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A Kafka Connect Couchbase connector for copying data between Kafka and Couchbase Server.

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/*
 * Copyright 2017 Couchbase, Inc.
 *
 * 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.couchbase.connect.kafka;

/**
 * The resume modes supported by the Kafka connector.
 */
public enum StreamFrom {
  SAVED_OFFSET_OR_BEGINNING,
  SAVED_OFFSET_OR_NOW,
  BEGINNING,
  NOW;

  /**
   * Returns the "fallback" mode for modes that prefer saved offsets, otherwise returns {@code this}.
   */
  public StreamFrom withoutSavedOffset() {
    switch (this) {
      case SAVED_OFFSET_OR_BEGINNING:
      case BEGINNING:
        return BEGINNING;

      case SAVED_OFFSET_OR_NOW:
      case NOW:
        return NOW;

      default:
        throw new AssertionError();
    }
  }

  /**
   * Returns true if this mode prefers to use saved offset.
   */
  public boolean isSavedOffset() {
    return this != withoutSavedOffset();
  }

  public com.couchbase.client.dcp.StreamFrom asDcpStreamFrom() {
    switch (this) {
      case BEGINNING:
        return com.couchbase.client.dcp.StreamFrom.BEGINNING;
      case NOW:
        return com.couchbase.client.dcp.StreamFrom.NOW;
      default:
        throw new IllegalStateException(this + " has no DCP counterpart");
    }
  }
}