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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  package org.apache.commons.geometry.euclidean.threed;
    18
    19  import java.util.Iterator;
    20  import java.util.stream.Stream;
    21
    22
    23  /** Class used to construct {@link Bounds3D} instances representing the min and
    24   * max points present in a {@link BoundarySource3D}. The implementation examines
    25   * the vertices of each boundary in turn. Null is returned if any boundaries are
    26   * infinite or no vertices are present.
    27   */
    28  final class BoundarySourceBoundsBuilder3D {
    29
    30      /** Get a {@link Bounds3D} instance containing all vertices in the given boundary source.
    31       * Null is returned if any encountered boundaries were not finite or no vertices were found.
    32       * @param src the boundary source to compute the bounds of
    33       * @return the bounds of the argument or null if no valid bounds could be determined
    34       */
    35      public Bounds3D getBounds(final BoundarySource3D src) {
    36          final Bounds3D.Builder builder = Bounds3D.builder();
    37
    38          try (Stream<PlaneConvexSubset> stream = src.boundaryStream()) {
    39              final Iterator<PlaneConvexSubset> it = stream.iterator();
    40
    41              PlaneConvexSubset boundary;
    42              while (it.hasNext()) {
    43                  boundary = it.next();
    44
    45                  if (!boundary.isFinite()) {
    46                      return null;
    47                  }
    48
    49                  builder.addAll(boundary.getVertices());
    50              }
    51          }
    52
    53          return builder.hasBounds() ?
    54                  builder.build() :
    55                  null;
    56      }
    57  }