package ever.workflowRepresentation;

import java.io.Serializable;
import java.util.ArrayList;

import javax.xml.stream.XMLStreamWriter;

import ever.pipeline.Sentence;
/**
 * This abstract class is used to derive Task, XOR and AND Elements for it. 
 * @author Pol Schumacher, Wirtschaftsinformatik, Institut fuer Informatik, Goethe Universitaet Frankfurt
 *
 */
public abstract class WorkflowElement implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 5;

	private WorkflowElement next;
	
	//Rdf ressource name
	private String resName;
	private static ArrayList<WorkflowElement> wfElements = new ArrayList<WorkflowElement>();
//	private static int lastId=-1;
//	private int elementId;
	public Sentence relatedSentence;
	private WorkflowElement parentElement;
	/**
	 * Sets id and adds the Element to the list of elements
	 */
	public WorkflowElement(WorkflowElement parent, Sentence s)
	{
		parentElement=parent;
//		lastId++;
//		this.elementId=lastId;
		WorkflowElement.wfElements.add(this);
		relatedSentence=s;
	}	
	
	public WorkflowElement()
	{
//		lastId++;
//		this.elementId=lastId;
		WorkflowElement.wfElements.add(this);		
	}
	/**
	 * The id is unique WorkflowElements (And, XOR, Sequence and Tasks) Dataobjects use a different id set
	 * @return id of the workflow 
	 */
	public int getId()
	{
		return 1;
	}
	
		
	/**
	 * Writes the xml representation of the current workflowelement 
	 * @param writer to write into
	 */
	public abstract void exportWf2Xml(XMLStreamWriter writer);
		
//	/**
//	 * Write the xml representation of the current workflowelement for artificially generated workflowelements.
//	 * @param writer
//	 */
//	public abstract void exportWf2XmlArti(XMLStreamWriter writer);
	
	/**
	 * Add related sentence to workflow element to be able to track the origin of an element
	 * @param sen
	 */
	public void addRelSentence(Sentence sen)
	{
		relatedSentence=sen;
	}
	
//	public void setNext(WorkflowElement next)
//	{
//		this.next=next;
//	}
	
	@Deprecated
	public String getResName() {
		return resName;
	}
	
	@Deprecated
	public void setResName(String resName) {
		this.resName = resName;
	}
	
	
	/**
	 * Resets id generator and workflowelement list 
	 */
	public static void reset()
	{
		WorkflowElement.wfElements=new ArrayList<WorkflowElement>();
//		lastId=-1;
	}
	
	

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((next == null) ? 0 : next.hashCode());
		result = prime * result
				+ ((relatedSentence == null) ? 0 : relatedSentence.hashCode());
		result = prime * result + ((resName == null) ? 0 : resName.hashCode());
		
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		WorkflowElement other = (WorkflowElement) obj;
		if (next == null) {
			if (other.next != null)
				return false;
		} else if (!next.equals(other.next))
			return false;
		if (relatedSentence == null) {
			if (other.relatedSentence != null)
				return false;
		} else if (!relatedSentence.equals(other.relatedSentence))
			return false;
		if (resName == null) {
			if (other.resName != null)
				return false;
		} else if (!resName.equals(other.resName))
			return false;
		
		return true;
	}
/**
 * Returns the parent ELement of the element
 * @return
 */
	public WorkflowElement getParentElement() {
		return parentElement;
	}
	/**
	 * Sets new parent eLement for the element
	 * @param the new parent element
	 * 	 */
	public void setParentElement(WorkflowElement parentSequence) {
		this.parentElement = parentSequence;
	}
	
	
	
	
		
	
	
	
	
}