--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java	Fri Sep 28 12:14:17 2012 +0200
@@ -0,0 +1,149 @@
+package de.intevation.flys.collections;
+
+import java.util.List;
+import java.util.Map;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+import de.intevation.artifacts.ArtifactNamespaceContext;
+
+import de.intevation.artifactdatabase.state.Facet;
+import de.intevation.artifactdatabase.state.Output;
+
+import de.intevation.artifacts.common.utils.XMLUtils;
+import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
+
+import de.intevation.flys.artifacts.model.ManagedFacet;
+
+
+public class AttributeWriter {
+
+    protected Map<String, Output> oldAttr;
+    protected Map<String, Output> newAttr;
+
+    private static Logger logger = Logger.getLogger(AttributeWriter.class);
+
+
+    public AttributeWriter(
+        Map<String, Output> oldAttr,
+        Map<String, Output> newAttr)
+    {
+        this.oldAttr = oldAttr;
+        this.newAttr = newAttr;
+    }
+
+
+    protected Document write() {
+        Document doc = XMLUtils.newDocument();
+
+        ElementCreator cr = new ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element attribute = cr.create("attribute");
+        Element outs      = cr.create("outputs");
+
+        attribute.appendChild(outs);
+        doc.appendChild(attribute);
+
+        for (String outName: newAttr.keySet()) {
+
+            Output a = newAttr.get(outName);
+            Output b = oldAttr.get(outName);
+
+            writeOutput(doc, outs, cr, a, b);
+        }
+
+        return doc;
+    }
+
+
+    protected void writeOutput(
+        Document       doc,
+        Node           outs,
+        ElementCreator cr,
+        Output         a, /* new output */
+        Output         b) /* old output */
+    {
+        Element output = cr.create("output");
+        cr.addAttr(output, "name", a.getName());
+
+        outs.appendChild(output);
+
+        List<Facet> facetsA = a.getFacets();
+        List<Facet> facetsB = null;
+
+        if (b != null) {
+            facetsB = b.getFacets();
+        }
+
+        writeFacets(doc, cr, output, facetsA, facetsB);
+    }
+
+
+    protected void writeFacets(
+        Document       doc,
+        ElementCreator cr,
+        Element        output,
+        List<Facet>    a, /* new facets */
+        List<Facet>    b) /* old facets */
+    {
+        int num = a.size();
+
+        for (int i = 0; i < num; i++) {
+            ManagedFacet fA = (ManagedFacet) a.get(i);
+
+            if (!mergeFacets(doc, cr, output, fA, b)) {
+                Node n = fA.toXML(doc);
+
+                if (n != null) {
+                    output.appendChild(n);
+                }
+            }
+        }
+    }
+
+
+    protected boolean mergeFacets(
+        Document       doc,
+        ElementCreator cr,
+        Element        output,
+        ManagedFacet   a,    /* new facets */
+        List<Facet>    list) /* old facets */
+    {
+        String nameA = a.getName() + a.getIndex();
+
+        if (list == null) {
+            logger.debug("No old facets found.");
+            return false;
+        }
+
+        for (Facet facet: list) {
+            String nameB = facet.getName() + facet.getIndex();
+
+            if (nameA.equals(nameB)) {
+                ManagedFacet b = (ManagedFacet) facet;
+
+                if (!b.getArtifact().equals(a.getArtifact())) {
+                    continue;
+                }
+
+                Node n = facet.toXML(doc);
+
+                if (n != null) {
+                    output.appendChild(n);
+                }
+
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :