Support for Google Cloud Storage

README.md

@@ -445,6 +445,27 @@ but most panorama images are large enough that a pyramid will be generated.
 Note that the `X`, `Y`, and `Z` channels in the raw data are calibration images. While these 3 channels appear first
 in the .mcd file, `MCDReader` moves them to the end of the channel list for a better viewing experience in OMERO.
 
+Object Storage
+==============
+
+Support for object storage is handled through Java NIO2.
+Currently, only the output can be on cloud storage, and `--overwrite` is not supported.
+
+AWS S3
+------
+
+S3 support is provided by [s3fs](https://github.com/lasersonlab/Amazon-S3-FileSystem-NIO2/).
+Various parameters can be specified through `--output-options`.
+
+Google Cloud Storage (GCS)
+--------------------------
+
+Credentials are handled through [Application Default Credentials](https://cloud.google.com/docs/authentication/application-default-credentials).
+The credentials used require read/write access to the bucket. (Minimally, this can be `Storage Object Creator`,
+`Storage Object Viewer` and `Storage Object Delete`).
+
+`--output-options` are *not* currently supported with GCS.
+
 License
 =======
 

build.gradle

@@ -47,6 +47,7 @@ dependencies {
     implementation 'javax.xml.bind:jaxb-api:2.3.0'
     implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.3.14'
     implementation group: 'ch.qos.logback', name: 'logback-core', version: '1.3.14'
+    implementation 'com.google.cloud:google-cloud-nio:0.127.26'
 
 
     implementation 'org.openpnp:opencv:4.7.0-0'

src/main/java/com/glencoesoftware/bioformats2raw/Converter.java

@@ -128,7 +128,7 @@ public class Converter implements Callable<Integer> {
   private volatile Path inputPath;
   private volatile String outputLocation;
 
-  private Map<String, String> outputOptions;
+  private Map<String, String> outputOptions = new HashMap<String, String>();
   private volatile Integer pyramidResolutions;
   private volatile List<Integer> seriesList;