net.snowflake.client.jdbc.cloud.storage.AzureObjectSummariesIterator Maven / Gradle / Ivy

/*
 * Copyright (c) 2012-2018 Snowflake Computing Inc. All rights reserved.
 */

package net.snowflake.client.jdbc.cloud.storage;

import com.amazonaws.services.kms.model.UnsupportedOperationException;
import com.microsoft.azure.storage.blob.CloudBlob;
import com.microsoft.azure.storage.blob.ListBlobItem;

import java.util.Iterator;

/**
 * Iterator class for ObjectSummary objects on Azure
 * Returns platform-independent instances (StorageObjectSummary)
 *
 * @author lgiakoumakis
 */
public class AzureObjectSummariesIterator implements Iterator
{
  Iterator itemIterator;

  /*
   * Constructs a summaries iterator object from an iterable derived by a
   * lostBlobs method
   * @param azCloudBlobIterable an iterable set of ListBlobItems
   */
  public AzureObjectSummariesIterator(Iterable  azCloudBlobIterable)
  {
    itemIterator = azCloudBlobIterable.iterator();
  }

  public boolean hasNext()
  {
    return  itemIterator.hasNext();
  }

  public StorageObjectSummary next()
  {
    ListBlobItem listBlobItem = itemIterator.next();

    if(!(listBlobItem instanceof CloudBlob))
    {
      // The only other possible type would a CloudDirectory
      // This should never happen since we are listing items as a flat list
      throw new IllegalArgumentException("Unexpected listBlobItem instace type");
    }

    return StorageObjectSummary.createFromAzureListBlobItem(listBlobItem);
  }

  public void remove() {
    throw new UnsupportedOperationException("remove() method not supported");
  }

}