[Java] TextBox入力検証

TextBoxValidateTest.java

public static boolean validateTextBox(String text, int limitBytes) {
  return !containsControl(text) && !isOverBytes(text, limitBytes);
}

public static boolean validateTextArea(String text, int limitBytes) {
  return !containsInvisible(text) && !isOverBytes(text, limitBytes);
}

private static boolean containsControl(String text) {
  return !text.matches("\\P{Cntrl}*");
}

private static boolean containsInvisible(String text) {
  return !text.matches("[\\P{Cntrl}\\p{Space}]*");
}

private static boolean isOverBytes(String text, int limit) {
  return countBytes(text) > limit;
}

private static final String CHAR_ENCODE = "UTF-8";

private static int countBytes(String text) {
  try {
    return text.getBytes(CHAR_ENCODE).length;
  } catch (UnsupportedEncodingException e) {
    throw new RuntimeException(e);
  }
}

@Test
public void testValidateTextBoxOK() {
  assertTrue(validateTextBox("ab cd", 5));
  assertTrue(validateTextBox("α", 2));
  assertTrue(validateTextBox("あ", 3));
  assertTrue(validateTextBox("𠀋", 4));
  assertTrue(validateTextBox("", 0));
}

@Test
public void testValidateTextBoxNgBytes() {
  assertFalse(validateTextBox("ab cd", 4));
  assertFalse(validateTextBox("α", 1));
  assertFalse(validateTextBox("あ", 2));
  assertFalse(validateTextBox("𠀋", 3));
}

@Test
public void testValidateTextBoxNgChar() {
  assertFalse(validateTextBox("\0", 5));
  assertFalse(validateTextBox("a\t", 5));
  assertFalse(validateTextBox("\rb", 5));
  assertFalse(validateTextBox("a\nb", 5));
}

@Test
public void testValidateTextAreaOK() {
  assertTrue(validateTextArea("\t", 1));
  assertTrue(validateTextArea("\r", 1));
  assertTrue(validateTextArea("\n", 1));
  assertTrue(validateTextArea("あ", 3));
  assertTrue(validateTextArea("aあ \t\n\f\r", 9));
  assertTrue(validateTextArea("", 0));
}

@Test
public void testValidateTextAreaNG() {
  assertFalse(validateTextArea("ab", 1));
  assertFalse(validateTextArea("\0", 1));
}