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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.optim.linear;
+
+import org.apache.commons.math3.optim.OptimizationData;
+import org.apache.commons.math3.optim.PointValuePair;
+
+/**
+ * A callback object that can be provided to a linear optimizer to keep track
+ * of the best solution found.
+ *
+ * @since 3.3
+ */
+public class SolutionCallback implements OptimizationData {
+ /** The SimplexTableau used by the SimplexSolver. */
+ private SimplexTableau tableau;
+
+ /**
+ * Set the simplex tableau used during the optimization once a feasible
+ * solution has been found.
+ *
+ * @param tableau the simplex tableau containing a feasible solution
+ */
+ void setTableau(final SimplexTableau tableau) {
+ this.tableau = tableau;
+ }
+
+ /**
+ * Retrieve the best solution found so far.
+ * <p>
+ * <b>Note:</b> the returned solution may not be optimal, e.g. in case
+ * the optimizer did reach the iteration limits.
+ *
+ * @return the best solution found so far by the optimizer, or {@code null} if
+ * no feasible solution could be found
+ */
+ public PointValuePair getSolution() {
+ return tableau != null ? tableau.getSolution() : null;
+ }
+
+ /**
+ * Returns if the found solution is optimal.
+ * @return {@code true} if the solution is optimal, {@code false} otherwise
+ */
+ public boolean isSolutionOptimal() {
+ return tableau != null ? tableau.isOptimal() : false;
+ }
+}