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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.io.euclidean.threed.obj;
    18
    19  import java.io.Reader;
    20  import java.util.ArrayList;
    21  import java.util.List;
    22
    23  import org.apache.commons.geometry.euclidean.threed.Vector3D;
    24  import org.apache.commons.geometry.io.euclidean.threed.FacetDefinition;
    25  import org.apache.commons.geometry.io.euclidean.threed.FacetDefinitionReader;
    26  import org.apache.commons.geometry.io.euclidean.threed.SimpleFacetDefinition;
    27
    28  /** Class for reading {@link FacetDefinition facets} from OBJ content.
    29   */
    30  public class ObjFacetDefinitionReader extends AbstractObjPolygonReader
    31      implements FacetDefinitionReader {
    32
    33      /** List of vertices encountered in the input. */
    34      private final List<Vector3D> vertices = new ArrayList<>();
    35
    36      /** List of normals encountered in the input. */
    37      private final List<Vector3D> normals = new ArrayList<>();
    38
    39      /** Construct a new instance that reads OBJ content from the given reader.
    40       * @param reader reader to read from
    41       */
    42      public ObjFacetDefinitionReader(final Reader reader) {
    43          super(reader);
    44      }
    45
    46      /** {@inheritDoc} */
    47      @Override
    48      public FacetDefinition readFacet() {
    49          final PolygonObjParser.Face face = readFace();
    50          if (face != null) {
    51              final List<Vector3D> faceVertices = face.getVertices(vertices::get);
    52              final Vector3D definedNormal = face.getDefinedCompositeNormal(normals::get);
    53
    54              return new SimpleFacetDefinition(faceVertices, definedNormal);
    55          }
    56
    57          return null;
    58      }
    59
    60      /** {@inheritDoc} */
    61      @Override
    62      protected void handleVertex(final Vector3D vertex) {
    63          vertices.add(vertex);
    64      }
    65
    66      /** {@inheritDoc} */
    67      @Override
    68      protected void handleNormal(final Vector3D normal) {
    69          normals.add(normal);
    70      }
    71  }