diff --git a/core-java-modules/core-java-io-3/src/main/java/com/baeldung/lastmodifiedfile/LastModifiedFileApp.java b/core-java-modules/core-java-io-3/src/main/java/com/baeldung/lastmodifiedfile/LastModifiedFileApp.java new file mode 100644 index 0000000000..d2aace184f --- /dev/null +++ b/core-java-modules/core-java-io-3/src/main/java/com/baeldung/lastmodifiedfile/LastModifiedFileApp.java @@ -0,0 +1,61 @@ +package com.baeldung.lastmodifiedfile; + +import java.io.File; +import java.io.FileFilter; +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.util.Arrays; +import java.util.Optional; + +import org.apache.commons.io.comparator.LastModifiedFileComparator; +import org.apache.commons.io.filefilter.FileFilterUtils; + +public class LastModifiedFileApp { + + public static File findUsingIOApi(String sdir) { + File dir = new File(sdir); + if (dir.isDirectory()) { + Optional opFile = Arrays.stream(dir.listFiles(File::isFile)) + .max((f1, f2) -> Long.compare(f1.lastModified(), f2.lastModified())); + + if (opFile.isPresent()) { + return opFile.get(); + } + } + + return null; + } + + public static Path findUsingNIOApi(String sdir) throws IOException { + Path dir = Paths.get(sdir); + if (Files.isDirectory(dir)) { + Optional opPath = Files.list(dir) + .filter(p -> !Files.isDirectory(p)) + .sorted((p1, p2) -> Long.valueOf(p2.toFile().lastModified()) + .compareTo(p1.toFile().lastModified())) + .findFirst(); + + if (opPath.isPresent()) { + return opPath.get(); + } + } + + return null; + } + + public static File findUsingCommonsIO(String sdir) { + File dir = new File(sdir); + if (dir.isDirectory()) { + File[] dirFiles = dir.listFiles((FileFilter) FileFilterUtils.fileFileFilter()); + if (dirFiles != null && dirFiles.length > 0) { + Arrays.sort(dirFiles, LastModifiedFileComparator.LASTMODIFIED_REVERSE); + return dirFiles[0]; + } + } + + return null; + } + +} diff --git a/core-java-modules/core-java-io-3/src/test/java/com/baeldung/lastmodifiedfile/LastModifiedFileAppUnitTest.java b/core-java-modules/core-java-io-3/src/test/java/com/baeldung/lastmodifiedfile/LastModifiedFileAppUnitTest.java new file mode 100644 index 0000000000..fe704c3c40 --- /dev/null +++ b/core-java-modules/core-java-io-3/src/test/java/com/baeldung/lastmodifiedfile/LastModifiedFileAppUnitTest.java @@ -0,0 +1,78 @@ +package com.baeldung.lastmodifiedfile; + +import static org.assertj.core.api.Assertions.assertThat; + +import java.io.File; +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.Paths; + +import org.apache.commons.io.FileUtils; +import org.junit.jupiter.api.AfterAll; +import org.junit.jupiter.api.BeforeAll; +import org.junit.jupiter.api.Test; + +public class LastModifiedFileAppUnitTest { + + private final static String SOURCEDIRECTORY = "src/test/resources/lastmodfiles"; + + @BeforeAll + public static void setUpFiles() throws IOException, InterruptedException { + File srcDir = new File(SOURCEDIRECTORY); + if (!srcDir.exists()) { + srcDir.mkdir(); + } + + FileUtils.cleanDirectory(srcDir); + + File file01 = new File(SOURCEDIRECTORY + "/file01.txt"); + file01.createNewFile(); + + Thread.sleep(2000); + + File file02 = new File(SOURCEDIRECTORY + "/file02.txt"); + file02.createNewFile(); + + Thread.sleep(2000); + + File file03 = new File(SOURCEDIRECTORY + "/file03.txt"); + file03.createNewFile(); + + Thread.sleep(2000); + + Files.write(Paths.get(SOURCEDIRECTORY + "/file02.txt"), "Hello File02".getBytes()); + + } + + @Test + public void givenDirectory_whenUsingIoApi_thenFindLastModfile() throws IOException { + File lastModFile = LastModifiedFileApp.findUsingIOApi(SOURCEDIRECTORY); + + assertThat(lastModFile).isNotNull(); + assertThat(lastModFile.getName()).isEqualTo("file02.txt"); + } + + @Test + public void givenDirectory_whenUsingNioApi_thenFindLastModfile() throws IOException { + Path lastModPath = LastModifiedFileApp.findUsingNIOApi(SOURCEDIRECTORY); + + assertThat(lastModPath).isNotNull(); + assertThat(lastModPath.toFile().getName()).isEqualTo("file02.txt"); + } + + @Test + public void givenDirectory_whenUsingApacheCommons_thenFindLastModfile() throws IOException { + File lastModFile = LastModifiedFileApp.findUsingCommonsIO(SOURCEDIRECTORY); + + assertThat(lastModFile).isNotNull(); + assertThat(lastModFile.getName()).isEqualTo("file02.txt"); + } + + @AfterAll + public static void cleanUp() throws IOException { + File srcDir = new File(SOURCEDIRECTORY); + FileUtils.deleteDirectory(srcDir); + } + +} \ No newline at end of file