code: /*
   Copyright 1995-2018 Esri
  
     Licensed 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.
  
   For additional information, contact:
   Environmental Systems Research Institute, Inc.
   Attn: Contracts Dept
   380 New York Street
   Redlands, California, USA 92373
  
   email: contracts@esri.com
   */
  
  package com.esri.core.geometry.ogc;
  
  import com.esri.core.geometry.Geometry;
  import com.esri.core.geometry.GeometryEngine;
  import com.esri.core.geometry.MultiPath;
  import com.esri.core.geometry.Operator;
  import com.esri.core.geometry.OperatorExportToWkb;
  import com.esri.core.geometry.OperatorFactoryLocal;
  import com.esri.core.geometry.Polyline;
  import com.esri.core.geometry.SpatialReference;
  import com.esri.core.geometry.WkbExportFlags;
  import com.esri.core.geometry.WktExportFlags;
  
  import java.nio.ByteBuffer;
  
  import static com.esri.core.geometry.SizeOf.SIZE_OF_OGC_LINE_STRING;
  
  public class OGCLineString extends OGCCurve {
  	static public String TYPE = "LineString";
  	
  	/**
  	 * The number of Points in this LineString.
  	 */
  	public int numPoints() {
  		if (multiPath.isEmpty())
  			return 0;
  		int d = multiPath.isClosedPath(0) ? 1 : 0;
  		return multiPath.getPointCount() + d;
  	}
  
  	@Override
  	public String asText() {
  		return GeometryEngine.geometryToWkt(getEsriGeometry(),
  				WktExportFlags.wktExportLineString);
  	}
  
  	@Override
  	public ByteBuffer asBinary() {
  		OperatorExportToWkb op = (OperatorExportToWkb) OperatorFactoryLocal
  				.getInstance().getOperator(Operator.Type.ExportToWkb);
  		return op.execute(WkbExportFlags.wkbExportLineString,
  				getEsriGeometry(), null);
  	}
  
  	/**
  	 * Returns the specified Point N in this LineString.
  	 * @param n The 0 based index of the Point.
  	 */
  	public OGCPoint pointN(int n) {
  		int nn;
  		if (multiPath.isClosedPath(0) && n == multiPath.getPathSize(0)) {
  			nn = multiPath.getPathStart(0);
  		} else
  			nn = n + multiPath.getPathStart(0);
  
  		return (OGCPoint) OGCGeometry.createFromEsriGeometry(
  				multiPath.getPoint(nn), esriSR);
  	}
  
  	@Override
  	public boolean isClosed() {
  		if (isEmpty())
  			return false;
  
  		return multiPath.isClosedPathInXYPlane(0);
  	}
  
  	public OGCLineString(MultiPath mp, int pathIndex, SpatialReference sr) {
  		multiPath = new Polyline();
  		if (!mp.isEmpty())
  			multiPath.addPath(mp, pathIndex, true);
  		esriSR = sr;
  	}
  
  	public OGCLineString(MultiPath mp, int pathIndex, SpatialReference sr,
  			boolean reversed) {
  		multiPath = new Polyline();
  		if (!mp.isEmpty())
  			multiPath.addPath(mp, pathIndex, !reversed);
  		esriSR = sr;
  	}
  
  	@Override
  	public double length() {
  		return multiPath.calculateLength2D();
  	}
  
  	@Override
  	public OGCPoint startPoint() {
  		return pointN(0);
  	}
  
  	@Override
  	public OGCPoint endPoint() {
  		return pointN(numPoints() - 1);
  	}
  
  	@Override
  	public String geometryType() {
  		return TYPE;
  	}
  
  	@Override
  	public long estimateMemorySize()
  	{
  		return SIZE_OF_OGC_LINE_STRING + (multiPath != null ? multiPath.estimateMemorySize() : 0);
  	}
  
  	@Override
  	public OGCGeometry locateAlong(double mValue) {
  		throw new UnsupportedOperationException();
  	}
  
  	@Override
  	public OGCGeometry locateBetween(double mStart, double mEnd) {
  		throw new UnsupportedOperationException();
  	}
  
  	@Override
  	public Geometry getEsriGeometry() {
  		return multiPath;
  	}
  
  	@Override
  	public OGCGeometry convertToMulti()
  	{
  		return new OGCMultiLineString((Polyline)multiPath, esriSR);
  	}
  	
  	@Override
  	public OGCGeometry reduceFromMulti() {
  		return this;
  	}
  	
  	MultiPath multiPath;
  }
  