catch NoSuchKeyException for S3Store.exists (#31)

Author: brokkoli71

src/main/java/dev/zarr/zarrjava/store/S3Store.java

@@ -4,13 +4,7 @@
 import software.amazon.awssdk.core.ResponseInputStream;
 import software.amazon.awssdk.core.sync.RequestBody;
 import software.amazon.awssdk.services.s3.S3Client;
-import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
-import software.amazon.awssdk.services.s3.model.GetObjectRequest;
-import software.amazon.awssdk.services.s3.model.GetObjectResponse;
-import software.amazon.awssdk.services.s3.model.HeadObjectRequest;
-import software.amazon.awssdk.services.s3.model.ListObjectsRequest;
-import software.amazon.awssdk.services.s3.model.ListObjectsResponse;
-import software.amazon.awssdk.services.s3.model.PutObjectRequest;
+import software.amazon.awssdk.services.s3.model.*;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -57,7 +51,11 @@ ByteBuffer get(GetObjectRequest getObjectRequest) {
   @Override
   public boolean exists(String[] keys) {
     HeadObjectRequest req = HeadObjectRequest.builder().bucket(bucketName).key(resolveKeys(keys)).build();
-    return s3client.headObject(req).sdkHttpResponse().statusCode() == 200;
+    try {
+      return s3client.headObject(req).sdkHttpResponse().statusCode() == 200;
+    } catch (NoSuchKeyException e) {
+      return false;
+    }
   }
 
   @Nullable
@@ -84,7 +82,7 @@ public ByteBuffer get(String[] keys, long start, long end) {
     GetObjectRequest req = GetObjectRequest.builder()
     .bucket(bucketName)
     .key(resolveKeys(keys))
-    .range(String.valueOf(start)+"-"+String.valueOf(end))
+    .range(start +"-"+ end)
     .build();
     return get(req);
   }

src/test/java/dev/zarr/zarrjava/ZarrStoreTest.java

@@ -61,9 +61,14 @@ public void testS3Store() throws IOException, ZarrException {
             .region(Region.of("eu-west-1"))
             .credentialsProvider(AnonymousCredentialsProvider.create())
             .build(), "static.webknossos.org", "data");
-        Array array = Array.open(s3Store.resolve("zarr_v3", "l4_sample", "color", "1"));
 
-        Assertions.assertArrayEquals(new long[]{1, 4096, 4096, 2048}, array.metadata().shape);
+        Array arrayV3 = Array.open(s3Store.resolve("zarr_v3", "l4_sample", "color", "1"));
+        Assertions.assertArrayEquals(new long[]{1, 4096, 4096, 2048}, arrayV3.metadata().shape);
+        Assertions.assertEquals(0, arrayV3.read(new long[]{0,0,0,0}, new int[]{1,1,1,1}).getInt(0));
+
+        dev.zarr.zarrjava.core.Array arrayCore = dev.zarr.zarrjava.core.Array.open(s3Store.resolve("zarr_v3", "l4_sample", "color", "1"));
+        Assertions.assertArrayEquals(new long[]{1, 4096, 4096, 2048}, arrayCore.metadata().shape);
+        Assertions.assertEquals(0, arrayCore.read(new long[]{0,0,0,0}, new int[]{1,1,1,1}).getInt(0));
     }
 
     @Test