1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.equation.solver;
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14 import java.util.Collection;
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15 import java.util.HashMap;
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16 import java.util.Map;
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18 import org.simantics.db.ReadGraph;
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19 import org.simantics.db.Resource;
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20 import org.simantics.db.WriteGraph;
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21 import org.simantics.db.exception.DatabaseException;
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22 import org.simantics.equation.EquationResources;
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25 public class Solver {
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27 private static Map<Resource,ExpressionSolver> solvers = new HashMap<Resource, ExpressionSolver>();
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30 public static void addSolver(Resource res, ExpressionSolver solver) {
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31 if (res == null || solver == null)
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32 throw new NullPointerException("Expression solver must be bound to valid resource");
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33 solvers.put(res, solver);
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36 public void evaluate(ReadGraph g, Resource r) throws DatabaseException {
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37 if (g.isInstanceOf(r, EquationResources.equationResource.Expression)) {
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38 Collection<Resource> types = g.getTypes(r);
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39 ExpressionSolver solver = null;
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41 for (Resource res : types) {
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42 solver = solvers.get(res);
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46 solver.evaluate(this, g, r);
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48 throw new IllegalArgumentException("Input is not an equation");
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52 Map<Resource,Object> valueMap = new HashMap<Resource,Object>();
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54 public Object getCachedValue(Resource res) {
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55 return valueMap.get(res);
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58 public void setValue(Resource res, Object o) {
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59 valueMap.put(res, o);
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62 public void clear() {
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66 public double getDoubleValue(ReadGraph g, Resource d) throws DatabaseException {
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67 Object o = getValue(g, d);
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68 if (o instanceof double[])
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69 return ((double[])o)[0];
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70 if (o instanceof float[])
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71 return ((float[])o)[0];
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72 if (o instanceof int[])
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73 return ((int[])o)[0];
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74 if (o instanceof long[])
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75 return ((long[])o)[0];
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76 throw new RuntimeException("Cannot cast object to double " + o + " " + o.getClass());
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79 public Object getValue(ReadGraph graph, Resource res) throws DatabaseException {
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80 Object o = getCachedValue(res);
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82 o = graph.getValue(res);
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87 public void pushToGraph(WriteGraph graph) throws DatabaseException {
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88 for (Resource r : valueMap.keySet()) {
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89 if (graph.isInstanceOf(r, EquationResources.builtins.Literal)) {
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90 Object value = valueMap.get(r);
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91 if (value instanceof boolean[] ||
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92 value instanceof byte[] ||
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93 value instanceof int[] ||
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94 value instanceof long[] ||
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95 value instanceof float[] ||
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96 value instanceof double[] ||
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97 value instanceof String[])
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98 graph.claimValue(r, value);
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100 throw new RuntimeException("Internal error, unknown datatype " + value.getClass());
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