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package org.activiti.engine.impl.db;

import org.activiti.engine.impl.persistence.entity.*;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;


/**
 * Maintains a list of all the entities in order of dependency.
 */
public class EntityDependencyOrder {
	
	public static List> DELETE_ORDER = new ArrayList>();
	public static List> INSERT_ORDER = new ArrayList>();
	
	static {
		
		/*
		 * In the comments below:
		 * 
		 * 'FK to X' : X should be BELOW the entity
		 * 
		 * 'FK from X': X should be ABOVE the entity
		 * 
		 */
	
		/* No FK */
		DELETE_ORDER.add(PropertyEntityImpl.class);
		
		/* No FK */
		DELETE_ORDER.add(AttachmentEntityImpl.class);
		
		/* No FK */
		DELETE_ORDER.add(CommentEntityImpl.class);
		
		/* No FK */
		DELETE_ORDER.add(EventLogEntryEntityImpl.class);
		
		/*
		 * FK to Deployment
		 * FK to ByteArray 
		 */
		DELETE_ORDER.add(ModelEntityImpl.class); 
		
		/*
		 * FK to ByteArray
		 */
		DELETE_ORDER.add(JobEntityImpl.class);
		DELETE_ORDER.add(TimerJobEntityImpl.class);
		DELETE_ORDER.add(SuspendedJobEntityImpl.class);
		DELETE_ORDER.add(DeadLetterJobEntityImpl.class);
		
		/*
		 * FK to ByteArray
		 * FK to Exeution
		 */
		DELETE_ORDER.add(VariableInstanceEntityImpl.class);
		
		/* 
		 * FK to ByteArray
		 * FK to ProcessDefinition
		 */
		DELETE_ORDER.add(ProcessDefinitionInfoEntityImpl.class);
		
		/*
		 * FK from ModelEntity
		 * FK from JobEntity
		 * FK from VariableInstanceEntity
		 * 
		 * FK to DeploymentEntity
		 */
		DELETE_ORDER.add(ByteArrayEntityImpl.class);
		
		/*
		 * FK from ModelEntity
		 * FK from JobEntity
		 * FK from VariableInstanceEntity
		 * 
		 * FK to DeploymentEntity
		 */
		DELETE_ORDER.add(ResourceEntityImpl.class);
		
		/*
		 * FK from ByteArray
		 */
		DELETE_ORDER.add(DeploymentEntityImpl.class);
		
		/*
		 * FK to Execution
		 */
		DELETE_ORDER.add(EventSubscriptionEntityImpl.class);
		
		/*
		 * FK to Execution
		 */
		DELETE_ORDER.add(CompensateEventSubscriptionEntityImpl.class);
		
		/*
		 * FK to Execution
		 */
		DELETE_ORDER.add(MessageEventSubscriptionEntityImpl.class);
		
		/*
		 * FK to Execution
		 */
		DELETE_ORDER.add(SignalEventSubscriptionEntityImpl.class);
		
		
		/*
		 * FK to process definition
		 * FK to Execution
		 * FK to Task
		 */
		DELETE_ORDER.add(IdentityLinkEntityImpl.class);
		
		/*
		 * FK from IdentityLink
		 * 
		 * FK to Execution
		 * FK to process definition
		 */
		DELETE_ORDER.add(TaskEntityImpl.class);
		
		/*
		 * FK from VariableInstance 
		 * FK from EventSubscription
		 * FK from IdentityLink
		 * FK from Task
		 * 
		 * FK to ProcessDefinition
		 */
		DELETE_ORDER.add(ExecutionEntityImpl.class);
		
		/*
		 * FK from Task
		 * FK from IdentityLink
		 * FK from execution
		 */
		DELETE_ORDER.add(ProcessDefinitionEntityImpl.class);


	  
	  // History entities have no FK's
	  
		DELETE_ORDER.add(HistoricIdentityLinkEntityImpl.class);

	  
		DELETE_ORDER.add(HistoricActivityInstanceEntityImpl.class);
		DELETE_ORDER.add(HistoricProcessInstanceEntityImpl.class);
		DELETE_ORDER.add(HistoricTaskInstanceEntityImpl.class);
		DELETE_ORDER.add(HistoricScopeInstanceEntityImpl.class);
	  
		DELETE_ORDER.add(HistoricVariableInstanceEntityImpl.class);
	  
		DELETE_ORDER.add(HistoricDetailAssignmentEntityImpl.class);
		DELETE_ORDER.add(HistoricDetailTransitionInstanceEntityImpl.class);
		DELETE_ORDER.add(HistoricDetailVariableInstanceUpdateEntityImpl.class);
		DELETE_ORDER.add(HistoricFormPropertyEntityImpl.class);
		DELETE_ORDER.add(HistoricDetailEntityImpl.class);
		
		INSERT_ORDER = new ArrayList>(DELETE_ORDER);
		Collections.reverse(INSERT_ORDER);

	}

}