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src/main/java/eu/greyson/JavaTestRefactor/Validate.java

+package eu.greyson.JavaTestRefactor;
+
+import org.apache.commons.lang3.StringUtils;
+
+import java.math.BigDecimal;
+
+public class Validate {
+
+	public static final String QUIT = "quit";
+	public static final String VALIDATION_EXIT = "Exiting application.";
+	public static final String VALIDATION_INVALID_INPUT = "Invalid input: ";
+	public static final String VALIDATION_3_LETTERS = "Invalid input. Currency must be 3 letters !";
+	public static final String VALIDATION_AMOUNT_NUMBER = "Invalid input. Amount must consit of only numbers!";
+
+	/***
+	 * Input validation for the file or keyboard input
+	 *
+	 * @param input String representations of payment or other text (like the "quit" abort keyword)
+	 * @return <b>true</b> only if the payment string representation has a 3 letter currency and a number amount
+	 * <p><b>false</b> if invalid payment or aborting application using the "quit" string
+	 */
+	public boolean isValidInputFormat(String input) {
+
+		if (QUIT.equals(input)) {
+			System.out.println(VALIDATION_EXIT);
+			return false;
+		}
+
+		if (StringUtils.isBlank(input)) {
+			return false;
+		}
+
+		String[] paymentSplit = input.trim().split(" ");
+
+		if (paymentSplit.length != 2) {
+			System.out.println(VALIDATION_INVALID_INPUT + input);
+			return false;
+		}
+
+		if (paymentSplit[0].length() != 3) {
+			System.out.println(VALIDATION_3_LETTERS);
+			return false;
+		}
+
+		try {
+			new BigDecimal(paymentSplit[1]);
+		} catch (NumberFormatException nfe) {
+			System.out.println(VALIDATION_AMOUNT_NUMBER);
+			return false;
+		}
+
+		return true;
+	}
+}
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