1 files changed, 71 insertions, 0 deletions

diff --git a/Solvers/ILP-Solver/hu.bme.mit.inf.dslreasoner.ilp.cbc/src/hu/bme/mit/inf/dslreasoner/ilp/cbc/CbcSolver.java b/Solvers/ILP-Solver/hu.bme.mit.inf.dslreasoner.ilp.cbc/src/hu/bme/mit/inf/dslreasoner/ilp/cbc/CbcSolver.java
new file mode 100644
index 00000000..085d4448
--- /dev/null
+++ b/Solvers/ILP-Solver/hu.bme.mit.inf.dslreasoner.ilp.cbc/src/hu/bme/mit/inf/dslreasoner/ilp/cbc/CbcSolver.java
@@ -0,0 +1,71 @@
+package hu.bme.mit.inf.dslreasoner.ilp.cbc;
+
+public class CbcSolver {
+        private static int CBC_SOLUTION_BOUNDED = 0;
+        private static int CBC_SOLUTION_UNBOUNDED = 1;
+        private static int CBC_UNSAT = 2;
+        private static int CBC_ABANDONED = 3;
+        private static int CBC_TIMEOUT = 4;
+        private static int CBC_ERROR = 5;
+
+        private static boolean nativesLoaded = false;
+
+        private CbcSolver() {
+                throw new IllegalStateException("This is a static utility class and should not be instantiated directly.");
+        }
+
+        public static CbcResult solve(double[] columnLowerBounds, double[] columnUpperBounds, int[] rowStarts,
+                        int[] columnIndices, double[] entries, double[] rowLowerBounds, double[] rowUpperBounds, double[] objective,
+                        boolean lpRelaxation, double timeoutSeconds, boolean silent) {
+                loadNatives();
+                validate(columnLowerBounds, columnUpperBounds, rowStarts, columnIndices, entries, rowLowerBounds,
+                                rowUpperBounds, objective);
+                double[] output = new double[1];
+                int result = solveIlpProblem(columnLowerBounds, columnUpperBounds, rowStarts, columnIndices, entries,
+                                rowLowerBounds, rowUpperBounds, objective, output, lpRelaxation, timeoutSeconds, silent);
+                if (result == CBC_SOLUTION_BOUNDED) {
+                        return new CbcResult.SolutionBounded(output[0]);
+                } else if (result == CBC_SOLUTION_UNBOUNDED) {
+                        return CbcResult.SOLUTION_UNBOUNDED;
+                } else if (result == CBC_UNSAT) {
+                        return CbcResult.UNSAT;
+                } else if (result == CBC_ABANDONED) {
+                        return CbcResult.ABANDONED;
+                } else if (result == CBC_TIMEOUT) {
+                        return CbcResult.TIMEOUT;
+                } else if (result == CBC_ERROR) {
+                        throw new CbcException("Solver signalled error, but no exception was thrown");
+                } else {
+                        throw new CbcException("Unknown return value: " + result);
+                }
+        }
+
+        private static void loadNatives() {
+                if (!nativesLoaded) {
+                        synchronized (CbcSolver.class) {
+                                System.loadLibrary("viatracbc");
+                                nativesLoaded = true;
+                        }
+                }
+        }
+
+        private static void validate(double[] columnLowerBounds, double[] columnUpperBounds, int[] rowStarts,
+                        int[] columnIndices, double[] entries, double[] rowLowerBounds, double[] rowUpperBounds,
+                        double[] objective) {
+                int numColumns = columnLowerBounds.length;
+                if (columnUpperBounds.length != numColumns) {
+                        throw new CbcException("Lengths of columnLowerBounds and columnUpperBounds must match");
+                }
+                if (objective.length != numColumns) {
+                        throw new CbcException("Lengths of columnLowerBounds and objective must match");
+                }
+                int numRows = rowLowerBounds.length;
+                if (rowUpperBounds.length != numRows) {
+                        throw new CbcException("Lengths of rowLowerBounds and rowUpperBounds must match");
+                }
+        }
+
+        private static native int solveIlpProblem(double[] columnLowerBounds, double[] columnUpperBounds, int[] rowStarts,
+                        int[] columnIndices, double[] entries, double[] rowLowerBounds, double[] rowUpperBounds, double[] objective,
+                        double[] output, boolean lpRelaxation, double timeoutSeconds, boolean silent);
+}