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

import java.util.HashMap;
import java.util.Map;

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.artifactdatabase.DefaultArtifact;
import de.intevation.gnv.artifacts.context.GNVArtifactContext;
import de.intevation.gnv.transition.Transition;
import de.intevation.gnv.transition.TransitionFactory;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 *
 */
public abstract class GNVArtifactBase extends DefaultArtifact {
    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(GNVArtifactBase.class);
    /**
     * The UID of this Class
     */
    private static final long serialVersionUID = -8907096744400741458L;
    
    public static final String XPATH_IDENTIFIER_REPLACE = "IDENTIFIER";
    /**
     * The XPATH to the XML-Fragment that should be used for the Configuration
     */
    public static final String XPATH_ARTIFACT_CONFIGURATION= "/artifact-database/artifacts/artifact[@name='"+XPATH_IDENTIFIER_REPLACE+"']";
    
    protected Transition current = null;
    
    protected Map<String, Transition> transitions = null;

    protected String name = null;
    /**
     * Constructor
     */
    public GNVArtifactBase() {
        super();
    }
    
    protected Node getConfigurationFragment(Document document){
        log.debug("GNVArtifactBase.getConfigurationFragment");
        String xpathQuery = XPATH_ARTIFACT_CONFIGURATION.replaceAll(XPATH_IDENTIFIER_REPLACE, this.name);
        log.debug(xpathQuery);
        return Config.getNodeXPath(document,xpathQuery);
        
    }
    
    /**
     * @see de.intevation.artifactdatabase.DefaultArtifact#setup(java.lang.String, java.lang.Object)
     */
    @Override
    public void setup(String identifier, Object context) {
        log.debug("GNVArtifactBase.setup");
        super.setup(identifier, context);
        if (context instanceof GNVArtifactContext){
            GNVArtifactContext gnvContext = (GNVArtifactContext)context;
            Document doc = gnvContext.getConfig();
            Node artifactNode = this.getConfigurationFragment(doc);
            NodeList transitionList = Config.getNodeSetXPath(artifactNode, "transitions/transition");
            this.transitions = new HashMap<String, Transition>(transitionList.getLength());
            for (int i  = 0 ; i < transitionList.getLength(); i++){
                Transition tmpTransition = TransitionFactory.getInstance().createTransition(transitionList.item(i));
                if (tmpTransition != null){
                    this.transitions.put(tmpTransition.getID(), tmpTransition);
                    if (this.current == null){
                        this.current = tmpTransition;
                    }
                }
            }
            
        }
    }
    

}