/*
 * 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.hadoop.ozone.om.request.validation;

import java.lang.annotation.Annotation;
import org.apache.hadoop.ozone.ClientVersion;
import org.apache.hadoop.ozone.Versioned;
import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos.OMRequest;
import org.apache.hadoop.ozone.upgrade.LayoutVersionManager;

/**
 * Class to extract version out of OM request.
 */
public enum VersionExtractor {
  /**
   * Extracts current metadata layout version.
   */
  LAYOUT_VERSION_EXTRACTOR {
    @Override
    public Versioned extractVersion(OMRequest req, ValidationContext ctx) {
      LayoutVersionManager layoutVersionManager = ctx.versionManager();
      return ctx.versionManager().getFeature(layoutVersionManager.getMetadataLayoutVersion());
    }

    @Override
    public Class<? extends Annotation> getValidatorClass() {
      return OMLayoutVersionValidator.class;
    }
  },

  /**
   * Extracts client version from the OMRequests.
   */
  CLIENT_VERSION_EXTRACTOR {
    @Override
    public Versioned extractVersion(OMRequest req, ValidationContext ctx) {
      return req.getVersion() > ClientVersion.CURRENT_VERSION ?
          ClientVersion.FUTURE_VERSION : ClientVersion.fromProtoValue(req.getVersion());
    }

    @Override
    public Class<? extends Annotation> getValidatorClass() {
      return OMClientVersionValidator.class;
    }
  };

  public abstract Versioned extractVersion(OMRequest req, ValidationContext ctx);

  public abstract Class<? extends Annotation> getValidatorClass();
}
