Storage Client doesn't offer method to update blob metadata about java-storage HOT 3 CLOSED

Updating user provided blob metadata is possible with the Java client, it's just not necessarily intuitive. You have to unset the metadata first and then update it with a complete map. How to do so is documented here. With this you could simulate updating a single field by loading the map returned by blob.getMetadata() into a copy, editing the value you want to update in the copy, and then using blob.update() after nulling the original map to set the new metadata map to the copy.

We can look into adding a method for specifically updating one field, but I hope this unblocks you in the meantime.

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Updating user provided blob metadata is possible in the same way as updating other Blob information Storage.update() method.
The code below demonstrates how to do this:

        Map<String, String> init = new HashMap<>();
        init.put("a", "b");
        init.put("c", "d");
        BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setMetadata(init).build();
        Blob blob = storage.create(blobInfo);
        System.out.println("initial: " + blob.getMetadata());


        Map<String, String> update = new HashMap<>();
        update.put("x", "y");
        update.put("c", null);
        BlobInfo blobUpdate = BlobInfo.newBuilder(blobId).setMetadata(update).build();
        blob = storage.update(blobUpdate);
        System.out.println("updated: " + blob.getMetadata());

The output:

initial: {a=b, c=d}
updated: {x=y, a=b}

from java-storage.

@JesseLovelace, @jkubrynski
Can we close this issue?

from java-storage.