Add benchmarks

src/test/java/no/birkett/kiwi/Benchmarks.java

@@ -0,0 +1,71 @@
+package no.birkett.kiwi;
+
+import java.util.HashMap;
+
+/**
+ * Created by alex on 27/11/2014.
+ */
+public class Benchmarks {
+
+    public static void testAddingLotsOfConstraints() throws DuplicateConstraintException, UnsatisfiableConstraintException {
+        Solver solver = new Solver();
+
+        final HashMap<String, Variable> variables = new HashMap<String, Variable>();
+
+        ConstraintParser.CassowaryVariableResolver variableResolver = new ConstraintParser.CassowaryVariableResolver() {
+
+            @Override
+            public Variable resolveVariable(String variableName) {
+                Variable variable = null;
+                if (variables.containsKey(variableName)) {
+                    variable =  variables.get(variableName);
+                } else {
+                    variable = new Variable(variableName);
+                    variables.put(variableName, variable);
+                }
+                return variable;
+            }
+
+            @Override
+            public Expression resolveConstant(String name) {
+                try {
+                    return new Expression(Double.parseDouble(name));
+                } catch (NumberFormatException e) {
+                    return null;
+                }
+            }
+        };
+
+        solver.addConstraint(ConstraintParser.parseConstraint("variable0 == 100", variableResolver));
+
+        for (int i = 1; i < 3000; i++) {
+            String constraintString  = getVariableName(i) + " == 100 + " + getVariableName(i - 1);
+
+            Constraint constraint = ConstraintParser.parseConstraint(constraintString, variableResolver);
+
+            System.gc();
+            long timeBefore = System.nanoTime();
+
+            solver.addConstraint(constraint);
+
+            System.out.println(i + "," + ((System.nanoTime() - timeBefore) / 1000) );
+        }
+
+
+    }
+
+    private static String getVariableName(int number) {
+        return "getVariable" + number;
+    }
+
+    public static void main(String [ ] args) {
+        try {
+            testAddingLotsOfConstraints();
+        } catch (DuplicateConstraintException e) {
+            e.printStackTrace();
+        } catch (UnsatisfiableConstraintException e) {
+            e.printStackTrace();
+        }
+    }
+
+}