ingo@106: package de.intevation.flys.artifacts.transitions;
ingo@106: 
ingo@106: import java.util.HashMap;
ingo@106: import java.util.List;
ingo@106: import java.util.Map;
ingo@106: 
ingo@106: import org.apache.log4j.Logger;
ingo@106: 
ingo@106: /**
ingo@106:  * The TransitionEngine stores all transitions for each Artifact and should be
ingo@106:  * used to determine, if an Artifact is able to advance from one to another
ingo@106:  * state.
ingo@106:  *
ingo@106:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@106:  */
ingo@106: public class TransitionEngine {
ingo@106: 
ingo@106:     /** The logger used in this class. */
ingo@106:     private static Logger logger = Logger.getLogger(TransitionEngine.class);
ingo@106: 
ingo@106:     /**
ingo@106:      * A map that contains the transitions of the artifacts. The key is the name
ingo@106:      * of the artifact, its value is a list of all transitions of this artifact.
ingo@106:      */
ingo@106:     protected Map<String, List> transitions;
ingo@106: 
ingo@106: 
ingo@106:     /**
ingo@106:      * The default constructor.
ingo@106:      */
ingo@106:     public TransitionEngine() {
ingo@106:         transitions = new HashMap<String, List>();
ingo@106:     }
ingo@106: 
ingo@106: 
ingo@106:     /**
ingo@106:      * Add new transitions for a specific artifact.
ingo@106:      *
ingo@106:      * @param artifact the name of the Artifact.
ingo@106:      * @param transitions the list of transition of the artifact.
ingo@106:      *
ingo@106:      * @return true, if the transitions were added, otherwise false.
ingo@106:      */
ingo@106:     public boolean addTransition(String artifact, List transitions) {
ingo@106:         List tmp = this.transitions.get(artifact);
ingo@106: 
ingo@106:         if (tmp != null) {
ingo@106:             logger.info(
ingo@106:                 "Transitions for the artifact '"
ingo@106:                 + artifact
ingo@106:                 + "' already stored.");
ingo@106: 
ingo@106:             return false;
ingo@106:         }
ingo@106: 
ingo@106:         logger.debug("Add new transitions for artifact '" + artifact + "'");
ingo@106:         return this.transitions.put(artifact, transitions) != null;
ingo@106:     }
ingo@106: }
ingo@106: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :