--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/MapArtifact.java	Fri Jan 06 10:11:48 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/MapArtifact.java	Fri Jan 06 12:02:10 2012 +0000
@@ -5,27 +5,34 @@
 import java.util.List;
 
 import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
 
 import de.intevation.artifacts.ArtifactFactory;
 import de.intevation.artifacts.CallMeta;
 import de.intevation.artifacts.CallContext;
 
-import de.intevation.artifactdatabase.state.DefaultOutput;
+import de.intevation.artifacts.common.utils.XMLUtils;
+import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
+import de.intevation.artifacts.common.ArtifactNamespaceContext;
+
+import de.intevation.artifactdatabase.ProtocolUtils;
 import de.intevation.artifactdatabase.state.Facet;
 import de.intevation.artifactdatabase.state.State;
-
-import de.intevation.flys.artifacts.model.WMSDBLayerFacet;
+import de.intevation.artifactdatabase.state.StateEngine;
+import de.intevation.artifactdatabase.state.Output;
+import de.intevation.artifactdatabase.transition.TransitionEngine;
 
 import de.intevation.flys.model.River;
+import de.intevation.flys.utils.FLYSUtils;
 
-import de.intevation.flys.artifacts.model.FacetTypes;
-import de.intevation.flys.artifacts.model.RiverFactory;
-import de.intevation.flys.artifacts.resources.Resources;
-import de.intevation.flys.utils.FLYSUtils;
-import de.intevation.flys.utils.GeometryUtils;
+import de.intevation.flys.artifacts.RiverAxisArtifact.RiverAxisState;
+import de.intevation.flys.artifacts.states.DefaultState;
+import de.intevation.flys.artifacts.context.FLYSContext;
+import de.intevation.flys.artifacts.model.WMSDBLayerFacet;
 
 
-public class MapArtifact extends RiverAxisArtifact {
+public class MapArtifact extends FLYSArtifact {
 
     private static final Logger logger =
         Logger.getLogger(MapArtifact.class);
@@ -40,64 +47,226 @@
     {
         logger.debug("MapArtifact.setup");
         this.identifier = identifier;
-    }
-
-    @Override
-    public State getCurrentState(Object cc) {
-        logger.debug("MapArtifact.getCurrentState");
-
-        State state = new MapState(this);
-        List<Facet> fs = facets.get(getCurrentStateId());
+        name = "map";
 
-        DefaultOutput o = new DefaultOutput(
-            "floodmap",
-            "floodmap",
-            "image/png",
-            fs,
-            "map");
+        FLYSContext flysContext = FLYSUtils.getFlysContext(context);
 
-        state.getOutputs().add(o);
+        List<State> states = getStates(context);
 
-        return state;
+        setCurrentState(states.get(0));
     }
 
 
     @Override
-    public String getCurrentStateId() {
-        return "state.map.new";
+    public Document describe(Document data, CallContext context) {
+        logger.debug("Describe: the current state is: " + getCurrentStateId());
+
+        if (logger.isDebugEnabled()) {
+            dumpArtifact();
+        }
+
+        FLYSContext flysContext = FLYSUtils.getFlysContext(context);
+
+        StateEngine stateEngine = (StateEngine) flysContext.get(
+            FLYSContext.STATE_ENGINE_KEY);
+
+        TransitionEngine transitionEngine = (TransitionEngine) flysContext.get(
+            FLYSContext.TRANSITION_ENGINE_KEY);
+
+        List<State> reachable = transitionEngine.getReachableStates(
+            this, getCurrentState(context), stateEngine);
+
+        Document description            = XMLUtils.newDocument();
+        XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
+            description,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element root = ProtocolUtils.createRootNode(creator);
+        description.appendChild(root);
+
+        State current = getCurrentState(context);
+
+        ProtocolUtils.appendDescribeHeader(creator, root, identifier(), hash());
+        ProtocolUtils.appendState(creator, root, current);
+        ProtocolUtils.appendReachableStates(creator, root, reachable);
+
+        appendBackgroundActivity(creator, root, context);
+
+        Element name = ProtocolUtils.createArtNode(
+            creator, "name",
+            new String[] { "value" },
+            new String[] { getName() });
+
+        Element ui = ProtocolUtils.createArtNode(
+            creator, "ui", null, null);
+
+        Element staticUI  = ProtocolUtils.createArtNode(
+            creator, "static", null, null);
+
+        Element outs = ProtocolUtils.createArtNode(
+            creator, "outputmodes", null, null);
+        appendOutputModes(description, outs, context, identifier());
+
+        appendStaticUI(description, staticUI, context, identifier());
+
+        Element dynamic = current.describe(
+            this,
+            description,
+            root,
+            context,
+            identifier());
+
+        if (dynamic != null) {
+            ui.appendChild(dynamic);
+        }
+
+        ui.appendChild(staticUI);
+
+        root.appendChild(name);
+        root.appendChild(ui);
+        root.appendChild(outs);
+
+        return description;
+
+    }
+
+
+    protected static void appendBackgroundActivity(
+        ElementCreator cr,
+        Element        root,
+        CallContext    context
+    ) {
+        Element inBackground = cr.create("background-processing");
+        root.appendChild(inBackground);
+
+        cr.addAttr(
+            inBackground,
+            "value",
+            String.valueOf(context.isInBackground()),
+            true);
+    }
+
+
+    /**
+     * Append output mode nodes to a document.
+     */
+    protected void appendOutputModes(
+        Document    doc,
+        Element     outs,
+        CallContext context,
+        String      uuid)
+    {
+        List<String> stateIds = getPreviousStateIds();
+
+        XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        FLYSContext flysContext = FLYSUtils.getFlysContext(context);
+        StateEngine engine      = (StateEngine) flysContext.get(
+            FLYSContext.STATE_ENGINE_KEY);
+
+        for (String stateId: stateIds) {
+            logger.debug("Append output modes for state: " + stateId);
+            DefaultState state = (DefaultState) engine.getState(stateId);
+
+            List<Output> list = state.getOutputs();
+            if (list == null || list.size() == 0) {
+                logger.debug("-> No output modes for this state.");
+                continue;
+            }
+
+            List<Facet> fs = facets.get(stateId);
+
+            if (fs == null || fs.size() == 0) {
+                logger.debug("No facets for previous state found.");
+                continue;
+            }
+
+            logger.debug("Found " + fs.size() + " facets in previous states.");
+
+            List<Output> generated = generateOutputs(list, fs);
+
+            ProtocolUtils.appendOutputModes(doc, outs, generated);
+        }
+
+        try {
+            DefaultState cur = (DefaultState) getCurrentState(context);
+            if (cur.validate(this)) {
+                List<Output> list = cur.getOutputs();
+                if (list != null && list.size() > 0) {
+                    logger.debug(
+                        "Append output modes for current state: " + cur.getID());
+
+                    List<Facet> fs = facets.get(cur.getID());
+
+                    if (fs != null && fs.size() > 0) {
+                        List<Output> generated = generateOutputs(list, fs);
+
+                        logger.debug("Found " + fs.size() + " current facets.");
+                        if (!generated.isEmpty()) {
+                            ProtocolUtils.appendOutputModes(
+                                doc, outs, generated);
+                        }
+                    }
+                    else {
+                        logger.debug("No facets found for the current state.");
+                    }
+                }
+            }
+        }
+        catch (IllegalArgumentException iae) {
+            // state is not valid, so we do not append its outputs.
+        }
+    }
+
+
+    /**
+     * This method appends the static data - that has already been inserted by
+     * the user - to the static node of the DESCRIBE document.
+     *
+     * @param doc The document.
+     * @param ui The root node.
+     * @param context The CallContext.
+     * @param uuid The identifier of the artifact.
+     */
+    protected void appendStaticUI(
+        Document    doc,
+        Node        ui,
+        CallContext context,
+        String uuid)
+    {
+        List<String> stateIds = getPreviousStateIds();
+
+        logger.debug("previous states: " + stateIds);
+        FLYSContext flysContext = FLYSUtils.getFlysContext(context);
+        StateEngine engine      = (StateEngine) flysContext.get(
+            FLYSContext.STATE_ENGINE_KEY);
+
+        for (String stateId: stateIds) {
+            logger.debug("Append static data for state: " + stateId);
+            DefaultState state = (DefaultState) engine.getState(stateId);
+
+            ui.appendChild(state.describeStatic(this, doc, ui, context, uuid));
+        }
     }
 
 
     public static class MapState extends RiverAxisState {
 
-        public MapState() {
-        }
-
-        public MapState(MapArtifact artifact) {
-            super(artifact);
-            this.id = "state.map.new";
-        }
-
         @Override
-        public Object computeInit(
-            FLYSArtifact artifact,
-            String       hash,
-            Object       context,
-            CallMeta     meta,
-            List<Facet>  facets)
-        {
-            return null;
-        }
-
-        @Override
-        public Object computeFeed(
+        public Object computeAdvance(
             FLYSArtifact artifact,
             String       hash,
             CallContext  context,
             List<Facet>  facets,
             Object       old)
         {
-            logger.debug("MapState.computeFeed");
+            logger.debug("MapState.computeAdvance");
+
+            this.artifact = artifact;
 
             String type = getFacetType();
 
@@ -105,7 +274,7 @@
                 0,
                 type,
                 getTitle(context.getMeta()),
-                ComputeType.FEED,
+                ComputeType.ADVANCE,
                 getID(), hash,
                 getUrl());