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remove file extensions

This commit is contained in:
Kai Yuan 2020-11-25 00:03:34 +01:00
parent 282db45191
commit 32dba7dd06
2 changed files with 86 additions and 0 deletions
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14
core-java-modules/core-java-io-3/src/main/java/com/baeldung/filenamewithoutextension/MyFilenameUtil.java Normal file
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package com.baeldung.filenamewithoutextension;
public class MyFilenameUtil {
private MyFilenameUtil() {}
public static String removeFileExtension(String filename, boolean removeAllExtensions) {
if (filename == null || filename.isEmpty()) {
return filename;
}
String extPattern = "(?<!^)[.]" + (removeAllExtensions ? ".*" : "[^.]*$");
return filename.replaceAll(extPattern, "");
}
}

72
core-java-modules/core-java-io-3/src/test/java/com/baeldung/filenamewithoutextension/FileNameDelExtensionUnitTest.java Normal file
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package com.baeldung.filenamewithoutextension;
import com.google.common.io.Files;
import org.apache.commons.io.FilenameUtils;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
public class FileNameDelExtensionUnitTest {
@Test
public void givenDotFileWithoutExt_whenCallGuavaMethod_thenCannotGetDesiredResult() {
//negative assertion
assertNotEquals(".baeldung", Files.getNameWithoutExtension(".baeldung"));
}
@Test
public void givenFileWithoutMultipleExt_whenCallGuavaMethod_thenCannotRemoveAllExtensions() {
//negative assertion
assertNotEquals("baeldung", Files.getNameWithoutExtension("baeldung.tar.gz"));
}
@Test
public void givenDotFileWithoutExt_whenCallApacheCommonsMethod_thenCannotGetDesiredResult() {
//negative assertion
assertNotEquals(".baeldung", FilenameUtils.removeExtension(".baeldung"));
}
@Test
public void givenFileWithoutMultipleExt_whenCallApacheCommonsMethod_thenCannotRemoveAllExtensions() {
//negative assertion
assertNotEquals("baeldung", FilenameUtils.removeExtension("baeldung.tar.gz"));
}
@Test
public void givenFilenameNoExt_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals("baeldung", MyFilenameUtil.removeFileExtension("baeldung", true));
assertEquals("baeldung", MyFilenameUtil.removeFileExtension("baeldung", false));
}
@Test
public void givenSingleExt_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals("baeldung", MyFilenameUtil.removeFileExtension("baeldung.txt", true));
assertEquals("baeldung", MyFilenameUtil.removeFileExtension("baeldung.txt", false));
}
@Test
public void givenDotFile_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals(".baeldung", MyFilenameUtil.removeFileExtension(".baeldung", true));
assertEquals(".baeldung", MyFilenameUtil.removeFileExtension(".baeldung", false));
}
@Test
public void givenDotFileWithExt_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals(".baeldung", MyFilenameUtil.removeFileExtension(".baeldung.conf", true));
assertEquals(".baeldung", MyFilenameUtil.removeFileExtension(".baeldung.conf", false));
}
@Test
public void givenDoubleExt_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals("baeldung", MyFilenameUtil.removeFileExtension("baeldung.tar.gz", true));
assertEquals("baeldung.tar", MyFilenameUtil.removeFileExtension("baeldung.tar.gz", false));
}
@Test
public void givenDotFileWithDoubleExt_whenCallFilenameUtilMethod_thenGetExpectedFilename() {
assertEquals(".baeldung", MyFilenameUtil.removeFileExtension(".baeldung.conf.bak", true));
assertEquals(".baeldung.conf", MyFilenameUtil.removeFileExtension(".baeldung.conf.bak", false));
}
}