oak-blob-plugins/src/main/java/org/apache/jackrabbit/oak/plugins/blob/datastore/DataStoreBlobStore.java [414:434]:
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    public String getReference(@NotNull String encodedBlobId) {
        checkNotNull(encodedBlobId);
        String blobId = extractBlobId(encodedBlobId);
        //Reference are not created for in memory record
        if (InMemoryDataRecord.isInstance(blobId)) {
            return null;
        }

        DataRecord record;
        try {
            record = delegate.getRecordIfStored(new DataIdentifier(blobId));
            if (record != null) {
                return record.getReference();
            } else {
                log.debug("No blob found for id [{}]", blobId);
            }
        } catch (DataStoreException e) {
            log.warn("Unable to access the blobId for  [{}]", blobId, e);
        }
        return  null;
    }
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oak-upgrade/src/main/java/org/apache/jackrabbit/oak/upgrade/cli/blob/SafeDataStoreBlobStore.java [50:70]:
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    public String getReference(@NotNull String encodedBlobId) {
        checkNotNull(encodedBlobId);
        String blobId = extractBlobId(encodedBlobId);
        //Reference are not created for in memory record
        if (InMemoryDataRecord.isInstance(blobId)) {
            return null;
        }

        DataRecord record;
        try {
            record = delegate.getRecordIfStored(new DataIdentifier(blobId));
            if (record != null) {
                return record.getReference();
            } else {
                log.debug("No blob found for id [{}]", blobId);
            }
        } catch (DataStoreException e) {
            log.warn("Unable to access the blobId for  [{}]", blobId, e);
        }
        return  null;
    }
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