--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/states/StateFactory.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,122 @@
+package org.dive4elements.river.artifacts.states;
+
+import javax.xml.xpath.XPathConstants;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import org.dive4elements.artifactdatabase.data.DefaultStateData;
+import org.dive4elements.artifactdatabase.state.State;
+
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class StateFactory {
+
+    /** The logger used in this class */
+    private static Logger logger = Logger.getLogger(StateFactory.class);
+
+    /** The XPath to the classname of the state */
+    public static final String XPATH_STATE = "@state";
+
+    /** The XPath to the data items of the state relative to the state node. */
+    public static final String XPATH_DATA = "data";
+
+    /** The XPath to the data name relative to the data node.*/
+    public static final String XPATH_DATA_NAME = "@name";
+
+    /** The XPath to the data type relative to the data node.*/
+    public static final String XPATH_DATA_TYPE = "@type";
+
+    /** The XPath to the data description relative to the data node.*/
+    public static final String XPATH_DATA_DESCRIPTION = "@description";
+
+
+    /**
+     * Creates a new State based on the configured class provided by
+     * <code>stateConf</code>.
+     *
+     * @param stateConf The configuration of the state.
+     *
+     * @return a State.
+     */
+    public static State createState(Node stateConf) {
+        String clazz = (String) XMLUtils.xpath(
+            stateConf, XPATH_STATE, XPathConstants.STRING);
+
+        State state = null;
+
+        try {
+            logger.debug("Create a new State for class: " + clazz);
+            state = (State) Class.forName(clazz).newInstance();
+            state.setup(stateConf);
+
+            initializeStateData(state, stateConf);
+        }
+        catch (InstantiationException ie) {
+            logger.error(ie, ie);
+        }
+        catch (IllegalAccessException iae) {
+            logger.error(iae, iae);
+        }
+        catch (ClassNotFoundException cnfe) {
+            logger.error(cnfe, cnfe);
+        }
+
+        return state;
+    }
+
+
+    /**
+     * This method extracts the configured input data of a state and adds new
+     * StateData objects to the State.
+     *
+     * @param state The state.
+     * @param stateConf The state configuration node.
+     */
+    protected static void initializeStateData(State state, Node stateConf) {
+        NodeList dataList = (NodeList) XMLUtils.xpath(
+            stateConf, XPATH_DATA, XPathConstants.NODESET);
+
+        if (dataList == null || dataList.getLength() == 0) {
+            logger.debug("The state has no input data configured.");
+
+            return;
+        }
+
+        int items = dataList.getLength();
+
+        logger.debug("The state has " + items + " data items configured.");
+
+        for (int i = 0; i < items; i++) {
+            Node data = dataList.item(i);
+
+            String name = (String) XMLUtils.xpath(
+                data, XPATH_DATA_NAME, XPathConstants.STRING);
+            String type = (String) XMLUtils.xpath(
+                data, XPATH_DATA_TYPE, XPathConstants.STRING);
+            String desc = (String) XMLUtils.xpath(
+                data, XPATH_DATA_DESCRIPTION, XPathConstants.STRING);
+
+            if (name == null || name.length() == 0) {
+                logger.warn("No name for data item at pos " + i + " found.");
+                continue;
+            }
+
+            if (type == null || type.length() == 0) {
+                logger.warn("No type for data item at pos " + i + " found.");
+                logger.warn("Default type 'string' used.");
+                type = "string";
+            }
+
+            logger.debug("add StateData '" + name + "' (type '" + type + "')");
+            state.addData(name, new DefaultStateData(name, desc, type));
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :