault(key, StringUtils.EMPTY);
+	}
+
+	public String getMessage(String key, Map<String, Object> params) {
+		return StringSubstitutor.replace(getMessage(key), params, "{", "}");
+	}
+
+	public ParamBuilder paramBuilder() {
+		return new ParamBuilder();
+	}
+
+	@NoArgsConstructor(access = AccessLevel.PRIVATE)
+	public static class ParamBuilder {
+
+		private final Map<String, Object> params = new HashMap<>();
+
+		public ParamBuilder add(String key, Object value) {
+			params.put(key, value);
+			return this;
+		}
+
+		public Map<String, Object> build() {
+			return params;
+		}
+	}
+}