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Merge pull request #15630 from thibaultfaure/articles/BAEL-7356-Morse-Code 

BAEL-7356 Code for the Morse Code Translation in Java article
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davidmartinezbarua 2024-01-18 19:50:44 -03:00 committed by GitHub
parent 4204652a27 fc231c59ff
commit b38e72cd5a
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6
core-java-modules/core-java-string-operations-7/pom.xml
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@ -39,6 +39,11 @@
<artifactId>icu4j</artifactId>
<version>${icu4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${apache.commons.collection.version}</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
@ -75,6 +80,7 @@
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<apache.commons.lang3.version>3.13.0</apache.commons.lang3.version>
<apache.commons.collection.version>4.4</apache.commons.collection.version>
<apache.tika.version>2.9.1</apache.tika.version>
<commons-text.version>1.10.0</commons-text.version>
<icu4j.version>74.1</icu4j.version>

103
core-java-modules/core-java-string-operations-7/src/main/java/com/baeldung/morse/MorseTranslator.java Normal file
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@ -0,0 +1,103 @@
package com.baeldung.morse;
import org.apache.commons.collections4.BidiMap;
import org.apache.commons.collections4.bidimap.DualHashBidiMap;
public class MorseTranslator {
private static final BidiMap<String, String> morseAlphabet = new DualHashBidiMap<>();
static {
morseAlphabet.put("A", ".-");
morseAlphabet.put("B", "-...");
morseAlphabet.put("C", "-.-.");
morseAlphabet.put("D", "-..");
morseAlphabet.put("E", ".");
morseAlphabet.put("F", "..-.");
morseAlphabet.put("G", "--.");
morseAlphabet.put("H", "....");
morseAlphabet.put("I", "..");
morseAlphabet.put("J", ".---");
morseAlphabet.put("K", "-.-");
morseAlphabet.put("L", ".-..");
morseAlphabet.put("M", "--");
morseAlphabet.put("N", "-.");
morseAlphabet.put("O", "---");
morseAlphabet.put("P", ".--.");
morseAlphabet.put("Q", "--.-");
morseAlphabet.put("R", ".-.");
morseAlphabet.put("S", "...");
morseAlphabet.put("T", "-");
morseAlphabet.put("U", "..-");
morseAlphabet.put("V", "...-");
morseAlphabet.put("W", ".--");
morseAlphabet.put("X", "-..-");
morseAlphabet.put("Y", "-.--");
morseAlphabet.put("Z", "--..");
morseAlphabet.put("0", "-----");
morseAlphabet.put("1", ".----");
morseAlphabet.put("2", "..---");
morseAlphabet.put("3", "...--");
morseAlphabet.put("4", "....-");
morseAlphabet.put("5", ".....");
morseAlphabet.put("6", "-....");
morseAlphabet.put("7", "--...");
morseAlphabet.put("8", "---..");
morseAlphabet.put("9", "----.");
morseAlphabet.put(".", ".-.-.-");
morseAlphabet.put(",", "--..--");
morseAlphabet.put("?", "..--..");
morseAlphabet.put("'", ".----.");
morseAlphabet.put("!", "-.-.-----.");
morseAlphabet.put("/", "-..-.");
morseAlphabet.put("(", "-.--.");
morseAlphabet.put(")", "-.--.-");
morseAlphabet.put("&", ".-...");
morseAlphabet.put(":", "---...");
morseAlphabet.put(";", "-.-.-.");
morseAlphabet.put("=", "-...-");
morseAlphabet.put("+", ".-.-.");
morseAlphabet.put("-", "-....-");
morseAlphabet.put("_", "..--.-");
morseAlphabet.put("\"", ".-..-.");
morseAlphabet.put("$", "...-..-");
morseAlphabet.put("@", ".--.-.");
morseAlphabet.put(" ", "/");
}
static String englishToMorse(String english) {
if (english == null) {
return null;
}
String upperCaseEnglish = english.toUpperCase();
String[] morse = new String[upperCaseEnglish.length()];
for (int index = 0; index < upperCaseEnglish.length(); index++) {
String morseCharacter = morseAlphabet.get(String.valueOf(upperCaseEnglish.charAt(index)));
if (morseCharacter == null) {
throw new IllegalArgumentException("Character " + upperCaseEnglish.charAt(index) + " can't be translated to morse");
}
morse[index] = morseCharacter;
}
return String.join(" ", morse);
}
static String morseToEnglish(String morse) {
if (morse == null) {
return null;
}
if (morse.isEmpty()) {
return "";
}
String[] morseUnitCharacters = morse.split(" ");
StringBuilder stringBuilder = new StringBuilder();
for (int index = 0; index < morseUnitCharacters.length; index ++) {
String englishCharacter = morseAlphabet.getKey(morseUnitCharacters[index]);
if (englishCharacter == null) {
throw new IllegalArgumentException("Character " + morseUnitCharacters[index] + " is not a valid morse character");
}
stringBuilder.append(englishCharacter);
}
return stringBuilder.toString();
}
}

55
core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/morse/MorseTranslatorUnitTest.java Normal file
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@ -0,0 +1,55 @@
package com.baeldung.morse;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
public class MorseTranslatorUnitTest {
@ParameterizedTest
@ValueSource(strings = {"MORSE CODE!", "morse code!", "mOrSe cOdE!"})
void givenAValidEnglishWordWhateverTheCapitalization_whenEnglishToMorse_thenTranslatedToMorse(String english) {
assertEquals("-- --- .-. ... . / -.-. --- -.. . -.-.-----.", MorseTranslator.englishToMorse(english));
}
@Test
void givenAnEnglishWordWithAnIllegalCharacter_whenEnglishToMorse_thenThrows() {
String english = "~This sentence starts with an illegal character";
assertThrows(IllegalArgumentException.class, () -> MorseTranslator.englishToMorse(english));
}
@Test
void givenNull_whenEnglishToMorse_thenNull() {
assertNull(MorseTranslator.englishToMorse(null));
}
@Test
void givenEmptyString_whenEnglishToMorse_thenEmptyArray() {
assertEquals("", MorseTranslator.englishToMorse(""));
}
@Test
void givenAValidMorseWord_whenMorseToEnglish_thenTranslatedToUpperCaseEnglish() {
assertEquals("MORSE CODE!", MorseTranslator.morseToEnglish("-- --- .-. ... . / -.-. --- -.. . -.-.-----."));
}
@Test
void givenAMorseWordWithAnIllegalCharacter_whenMorseToEnglish_thenThrows() {
assertThrows(IllegalArgumentException.class, () -> MorseTranslator.morseToEnglish(".!!!!!!!"));
}
@Test
void givenNull_whenMorseToEnglish_thenNull() {
assertNull(MorseTranslator.morseToEnglish(null));
}
@Test
void givenEmptyArray_whenMorseToEnglish_thenEmptyString() {
assertEquals("", MorseTranslator.morseToEnglish(""));
}
}