/* Title:		OperationMeta.java
 * Version	
 * Author		Sada
 * Company: USDA-ARS
 * Date:    July, 2003
 * Description: This class holds information which DEFINES an operation (through actionMeta).
 * 
 */
package usda.weru.mcrew;

import java.util.Enumeration;
import java.util.Hashtable;

import org.w3c.dom.*;
import org.w3c.dom.traversal.*;
import org.xml.sax.SAXException;


/**
 * j
 */
public class OperationMeta extends ObjectMeta
{
	private
		Hashtable mActions; //holds as many actionMetas as there are actions
		ActionMeta mDefaultAction; 
		
        /**
         * j
         */        
	public OperationMeta()
	{
		mActions = new Hashtable();
		mDefaultAction = null;
                //System.out.println("Operation Meta : NO Argument CONSTRUCTOR with mActions NEW Hashtable");
	}
	
    /**
     *
     * @param pObjectName
     */    
	public OperationMeta(String pObjectName)
	{
		mActions = new Hashtable();
		mObjectName = pObjectName;
                //System.out.println("Operation Meta : 1 Argument CONSTRUCTOR with mActions NEW Hashtable");
	}
	
	

    /**
     *
     * @param pNode
     */    
	public void initialize(Node pNode)
	{
		DocumentTraversal traversable;
		Node node;

		if(pNode.getOwnerDocument() == null)
		{
			traversable = (DocumentTraversal)pNode;
		}
		else
			traversable = (DocumentTraversal)pNode.getOwnerDocument();

		TreeWalker walker = traversable.createTreeWalker(pNode, NodeFilter.SHOW_ALL, null, false);
		
		node = walker.firstChild(); // the node is one of the action (operationdefn) or paramdefn (crop_defn) from 
			
		while(node != null)
		{
			String nodeName = node.getNodeName();
			if(nodeName.equals(XMLConstants.saction))
			{
					ActionMeta actionMeta = new ActionMeta();
					actionMeta.initialize(node);
					
					addAction(actionMeta);
			}
			
			node = walker.nextSibling();
		} // end while(node != null)
	}
	
    /**
     *
     * @param pNode
     */    
	public void update(Node pNode)
	{
		DocumentTraversal traversable;
		Node node;

		if(pNode.getOwnerDocument() == null)
		{
			traversable = (DocumentTraversal)pNode;
		}
		else
			traversable = (DocumentTraversal)pNode.getOwnerDocument();
			
		TreeWalker walker = traversable.createTreeWalker(pNode, NodeFilter.SHOW_ALL, null, false);
		
		node = walker.firstChild(); // The node is one of the action (operationlang) or paramlang (croplang) 
																		// or categoryname (cropdisplay)
			
		while(node != null)
		{
			String nodeName = node.getNodeName();
			
			if(nodeName.equals(XMLConstants.saction))
			{
				Node identityNode = walker.firstChild();
					
				Node codeNode = walker.firstChild();
				//String codeValue = walker.firstChild().getNodeValue();
				//walker.parentNode(); // move walker to level of id/code
				String codeValue = XMLDoc.getTextData(codeNode); //getTextData return the text data of the text Child like 'P', 'O', 'G'
						
				Node idNode = walker.nextSibling();
				//String idValue = walker.firstChild().getNodeValue();
				//walker.parentNode(); // move walker to level of id/code
				String idValue = XMLDoc.getTextData(idNode);
						
				ActionMeta actionMeta = getActionMeta(new Identity((new Integer(idValue)).intValue(), codeValue));
				if(actionMeta != null){
					actionMeta.update(node); // updates the definition with all other values such as alt unit, conversion...
                                        //System.out.println("OperationMeta : update() : Action found, action id = " + idValue + " code = " + codeValue);
                                }
                                else {
					//System.out.println("Action not found, action id = " + idValue + "code = " + codeValue + " @OperationMeta:update()");
 				}
												
				walker.parentNode(); /// move one more level to identity/ actionname/ paramlang/ paramdisplay 
				walker.parentNode(); //move to the level of action
			}
						
			node = walker.nextSibling();
		} // end while(node != null)
	}

    /**
     *
     * @param pAction
     */    
	public void addAction(ActionMeta pAction)
	{
		if(mActions == null){
                    mActions = new Hashtable();
                }
		Identity identity = pAction != null ? pAction.getIdentity() : null;
		if(identity != null){                    
                    mActions.put( identity, pAction);
                }
			
	}
	
	/* Not used currently
	 */
    /**
     *
     * @param pMeta
     */    
	public void addParameterMeta(ParameterMeta pMeta) //for objects with no Action such as cropdefn.xml
	{
		if(mDefaultAction == null)
			mDefaultAction = new ActionMeta();
		
		mDefaultAction.addParameterMeta(pMeta);
	}

    /**
     *
     * @param pIdentity
     * @return
     */    
	public ActionMeta getActionMeta(Identity pIdentity)
	{
		return (ActionMeta)mActions.get(pIdentity);
	}
	
    /**
     *
     * @return
     */    
	public ActionMeta getDefaultAction()
	{
		return mDefaultAction;
	}
	
    /**
     *
     * @return
     */    
	public String getObjectName()
	{
		return mObjectName;
	}
	
    /**
     *
     * @param pParamName
     * @param pValueName
     * @return
     */    
	public String getValue(String pParamName, String pValueName)
	{
		if(pParamName.equals(XMLConstants.sobjectname)){
			return mObjectName;
                }
		
		////System.out.println("OperationObject" + "Trying to get value for col " + pColName);  	
		/* If pColName is not operation name, then its one of the parameters in one of the Actions
		 * Search all the actions until you get the first parameterwith name = pColName
		 */
		Enumeration e = mActions.elements();
		while(e.hasMoreElements())
		{
			ActionMeta actionMeta = (ActionMeta)e.nextElement();
			String value = actionMeta.get(pParamName, pValueName);
			if(value != null)
				return value;
		}
		
                return null;
	}
	
}