Пример #1
0
  /**
   * Build an appropriate <code>Geometry</code>, <code>MultiGeometry</code>, or <code>
   * GeometryCollection</code> to contain the <code>Geometry</code>s in it. For example:<br>
   *
   * <ul>
   *   <li>If <code>geomList</code> contains a single <code>Polygon</code>, the <code>Polygon</code>
   *       is returned.
   *   <li>If <code>geomList</code> contains several <code>Polygon</code>s, a <code>MultiPolygon
   *       </code> is returned.
   *   <li>If <code>geomList</code> contains some <code>Polygon</code>s and some <code>LineString
   *       </code>s, a <code>GeometryCollection</code> is returned.
   *   <li>If <code>geomList</code> is empty, an empty <code>GeometryCollection</code> is returned
   * </ul>
   *
   * Note that this method does not "flatten" Geometries in the input, and hence if any
   * MultiGeometries are contained in the input a GeometryCollection containing them will be
   * returned.
   *
   * @param geomList the <code>Geometry</code>s to combine
   * @return a <code>Geometry</code> of the "smallest", "most type-specific" class that can contain
   *     the elements of <code>geomList</code> .
   */
  public Geometry buildGeometry(Collection geomList) {

    /** Determine some facts about the geometries in the list */
    Class geomClass = null;
    boolean isHeterogeneous = false;
    boolean hasGeometryCollection = false;
    for (Iterator i = geomList.iterator(); i.hasNext(); ) {
      Geometry geom = (Geometry) i.next();
      Class partClass = geom.getClass();
      if (geomClass == null) {
        geomClass = partClass;
      }
      if (partClass != geomClass) {
        isHeterogeneous = true;
      }
      if (geom instanceof GeometryCollection) hasGeometryCollection = true;
    }

    /** Now construct an appropriate geometry to return */
    // for the empty geometry, return an empty GeometryCollection
    if (geomClass == null) {
      return createGeometryCollection(null);
    }
    if (isHeterogeneous || hasGeometryCollection) {
      return createGeometryCollection(toGeometryArray(geomList));
    }
    // at this point we know the collection is hetereogenous.
    // Determine the type of the result from the first Geometry in the list
    // this should always return a geometry, since otherwise an empty collection would have already
    // been returned
    Geometry geom0 = (Geometry) geomList.iterator().next();
    boolean isCollection = geomList.size() > 1;
    if (isCollection) {
      if (geom0 instanceof Polygon) {
        return createMultiPolygon(toPolygonArray(geomList));
      } else if (geom0 instanceof LineString) {
        return createMultiLineString(toLineStringArray(geomList));
      } else if (geom0 instanceof Point) {
        return createMultiPoint(toPointArray(geomList));
      }
      Assert.shouldNeverReachHere("Unhandled class: " + geom0.getClass().getName());
    }
    return geom0;
  }
Пример #2
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param multiLineStrings the <code>List</code> of MultiLineStrings to convert
  * @return the <code>List</code> in array format
  */
 public static MultiLineString[] toMultiLineStringArray(Collection multiLineStrings) {
   MultiLineString[] multiLineStringArray = new MultiLineString[multiLineStrings.size()];
   return (MultiLineString[]) multiLineStrings.toArray(multiLineStringArray);
 }
Пример #3
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param multiPoints the <code>List</code> of MultiPoints to convert
  * @return the <code>List</code> in array format
  */
 public static MultiPoint[] toMultiPointArray(Collection multiPoints) {
   MultiPoint[] multiPointArray = new MultiPoint[multiPoints.size()];
   return (MultiPoint[]) multiPoints.toArray(multiPointArray);
 }
Пример #4
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param multiPolygons the <code>List</code> of MultiPolygons to convert
  * @return the <code>List</code> in array format
  */
 public static MultiPolygon[] toMultiPolygonArray(Collection multiPolygons) {
   MultiPolygon[] multiPolygonArray = new MultiPolygon[multiPolygons.size()];
   return (MultiPolygon[]) multiPolygons.toArray(multiPolygonArray);
 }
Пример #5
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param polygons the <code>List</code> of Polygons to convert
  * @return the <code>List</code> in array format
  */
 public static Polygon[] toPolygonArray(Collection polygons) {
   Polygon[] polygonArray = new Polygon[polygons.size()];
   return (Polygon[]) polygons.toArray(polygonArray);
 }
Пример #6
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param lineStrings the <code>List</code> of LineStrings to convert
  * @return the <code>List</code> in array format
  */
 public static LineString[] toLineStringArray(Collection lineStrings) {
   LineString[] lineStringArray = new LineString[lineStrings.size()];
   return (LineString[]) lineStrings.toArray(lineStringArray);
 }
Пример #7
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param geometries the list of <code>Geometry's</code> to convert
  * @return the <code>List</code> in array format
  */
 public static Geometry[] toGeometryArray(Collection geometries) {
   if (geometries == null) return null;
   Geometry[] geometryArray = new Geometry[geometries.size()];
   return (Geometry[]) geometries.toArray(geometryArray);
 }
Пример #8
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 /**
  * Converts the <code>List</code> to an array.
  *
  * @param points the <code>List</code> of Points to convert
  * @return the <code>List</code> in array format
  */
 public static Point[] toPointArray(Collection points) {
   Point[] pointArray = new Point[points.size()];
   return (Point[]) points.toArray(pointArray);
 }