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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;
+
+import org.apache.commons.math3.util.Pair;
+
+import java.io.Serializable;
+
+/**
+ * This class holds a point and the vectorial value of an objective function at that point.
+ *
+ * @see PointValuePair
+ * @see org.apache.commons.math3.analysis.MultivariateVectorFunction
+ * @since 3.0
+ */
+public class PointVectorValuePair extends Pair<double[], double[]> implements Serializable {
+ /** Serializable UID. */
+ private static final long serialVersionUID = 20120513L;
+
+ /**
+ * Builds a point/objective function value pair.
+ *
+ * @param point Point coordinates. This instance will store a copy of the array, not the array
+ * passed as argument.
+ * @param value Value of the objective function at the point.
+ */
+ public PointVectorValuePair(final double[] point, final double[] value) {
+ this(point, value, true);
+ }
+
+ /**
+ * Build a point/objective function value pair.
+ *
+ * @param point Point coordinates.
+ * @param value Value of the objective function at the point.
+ * @param copyArray if {@code true}, the input arrays will be copied, otherwise they will be
+ * referenced.
+ */
+ public PointVectorValuePair(
+ final double[] point, final double[] value, final boolean copyArray) {
+ super(
+ copyArray ? ((point == null) ? null : point.clone()) : point,
+ copyArray ? ((value == null) ? null : value.clone()) : value);
+ }
+
+ /**
+ * Gets the point.
+ *
+ * @return a copy of the stored point.
+ */
+ public double[] getPoint() {
+ final double[] p = getKey();
+ return p == null ? null : p.clone();
+ }
+
+ /**
+ * Gets a reference to the point.
+ *
+ * @return a reference to the internal array storing the point.
+ */
+ public double[] getPointRef() {
+ return getKey();
+ }
+
+ /**
+ * Gets the value of the objective function.
+ *
+ * @return a copy of the stored value of the objective function.
+ */
+ @Override
+ public double[] getValue() {
+ final double[] v = super.getValue();
+ return v == null ? null : v.clone();
+ }
+
+ /**
+ * Gets a reference to the value of the objective function.
+ *
+ * @return a reference to the internal array storing the value of the objective function.
+ */
+ public double[] getValueRef() {
+ return super.getValue();
+ }
+
+ /**
+ * Replace the instance with a data transfer object for serialization.
+ *
+ * @return data transfer object that will be serialized
+ */
+ private Object writeReplace() {
+ return new DataTransferObject(getKey(), getValue());
+ }
+
+ /** Internal class used only for serialization. */
+ private static class DataTransferObject implements Serializable {
+ /** Serializable UID. */
+ private static final long serialVersionUID = 20120513L;
+
+ /** Point coordinates. @Serial */
+ private final double[] point;
+
+ /** Value of the objective function at the point. @Serial */
+ private final double[] value;
+
+ /**
+ * Simple constructor.
+ *
+ * @param point Point coordinates.
+ * @param value Value of the objective function at the point.
+ */
+ DataTransferObject(final double[] point, final double[] value) {
+ this.point = point.clone();
+ this.value = value.clone();
+ }
+
+ /**
+ * Replace the deserialized data transfer object with a {@link PointValuePair}.
+ *
+ * @return replacement {@link PointValuePair}
+ */
+ private Object readResolve() {
+ return new PointVectorValuePair(point, value, false);
+ }
+ }
+}