--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/Calculation.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,167 @@
+package org.dive4elements.river.artifacts.model;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+import java.io.Serializable;
+
+import org.dive4elements.artifacts.CallMeta;
+
+import org.dive4elements.river.artifacts.resources.Resources;
+
+import org.dive4elements.river.utils.Formatter;
+
+/** A calculation that can have result and problems. */
+public class Calculation
+implements   Serializable
+{
+    /** Problem of a calculation.
+     * Has location and message. */
+    public static class Problem
+    implements          Serializable
+    {
+        protected Double    km;
+        protected String    msg;
+        protected Object [] args;
+
+        public Problem() {
+        }
+
+        public Problem(String msg) {
+            this.msg = msg;
+        }
+
+        public Problem(String msg, Object [] args) {
+            this.msg  = msg;
+            this.args = args;
+        }
+
+        public Problem(double km, String msg) {
+            this.km  = km;
+            this.msg = msg;
+        }
+
+        public Problem(double km, String msg, Object [] args) {
+            this.km   = km;
+            this.msg  = msg;
+            this.args = args;
+        }
+
+        public Element toXML(Document document, CallMeta meta) {
+            Element problem = document.createElement("problem");
+            if (km != null) {
+                problem.setAttribute(
+                    "km",
+                    Formatter.getCalculationKm(meta).format(km));
+            }
+            String text = args != null
+                ? Resources.getMsg(meta, msg, msg, args)
+                : Resources.getMsg(meta, msg, msg);
+            problem.setTextContent(text);
+            return problem;
+        }
+
+        public String getMsg() {
+            return msg;
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            if (!(other instanceof Problem)) {
+                return false;
+            }
+            Problem o = (Problem)other;
+            return !(!msg.equals(o.msg)
+                || (km == null && o.km != null)
+                || (km != null && o.km == null)
+                || (km != null && !km.equals(o.km))
+                || !Arrays.equals(args, o.args));
+        }
+    } // class Problem
+
+    protected List<Problem> problems;
+
+    public Calculation() {
+    }
+
+    public Calculation(String msg) {
+        addProblem(msg);
+    }
+
+    /** New Calculation with error which can be translated given args. */
+    public Calculation(String msg, Object ... args) {
+        addProblem(msg, args);
+    }
+
+    protected List<Problem> checkProblems() {
+        if (problems == null) {
+            problems = new ArrayList<Problem>();
+        }
+        return problems;
+    }
+
+    public void addProblems(Calculation other) {
+        List<Problem> otherProblems = other.problems;
+        if (otherProblems != null) {
+            List<Problem> problems = checkProblems();
+            for (Problem problem: otherProblems) {
+                if (!problems.contains(problem)) {
+                    problems.add(problem);
+                }
+            }
+        }
+    }
+
+    public void addProblem(Problem problem) {
+        List<Problem> problems = checkProblems();
+        if (!problems.contains(problem)) {
+            problems.add(problem);
+        }
+    }
+
+    public void addProblem(String msg) {
+        addProblem(new Problem(msg));
+    }
+
+    public void addProblem(String msg, Object ... args) {
+        addProblem(new Problem(msg, args));
+    }
+
+    public void addProblem(double km, String msg) {
+        addProblem(new Problem(km, msg));
+    }
+
+    public void addProblem(double km, String msg, Object ... args) {
+        addProblem(new Problem(km, msg, args));
+    }
+
+    public boolean hasProblems() {
+        return problems != null && !problems.isEmpty();
+    }
+
+    public int numProblems() {
+        return problems != null ? problems.size() : 0;
+    }
+
+    public List<Problem> getProblems() {
+        return problems;
+    }
+
+    public void toXML(Document document, CallMeta meta) {
+
+        Element root = document.createElement("problems");
+
+        if (hasProblems()) {
+            for (Problem problem: problems) {
+                root.appendChild(problem.toXML(document, meta));
+            }
+        }
+
+        document.appendChild(root);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :