text: /*
   * Copyright 2017-present Open Networking Foundation
   *
   * 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 org.onosproject.incubator.net.virtual.impl.intent;
  
  import org.onosproject.incubator.net.virtual.NetworkId;
  import org.onosproject.net.intent.Intent;
  import org.onosproject.net.intent.IntentData;
  
  import java.util.List;
  import java.util.Optional;
  
  /**
   * A collection of methods to process an intent for virtual networks.
   *
   * This interface is public, but intended to be used only by IntentManager and
   * IntentProcessPhase subclasses stored under phase package.
   */
  public interface VirtualIntentProcessor {
      /**
       * Compiles an intent recursively.
       *
       * @param networkId virtual network identifier
       * @param intent intent
       * @param previousInstallables previous intent installables
       * @return result of compilation
       */
      List<Intent> compile(NetworkId networkId, Intent intent, List<Intent> previousInstallables);
  
      /**
       * Applies intents.
       *
       * @param networkId virtual network identifier
       * @param toUninstall Intent data describing flows to uninstall.
       * @param toInstall Intent data describing flows to install.
       */
      void apply(NetworkId networkId, Optional<IntentData> toUninstall,
                 Optional<IntentData> toInstall);
  }
  