Merge pull request #9926 from eugenp/feature/BAEL-4142

BAEL-4132: How to create a temporary directory/folder in Java?

core-java-modules/core-java-io-3/src/test/java/com/baeldung/tempdirectory/TemporaryDirectoriesUnitTest.java

@@ -0,0 +1,75 @@
+package com.baeldung.tempdirectory;
+
+import org.apache.commons.io.FileUtils;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.FileAttribute;
+import java.nio.file.attribute.PosixFileAttributes;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.Set;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+/**
+ * Tests several possibilities on how to create
+ * temporary directories.
+ *
+ * @author Rui Vilao (rpvilao@gmail.com)
+ */
+public class TemporaryDirectoriesUnitTest {
+
+    @Test
+    public void givenTempDirWithPrefixNoTargetSpecified_whenCreateWithPlainJava_thenInsideOSTempDirStructure() throws IOException {
+        final String tmpdir = Files.createTempDirectory("tmpDirPrefix").toFile().getAbsolutePath();
+        final String tmpDirsLocation = System.getProperty("java.io.tmpdir");
+
+        assertThat(tmpdir).startsWith(tmpDirsLocation);
+    }
+
+    @Test
+    public void givenTempDirWithPrefixNoTargetSpecified_whenCreateWithGuava_thenInsideOSTempDirStructure() throws IOException {
+        final String tmpdir = com.google.common.io.Files.createTempDir().getAbsolutePath();
+        final String tmpDirsLocation = System.getProperty("java.io.tmpdir");
+
+        assertThat(tmpdir).startsWith(tmpDirsLocation);
+    }
+
+    @Test
+    public void givenTempDirWithPrefixNoTargetSpecified_whenCreateWithApacheCommonsIo_thenInsideOSTempDirStructure() throws IOException {
+        final String tmpDirsLocation = System.getProperty("java.io.tmpdir");
+        final Path path = Paths.get(FileUtils.getTempDirectory().getAbsolutePath(), UUID.randomUUID().toString());
+        final String tmpdir = Files.createDirectories(path).toFile().getAbsolutePath();
+
+        assertThat(tmpdir).startsWith(tmpDirsLocation);
+    }
+
+    @Test
+    public void givenTempDirWithPrefixWithTargetSpecified_whenCreatePlainJava_thenInsideTarget() throws IOException {
+        final Path tmpdir = Files.createTempDirectory(Paths.get("target"), "tmpDirPrefix");
+        assertThat(tmpdir.toFile().getPath()).startsWith("target");
+    }
+
+    @Test
+    public void givenTempDirWithPrefixWithTargetSpecifiedWithDeleteOnExit_whenCreatePlainJava_thenInsideTarget() throws IOException {
+        final Path tmpdir = Files.createTempDirectory(Paths.get("target"), "tmpDirPrefix");
+        assertThat(tmpdir.toFile().getPath()).startsWith("target");
+        tmpdir.toFile().deleteOnExit();
+        // we can really assert this test, just as an example.
+    }
+
+    @Test
+    public void givenTempDirWithPrefixWithFileAttrs_whenCreatePlainJava_thenAttributesAreSet() throws IOException {
+        final FileAttribute<Set<PosixFilePermission>> attrs = PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("r--------"));
+
+        final Path tmpdir = Files.createTempDirectory(Paths.get("target"), "tmpDirPrefix", attrs);
+        assertThat(tmpdir.toFile().getPath()).startsWith("target");
+        assertThat(tmpdir.toFile().canWrite()).isFalse();
+    }
+}