Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.equation / src / org / simantics / equation / solver / Solver.java

diff --git a/bundles/org.simantics.equation/src/org/simantics/equation/solver/Solver.java b/bundles/org.simantics.equation/src/org/simantics/equation/solver/Solver.java
new file mode 100644 (file)
index 0000000..d73a219
--- /dev/null
+++ b/bundles/org.simantics.equation/src/org/simantics/equation/solver/Solver.java
@@ -0,0 +1,106 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.equation.solver;\r
+\r
+import java.util.Collection;\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.equation.EquationResources;\r
+\r
+\r
+public class Solver {\r
+\r
+    private static Map<Resource,ExpressionSolver> solvers = new HashMap<Resource, ExpressionSolver>();\r
+\r
+\r
+    public static void addSolver(Resource res, ExpressionSolver solver) {\r
+        if (res == null || solver == null)\r
+            throw new NullPointerException("Expression solver must be bound to valid resource");\r
+        solvers.put(res, solver);\r
+    }\r
+\r
+    public void evaluate(ReadGraph g, Resource r) throws DatabaseException {\r
+        if (g.isInstanceOf(r, EquationResources.equationResource.Expression)) {\r
+            Collection<Resource> types = g.getTypes(r);\r
+            ExpressionSolver solver = null;\r
+\r
+            for (Resource res : types) {\r
+                solver = solvers.get(res);\r
+                if (solver != null)\r
+                    break;\r
+            }\r
+            solver.evaluate(this, g, r);\r
+        } else {\r
+            throw new IllegalArgumentException("Input is not an equation");\r
+        }\r
+    }\r
+\r
+    Map<Resource,Object> valueMap = new HashMap<Resource,Object>();\r
+\r
+    public Object getCachedValue(Resource res) {\r
+        return valueMap.get(res);\r
+    }\r
+\r
+    public void setValue(Resource res, Object o) {\r
+        valueMap.put(res, o);\r
+    }\r
+\r
+    public void clear() {\r
+        valueMap.clear();\r
+    }\r
+\r
+    public double getDoubleValue(ReadGraph g, Resource d) throws DatabaseException {\r
+        Object o = getValue(g, d);\r
+        if (o instanceof double[])\r
+            return ((double[])o)[0];\r
+        if (o instanceof float[])\r
+            return ((float[])o)[0];\r
+        if (o instanceof int[])\r
+            return ((int[])o)[0];\r
+        if (o instanceof long[])\r
+            return ((long[])o)[0];\r
+        throw new RuntimeException("Cannot cast object to double " + o + "  " + o.getClass());\r
+    }\r
+\r
+    public Object getValue(ReadGraph graph, Resource res) throws DatabaseException {\r
+        Object o = getCachedValue(res);\r
+        if (o == null) {\r
+            o = graph.getValue(res);\r
+        }\r
+        return o;\r
+    }\r
+\r
+    public void pushToGraph(WriteGraph graph) throws DatabaseException {\r
+        for (Resource r : valueMap.keySet()) {\r
+            if (graph.isInstanceOf(r, EquationResources.builtins.Literal)) {\r
+                Object value = valueMap.get(r);\r
+                if (value instanceof boolean[] ||\r
+                        value instanceof byte[] ||\r
+                        value instanceof int[] ||\r
+                        value instanceof long[] ||\r
+                        value instanceof float[] ||\r
+                        value instanceof double[] ||\r
+                        value instanceof String[])\r
+                    graph.claimValue(r, value);\r
+                else {\r
+                    throw new RuntimeException("Internal error, unknown datatype " + value.getClass());\r
+                }\r
+            }\r
+        }\r
+    }\r
+\r
+}\r