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BAEL-6591 Code for the Wrapping a String After a Number of Characters World-Wise in Java article

This commit is contained in:
Thibault Faure 2023-09-02 17:20:39 +02:00
parent 156793bb48
commit 0bf14c03f5
3 changed files with 96 additions and 0 deletions
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6
core-java-modules/core-java-string-algorithms-3/pom.xml
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@ -28,6 +28,11 @@
<artifactId>emoji-java</artifactId>
<version>${emoji-java.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>${apache-commons-text.version}</version>
</dependency>
</dependencies>
<build>
@ -58,6 +63,7 @@
<validator.version>1.7</validator.version>
<apache-commons-lang3.version>3.12.0</apache-commons-lang3.version>
<emoji-java.version>5.1.1</emoji-java.version>
<apache-commons-text.version>1.10.0</apache-commons-text.version>
</properties>
</project>

28
core-java-modules/core-java-string-algorithms-3/src/main/java/com/baeldung/wrappingcharacterwise/Wrapper.java Normal file
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@ -0,0 +1,28 @@
package com.baeldung.wrappingcharacterwise;
import java.lang.IllegalArgumentException;
import java.lang.String;
import java.lang.StringBuilder;
public class Wrapper {
public String wrapStringCharacterWise(String input, int n) {
StringBuilder stringBuilder = new StringBuilder(input);
int index = 0;
while(stringBuilder.length() > index + n) {
int lastLineReturn = stringBuilder.lastIndexOf("\n", index + n);
if (lastLineReturn > index) {
index = lastLineReturn;
} else {
index = stringBuilder.lastIndexOf(" ", index + n);
if (index == -1) {
throw new IllegalArgumentException("impossible to slice " + stringBuilder.substring(0, n));
}
stringBuilder.replace(index, index + 1, "\n");
index++;
}
}
return stringBuilder.toString();
}
}

62
core-java-modules/core-java-string-algorithms-3/src/test/java/com/baeldung/wrappingcharacterwise/WrapperUnitTest.java Normal file
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@ -0,0 +1,62 @@
package com.baeldung.wrappingcharacterwise;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.apache.commons.text.WordUtils;
import org.junit.jupiter.api.Test;
public class WrapperUnitTest {
Wrapper wrapper = new Wrapper();
String lineSeparator = System.lineSeparator();
@Test
void givenStringWithLessThanNCharacters_whenWrapStringCharacterWise_thenUnchanged() {
String input = "short sentence";
assertEquals(input, wrapper.wrapStringCharacterWise(input, 20));
}
@Test
void givenStringWithMoreThanNCharacters_whenWrapStringCharacterWise_thenCorrectlyWrapped() {
String input = "Baeldung is a popular website that provides in-depth tutorials and articles on various programming and software development topics, primarily focused on Java and related technologies.";
assertEquals("Baeldung is a\npopular website that\nprovides in-depth\ntutorials and\narticles on various\nprogramming and\nsoftware development\ntopics, primarily\nfocused on Java and\nrelated\ntechnologies.", wrapper.wrapStringCharacterWise(input, 20));
}
@Test
void givenStringWithATooLongWord_whenWrapStringCharacterWise_thenThrows() {
String input = "The word straightforward has more than 10 characters";
assertThrows(IllegalArgumentException.class, () -> wrapper.wrapStringCharacterWise(input, 10));
}
@Test
void givenStringWithLineReturns_whenWrapStringCharacterWise_thenWrappedAccordingly() {
String input = "Baeldung\nis a popular website that provides in-depth tutorials and articles on various programming and software development topics, primarily focused on Java and related technologies.";
assertEquals("Baeldung\nis a popular\nwebsite that\nprovides in-depth\ntutorials and\narticles on various\nprogramming and\nsoftware development\ntopics, primarily\nfocused on Java and\nrelated\ntechnologies.", wrapper.wrapStringCharacterWise(input, 20));
}
@Test
void givenStringWithLessThanNCharacters_whenWrap_thenUnchanged() {
String input = "short sentence";
assertEquals(input, WordUtils.wrap(input, 20));
}
@Test
void givenStringWithMoreThanNCharacters_whenWrap_thenCorrectlyWrapped() {
String input = "Baeldung is a popular website that provides in-depth tutorials and articles on various programming and software development topics, primarily focused on Java and related technologies.";
assertEquals("Baeldung is a" + lineSeparator + "popular website that" + lineSeparator + "provides in-depth" + lineSeparator + "tutorials and" + lineSeparator + "articles on various" + lineSeparator + "programming and" + lineSeparator + "software development" + lineSeparator + "topics, primarily" + lineSeparator + "focused on Java and" + lineSeparator + "related" + lineSeparator + "technologies.", WordUtils.wrap(input, 20));
}
@Test
void givenStringWithATooLongWord_whenWrap_thenLongWordIsNotWrapped() {
String input = "The word straightforward has more than 10 characters";
assertEquals("The word" + lineSeparator + "straightforward" + lineSeparator + "has more" + lineSeparator + "than 10" + lineSeparator + "characters", WordUtils.wrap(input, 10));
}
@Test
void givenStringWithLineReturns_whenWrap_thenWrappedLikeThereWasNone() {
String input = "Baeldung" + lineSeparator + "is a popular website that provides in-depth tutorials and articles on various programming and software development topics, primarily focused on Java and related technologies.";
assertEquals("Baeldung" + lineSeparator + "is a" + lineSeparator + "popular website that" + lineSeparator + "provides in-depth" + lineSeparator + "tutorials and" + lineSeparator + "articles on various" + lineSeparator + "programming and" + lineSeparator + "software development" + lineSeparator + "topics, primarily" + lineSeparator + "focused on Java and" + lineSeparator + "related" + lineSeparator + "technologies.", WordUtils.wrap(input, 20));
}
}