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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.storage.cloudfiles;

import com.google.common.base.Predicate;
import org.apache.druid.java.util.common.RetryUtils;
import org.apache.druid.java.util.common.RetryUtils.Task;

import java.io.IOException;

/**
 *
 */
public class CloudFilesUtils
{

  public static final Predicate CLOUDFILESRETRY = new Predicate()
  {
    @Override
    public boolean apply(Throwable e)
    {
      if (e == null) {
        return false;
      } else if (e instanceof IOException) {
        return true;
      } else {
        return apply(e.getCause());
      }
    }
  };

  /**
   * Retries CloudFiles operations that fail due to io-related exceptions.
   */
  public static  T retryCloudFilesOperation(Task f, final int maxTries) throws Exception
  {
    return RetryUtils.retry(f, CLOUDFILESRETRY, maxTries);
  }

  public static String buildCloudFilesPath(String basePath, final String fileName)
  {
    String path = fileName;
    if (!basePath.isEmpty()) {
      int lastSlashIndex = basePath.lastIndexOf('/');
      if (lastSlashIndex != -1) {
        basePath = basePath.substring(0, lastSlashIndex);
      }
      path = basePath + "/" + fileName;
    }
    return path;
  }

}