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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.geometry.partitioning;
+
+import org.apache.commons.math3.geometry.Point;
+import org.apache.commons.math3.geometry.Space;
+
+/** Class holding the result of point projection on region boundary.
+ * <p>This class is a simple placeholder, it does not provide any
+ * processing methods.</p>
+ * <p>Instances of this class are guaranteed to be immutable</p>
+ * @param <S> Type of the space.
+ * @since 3.3
+ * @see AbstractRegion#projectToBoundary(Point)
+ */
+public class BoundaryProjection<S extends Space> {
+
+ /** Original point. */
+ private final Point<S> original;
+
+ /** Projected point. */
+ private final Point<S> projected;
+
+ /** Offset of the point with respect to the boundary it is projected on. */
+ private final double offset;
+
+ /** Constructor from raw elements.
+ * @param original original point
+ * @param projected projected point
+ * @param offset offset of the point with respect to the boundary it is projected on
+ */
+ public BoundaryProjection(final Point<S> original, final Point<S> projected, final double offset) {
+ this.original = original;
+ this.projected = projected;
+ this.offset = offset;
+ }
+
+ /** Get the original point.
+ * @return original point
+ */
+ public Point<S> getOriginal() {
+ return original;
+ }
+
+ /** Projected point.
+ * @return projected point, or null if there are no boundary
+ */
+ public Point<S> getProjected() {
+ return projected;
+ }
+
+ /** Offset of the point with respect to the boundary it is projected on.
+ * <p>
+ * The offset with respect to the boundary is negative if the {@link
+ * #getOriginal() original point} is inside the region, and positive otherwise.
+ * </p>
+ * <p>
+ * If there are no boundary, the value is set to either {@code
+ * Double.POSITIVE_INFINITY} if the region is empty (i.e. all points are
+ * outside of the region) or {@code Double.NEGATIVE_INFINITY} if the region
+ * covers the whole space (i.e. all points are inside of the region).
+ * </p>
+ * @return offset of the point with respect to the boundary it is projected on
+ */
+ public double getOffset() {
+ return offset;
+ }
+
+}