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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.util;

import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.pvm.delegate.ModificationObserverBehavior;
import org.camunda.bpm.engine.impl.pvm.process.ActivityImpl;
import org.camunda.bpm.engine.impl.pvm.process.ScopeImpl;
import org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl;

/**
 * @author Svetlana Dorokhova.
 */
public abstract class ModificationUtil {

  public static void handleChildRemovalInScope(ExecutionEntity removedExecution) {
    ActivityImpl activity = removedExecution.getActivity();
    if (activity == null) {
      if (removedExecution.getSuperExecution() != null) {
        removedExecution = removedExecution.getSuperExecution();
        activity = removedExecution.getActivity();
        if (activity == null) {
          return;
        }
      } else {
        return;
      }
    }
    ScopeImpl flowScope = activity.getFlowScope();

    PvmExecutionImpl scopeExecution = removedExecution.getParentScopeExecution(false);
    PvmExecutionImpl executionInParentScope = removedExecution.isConcurrent() ? removedExecution : removedExecution.getParent();

    if (flowScope.getActivityBehavior() != null && flowScope.getActivityBehavior() instanceof ModificationObserverBehavior) {
      // let child removal be handled by the scope itself
      ModificationObserverBehavior behavior = (ModificationObserverBehavior) flowScope.getActivityBehavior();
      behavior.destroyInnerInstance(executionInParentScope);
    }
    else {
      if (executionInParentScope.isConcurrent()) {
        executionInParentScope.remove();
        scopeExecution.tryPruneLastConcurrentChild();
        scopeExecution.forceUpdate();
      }
    }
  }
}