tim@337: package de.intevation.gnv.transition;
tim@337: 
tim@337: import java.util.Iterator;
tim@337: 
tim@337: import org.apache.log4j.Logger;
sascha@779: import org.w3c.dom.Node;
tim@337: 
tim@824: import de.intevation.artifactdatabase.Config;
tim@824: import de.intevation.gnv.state.InputData;
tim@824: import de.intevation.gnv.state.State;
tim@824: import de.intevation.gnv.state.exception.StateException;
tim@824: 
tim@337: /**
tim@824:  * Class which supports the possibility to validate if a
tim@824:  * Transition could be done using simple Valuecompare Operations.
tim@824:  * At this Time equal and notequal-operations are supported.
tim@824:  * The Comparation is casesensitive.
sascha@780:  * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
tim@337:  *
tim@337:  */
tim@337: public class ValueCompareTransition extends TransitionBase {
tim@337: 
tim@337:     /**
tim@337:      * the logger, used to log exceptions and additonaly information
tim@337:      */
tim@337:     private static Logger log = Logger.getLogger(ValueCompareTransition.class);
tim@337:     /**
tim@337:      * The UID of this Class.
tim@337:      */
tim@337:     private static final long serialVersionUID = -7846722158776823205L;
tim@337: 
tim@337:     /**
tim@824:      * The Name of the Datafield the Value  that should be compared 
tim@824:      * should be fetched from.
tim@824:      */
tim@824:     private String dataName = null;
tim@824:     /**
tim@824:      * The Value that should be set to the State.
tim@824:      */
tim@824:     private String dataValue = null;
tim@824:     /**
tim@824:      * The Operation that should be used (equal notequal)
tim@824:      */
tim@824:     private String operator = null;
tim@824: 
tim@824: 
tim@824:     /**
tim@337:      * Constructor
tim@337:      */
tim@337:     public ValueCompareTransition() {
tim@337:         super();
tim@337:     }
tim@337: 
tim@824:     /**
tim@824:      * validates if a Transition is valid and could be used using simple
tim@824:      * Comparevalue-Operations.
tim@824:      * @see de.intevation.gnv.transition.Transition#isValid(de.intevation.gnv.state.State)
tim@824:      */
tim@337:     public boolean isValid(State state) {
sascha@778: 
tim@337:         try {
tim@337:             Iterator<InputData> it = state.getInputData().iterator();
tim@337:             while (it.hasNext()){
tim@337:                 InputData inputData = it.next();
tim@337:                 if (inputData.getName().equals(this.dataName)){
tim@337:                     boolean returnValue = false;
tim@337:                     if (operator.equals("equal")){
tim@337:                         returnValue = this.dataValue.equals(inputData.getValue());
tim@337:                     }else if (operator.equals("notequal")){
tim@337:                         returnValue = !this.dataValue.equals(inputData.getValue());
tim@337:                     }
tim@337:                     return returnValue;
tim@337:                 }
tim@337:             }
tim@337:             if (operator.equals("notequal")){
tim@337:                 // data is not given. So the constraint not Equals is fullfilled.
tim@337:                 return true;
tim@337:             }
tim@337:         } catch (StateException e) {
tim@337:             log.error(e,e);
tim@337:             return false;
tim@337:         }
tim@337:         return false;
tim@337:     }
tim@337: 
ingo@813:     
tim@337:     @Override
tim@337:     public void setup(Node configuration) {
tim@337:         super.setup(configuration);
tim@337:         this.dataName = Config.getStringXPath(configuration,"condition/@inputvalue");
tim@337:         this.dataValue = Config.getStringXPath(configuration,"condition/@value");
tim@337:         this.operator = Config.getStringXPath(configuration,"condition/@operator");
tim@337:     }
tim@337: }
ingo@813: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :