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/*
 * Copyright 2015 Google LLC
 *
 * Licensed 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 com.google.cloud.bigquery;

import com.google.cloud.BaseServiceException;
import com.google.cloud.RetryHelper.RetryHelperException;
import com.google.cloud.http.BaseHttpServiceException;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ExecutionException;

/**
 * BigQuery service exception.
 *
 * @see Google Cloud BigQuery
 *     error codes
 */
public final class BigQueryException extends BaseHttpServiceException {

  // see: https://cloud.google.com/bigquery/troubleshooting-errors
  private static final Set RETRYABLE_ERRORS =
      ImmutableSet.of(
          new Error(500, null), new Error(502, null), new Error(503, null), new Error(504, null));
  private static final long serialVersionUID = -5006625989225438209L;

  private final List errors;

  public BigQueryException(int code, String message) {
    this(code, message, (Throwable) null);
  }

  public BigQueryException(int code, String message, Throwable cause) {
    super(code, message, null, true, RETRYABLE_ERRORS, cause);
    this.errors = null;
  }

  public BigQueryException(int code, String message, BigQueryError error) {
    super(code, message, error != null ? error.getReason() : null, true, RETRYABLE_ERRORS);
    this.errors = Arrays.asList(error);
  }

  public BigQueryException(List errors) {
    super(
        0,
        errors != null ? errors.get(0).getMessage() : null,
        errors != null ? errors.get(0).getReason() : null,
        true,
        RETRYABLE_ERRORS);
    this.errors = errors;
  }

  public BigQueryException(IOException exception) {
    super(exception, true, RETRYABLE_ERRORS);
    List errors = null;
    if (getReason() != null) {
      errors =
          Arrays.asList(
              new BigQueryError(getReason(), getLocation(), getMessage(), getDebugInfo()));
    }
    this.errors = errors;
  }

  /**
   * Returns the {@link BigQueryError} that caused this exception. Returns {@code null} if none
   * exists.
   */
  public BigQueryError getError() {
    return errors == null || errors.isEmpty() || errors.size() == 0 ? null : errors.get(0);
  }

  /**
   * Returns a list of {@link BigQueryError}s that caused this exception. Returns {@code null} if
   * none exists.
   */
  public List getErrors() {
    return errors;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (!(obj instanceof BigQueryException)) {
      return false;
    }
    BigQueryException other = (BigQueryException) obj;
    return super.equals(other) && Objects.equals(errors, other.errors);
  }

  @Override
  public int hashCode() {
    return Objects.hash(super.hashCode(), errors);
  }

  /**
   * Translate RetryHelperException to the BigQueryException that caused the error. This method will
   * always throw an exception.
   *
   * @throws BigQueryException when {@code ex} was caused by a {@code BigQueryException}
   */
  static BaseServiceException translateAndThrow(RetryHelperException ex) {
    BaseServiceException.translate(ex);
    throw new BigQueryException(UNKNOWN_CODE, ex.getMessage(), ex.getCause());
  }

  static BaseServiceException translateAndThrow(
      BigQueryRetryHelper.BigQueryRetryHelperException ex) {
    if (ex.getCause() instanceof BaseServiceException) {
      throw (BaseServiceException) ex.getCause();
    }
    throw new BigQueryException(UNKNOWN_CODE, ex.getMessage(), ex.getCause());
  }

  static BaseServiceException translateAndThrow(ExecutionException ex) {
    BaseServiceException.translate(ex);
    throw new BigQueryException(UNKNOWN_CODE, ex.getMessage(), ex.getCause());
  }
}