[ BAEL-2978 ]: Determine file creation date in java (eugenp#7099)

lukaszrys · jzheaux · commit 847ad4d0ddd5 · 2019-06-11T21:21:06.000-06:00
* [ BAEL-2978 ]: Determine file creation date in java
diff --git a/core-java-modules/core-java-nio/README.md b/core-java-modules/core-java-nio/README.md
@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [Determine File Creating Date in Java](https://www.baeldung.com/file-creation-date-java)
diff --git a/core-java-modules/core-java-nio/src/main/java/com/baeldung/creationdate/CreationDateResolver.java b/core-java-modules/core-java-nio/src/main/java/com/baeldung/creationdate/CreationDateResolver.java
@@ -0,0 +1,35 @@
+package com.baeldung.creationdate;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.nio.file.attribute.FileTime;
+import java.time.Instant;
+import java.util.Optional;
+
+public class CreationDateResolver {
+
+    public Instant resolveCreationTimeWithBasicAttributes(Path path) {
+        try {
+            final BasicFileAttributes attr = Files.readAttributes(path, BasicFileAttributes.class);
+            final FileTime fileTime = attr.creationTime();
+
+            return fileTime.toInstant();
+        } catch (IOException ex) {
+            throw new RuntimeException("An issue occured went wrong when resolving creation time", ex);
+        }
+    }
+
+    public Optional<Instant> resolveCreationTimeWithAttribute(Path path) {
+        try {
+            final FileTime creationTime = (FileTime) Files.getAttribute(path, "creationTime");
+
+            return Optional
+              .ofNullable(creationTime)
+              .map((FileTime::toInstant));
+        } catch (IOException ex) {
+            throw new RuntimeException("An issue occured went wrong when resolving creation time", ex);
+        }
+    }
+}
diff --git a/core-java-modules/core-java-nio/src/test/java/com/baeldung/creationdate/CreationDateResolverUnitTest.java b/core-java-modules/core-java-nio/src/test/java/com/baeldung/creationdate/CreationDateResolverUnitTest.java
@@ -0,0 +1,45 @@
+package com.baeldung.creationdate;
+
+import org.junit.Test;
+
+import java.io.File;
+import java.nio.file.Path;
+import java.time.Instant;
+import java.util.Optional;
+
+import static org.junit.Assert.assertTrue;
+
+public class CreationDateResolverUnitTest {
+
+    private final CreationDateResolver creationDateResolver = new CreationDateResolver();
+
+    @Test
+    public void givenFile_whenGettingCreationDateTimeFromBasicAttributes_thenReturnDate() throws Exception {
+
+        final File file = File.createTempFile("createdFile", ".txt");
+        final Path path = file.toPath();
+
+        final Instant response = creationDateResolver.resolveCreationTimeWithBasicAttributes(path);
+
+        assertTrue(Instant
+          .now()
+          .isAfter(response));
+
+    }
+
+    @Test
+    public void givenFile_whenGettingCreationDateTimeFromAttribute_thenReturnDate() throws Exception {
+
+        final File file = File.createTempFile("createdFile", ".txt");
+        final Path path = file.toPath();
+
+        final Optional<Instant> response = creationDateResolver.resolveCreationTimeWithAttribute(path);
+
+        response.ifPresent((value) -> {
+            assertTrue(Instant
+              .now()
+              .isAfter(value));
+        });
+
+    }
+}

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+## Relevant articles:`
	`2`	`+`
	`3`	`+- [Determine File Creating Date in Java](https://www.baeldung.com/file-creation-date-java)`