X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.equation%2Fsrc%2Forg%2Fsimantics%2Fequation%2Fext%2FElementExpressionSolver.java;fp=bundles%2Forg.simantics.equation%2Fsrc%2Forg%2Fsimantics%2Fequation%2Fext%2FElementExpressionSolver.java;h=05d842f6ebee9d3ee5858a3128a70e75a3ff6e5e;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.equation/src/org/simantics/equation/ext/ElementExpressionSolver.java b/bundles/org.simantics.equation/src/org/simantics/equation/ext/ElementExpressionSolver.java
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+++ b/bundles/org.simantics.equation/src/org/simantics/equation/ext/ElementExpressionSolver.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.equation.ext;
+
+import java.util.Iterator;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.utils.NameUtils;
+import org.simantics.db.common.utils.OrderedSetUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.equation.EquationResources;
+import org.simantics.equation.solver.ExpressionSolver;
+import org.simantics.equation.solver.Solver;
+
+public class ElementExpressionSolver implements ExpressionSolver {
+	
+	private Oper sum = new Sum();
+	private Oper sub = new Sub();
+	private Oper mul = new Mul();
+	private Oper div = new Div();
+	
+	@Override
+	public void evaluate(Solver solver, ReadGraph g, Resource t) throws DatabaseException {
+		Iterator<Resource> it = OrderedSetUtils.iterator(g, t.get());
+		double res = getNumber(solver, g, it.next());
+		while (it.hasNext()) {
+			Oper op = getOperator(g, it.next());
+			double v = getNumber(solver, g, it.next());
+			res = op.evaluate(res, v);
+		}
+		
+		solver.setValue(g.getSingleObject(t, EquationResources.equationResource.HasTarget), new double[]{res});
+	}
+	
+	private double getNumber(Solver solver, ReadGraph g, Resource number) throws DatabaseException {
+		// TODO : assumes that HasVariable points to Double while it can point to any Property
+		return solver.getDoubleValue(g, g.getSingleObject(number, EquationResources.equationResource.HasVariable));
+	}
+	
+	private Oper getOperator(ReadGraph g, Resource operator) throws DatabaseException {
+		if (operator.get().equals(EquationResources.equationResource.Addition))
+			return sum;
+		else if (operator.get().equals(EquationResources.equationResource.Subtraction))
+			return sub;
+		else if (operator.get().equals(EquationResources.equationResource.Multiplication))
+			return mul;
+		else if (operator.get().equals(EquationResources.equationResource.Division))
+			return div;
+		throw new RuntimeException("Unknown operation " + NameUtils.getSafeName(g, operator));
+		
+	}
+	
+	private interface Oper {
+		double evaluate(double d1, double d2);
+	}
+	
+	private class Sum implements Oper {
+		@Override
+		public double evaluate(double d1, double d2) {
+			return d1 + d2;
+		}
+	}
+	
+	private class Sub implements Oper {
+		@Override
+		public double evaluate(double d1, double d2) {
+			return d1 - d2;
+		}
+	}
+	
+	private class Mul implements Oper {
+		@Override
+		public double evaluate(double d1, double d2) {
+			return d1 * d2;
+		}
+	}
+	
+	private class Div implements Oper {
+		@Override
+		public double evaluate(double d1, double d2) {
+			return d1 / d2;
+		}
+	}
+	
+	
+
+}