/**
 *
 */
package de.intevation.gnv.transition;

import java.util.ArrayList;
import java.util.Collection;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import de.intevation.artifactdatabase.Config;
import de.intevation.gnv.artifacts.GNVArtifactBase;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 *
 */
public abstract class TransitionBase implements Transition {
    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(GNVArtifactBase.class);
    
    private String id = null;
    
    private String description = null;
    


    protected String queryID = null;
    
    private Collection<String> reachableTransitions = null;
    
    private Collection<InputValue> inputValues = null;
    
    private Transition parent = null;
    /**
     * Constructor
     */
    public TransitionBase() {
        super();
    }

    /**
     * @see de.intevation.gnv.transition.Transition#getID()
     */
    public String getID() {
        return this.id;
    }
    
    /**
     * @see de.intevation.gnv.transition.Transition#getDescription()
     */
    public String getDescription() {
        return this.description;
    }
    
    /**
     * @see de.intevation.gnv.transition.Transition#reachableTransitions()
     */
    public Collection<String> reachableTransitions() {
        return this.reachableTransitions;
    }

    /**
     * @see de.intevation.gnv.transition.Transition#getRequiredInputValues()
     */
    public Collection<InputValue> getRequiredInputValues() {
        return this.inputValues;
    }

    /**
     * @see de.intevation.gnv.transition.Transition#setup(org.w3c.dom.Node)
     */
    public void setup(Node configuration) {
        
        this.id = Config.getStringXPath(configuration,"@id");
        this.description = Config.getStringXPath(configuration,"@description");
        
        log.info("Transition-ID = "+ this.id);
        NodeList nodes = Config.getNodeSetXPath(configuration,"reachableTransitions/transition");
        this.reachableTransitions = new ArrayList<String>(nodes.getLength());
        for (int i = 0 ; i < nodes.getLength(); i++){
            String reachableTransition = nodes.item(i).getTextContent();
            log.info("ReachableTransition ==> "+ reachableTransition);
            this.reachableTransitions.add(reachableTransition);
            
        }
        
        NodeList inputValuesNodes = Config.getNodeSetXPath(configuration,"inputvalues/inputvalue");
        this.inputValues = new ArrayList<InputValue>(inputValuesNodes.getLength());
        for (int i = 0 ; i < inputValuesNodes.getLength(); i++){
            Node inputValueNode = inputValuesNodes.item(i);
            InputValue inputValue = new DefaultInputValue(Config.getStringXPath(inputValueNode,"@name"), Config.getStringXPath(inputValueNode,"@type"));
            log.debug(inputValue.toString());
            this.inputValues.add(inputValue);
        }
        
        this.queryID = Config.getStringXPath(configuration,"queryID");
        log.info("QueryID ==>"+ this.queryID);
        
    }

    /**
     * @see de.intevation.gnv.transition.Transition#getParent()
     */
    public Transition getParent() {
        return this.parent;
    }

    /**
     * @see de.intevation.gnv.transition.Transition#setParent(de.intevation.gnv.transition.Transition)
     */
    public void setParent(Transition transition) {
        this.parent = transition;
    }
}