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/* 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.activiti.engine.impl.pvm.runtime;

import java.util.List;


/**
 * @author Tom Baeyens
 */
public class AtomicOperationDeleteCascade implements AtomicOperation {
  
  public boolean isAsync(InterpretableExecution execution) {
    return false;
  }

  public void execute(InterpretableExecution execution) {
    InterpretableExecution firstLeaf = findFirstLeaf(execution);
    
    if (firstLeaf.getSubProcessInstance()!=null) {
      firstLeaf.getSubProcessInstance().deleteCascade(execution.getDeleteReason());
    }

    firstLeaf.performOperation(AtomicOperation.DELETE_CASCADE_FIRE_ACTIVITY_END);
  }

  @SuppressWarnings("unchecked")
  protected InterpretableExecution findFirstLeaf(InterpretableExecution execution) {
    List executions = (List) execution.getExecutions();
    if (!executions.isEmpty()) {
      return findFirstLeaf(executions.get(0));
    }
    return execution;
  }
}