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BAEL-5656 Constructing a Relative Path in Java from Two Absolute Paths or URLs #12726

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Sep 14, 2022
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BAEL-5656 Constructing a Relative Path in Java from Two Absolute Paths or URLs #12726

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5 changes: 5 additions & 0 deletions core-java-modules/core-java-io-apis-2/README.md
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## Core Java IO APIs

This module contains articles about core Java input/output(IO) APIs.

### Relevant Articles:
47 changes: 47 additions & 0 deletions core-java-modules/core-java-io-apis-2/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-io-apis-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-apis-2</name>
<packaging>jar</packaging>

<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>

<dependencies>
<!-- logging -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>

<build>
<finalName>core-java-io-apis-2</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>

</project>
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93 changes: 93 additions & 0 deletions ...a-io-apis-2/src/test/java/com/baeldung/absolutetorelative/AbsoluteToRelativeUnitTest.java
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package com.baeldung.absolutetorelative;

import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;

import java.net.URI;
import java.nio.file.Path;
import java.nio.file.Paths;

public class AbsoluteToRelativeUnitTest {

// given - until using Paths, no need to create physical files
private final Path pathOne = Paths.get("/baeldung/bar/one.txt");
private final Path pathTwo = Paths.get("/baeldung/bar/two.txt");
private final Path pathThree = Paths.get("/baeldung/foo/three.txt");

private final URI uriOne = pathOne.toUri();
private final URI uriTwo = pathTwo.toUri();
private final URI uriThree = pathThree.toUri();

@Test
public void givenAbsolutePaths_whenRelativizePathOneToPathTwo_thenRelativeIsReturned() {
Path result = pathOne.relativize(pathTwo);

Assertions.assertThat(result)
.isRelative()
.isEqualTo(Paths.get("../two.txt"));
}

@Test
public void givenAbsolutePaths_whenRelativizePathTwoToPathOne_thenRelativeIsReturned() {
Path result = pathTwo.relativize(pathOne);

Assertions.assertThat(result)
.isRelative()
.isEqualTo(Paths.get("../one.txt"));
}

@Test
public void givenAbsolutePaths_whenRelativizePathOneParentToPathTwo_thenRelativeIsReturned() {
Path result = pathOne.getParent().relativize(pathTwo);

Assertions.assertThat(result)
.isRelative()
.isEqualTo(Paths.get("two.txt"));
}

@Test
public void givenAbsolutePaths_whenRelativizePathOneToPathThree_thenRelativeIsReturned() {
Path result = pathOne.relativize(pathThree);

Assertions.assertThat(result)
.isRelative()
.isEqualTo(Paths.get("../../foo/three.txt"));
}

@Test
public void givenAbsolutePaths_whenRelativizePathThreeToPathOne_thenRelativeIsReturned() {
Path result = pathThree.relativize(pathOne);

Assertions.assertThat(result)
.isRelative()
.isEqualTo(Paths.get("../../bar/one.txt"));
}

@Test
public void givenAbsoluteURIs_whenRelativizeUriOneToUriTwo_thenAbsoluteIsReturned() {
URI result = uriOne.relativize(uriTwo);

Assertions.assertThat(result)
.asString()
.contains("/baeldung/bar/two.txt");
}

@Test
public void givenAbsoluteURIs_whenRelativizeUriOneParentToUriTwo_thenRelativeIsReturned() {
URI result = pathOne.getParent().toUri().relativize(uriTwo);

Assertions.assertThat(result)
.asString()
.contains("two.txt");
}

@Test
public void givenAbsoluteURIs_whenRelativizeUriOneParentToUriThree_thenAbsoluteIsReturned() {
URI result = pathOne.getParent().toUri().relativize(uriThree);

Assertions.assertThat(result)
.asString()
.contains("/baeldung/foo/three.txt");
}

}
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1 change: 1 addition & 0 deletions core-java-modules/pom.xml
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<module>core-java-io-3</module>
<module>core-java-io-4</module>
<module>core-java-io-apis</module>
<module>core-java-io-apis-2</module>
<module>core-java-io-conversions</module>
<module>core-java-jar</module>
<module>core-java-jndi</module>
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