code: /*
   Copyright 1995-2015 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;
  
  import com.esri.core.geometry.Geometry.Type;
  import java.io.Serializable;
  
  /**
   * A helper class to provide reusable segment, line, etc instances.
   */
  class SegmentBuffer implements Serializable {
  
  	private static final long serialVersionUID = 1L;
  
  	Line m_line;
  
  	// PointerOf(Bezier) m_bez;
  	Segment m_seg;
  
  	public SegmentBuffer() {
  		m_line = null;
  		m_seg = null;
  	}
  
  	public Segment get() {
  		return m_seg;
  	}
  
  	public void set(Segment seg) {
  		m_seg = seg;
  		if (seg != null) {
  			if (seg.getType() == Type.Line) {
  				Line ln = (Line) seg;
  				m_line = ln;
  			}
  			throw GeometryException.GeometryInternalError();
  		}
  	}
  	
  	public void create(Geometry.Type type)
  	{
  		if (type == Geometry.Type.Line)
  			createLine();
  		else
  			throw new GeometryException("not implemented");
  	}
  
  	public void createLine() {
  		if (null == m_line) {
  			m_line = new Line();
  
  		}
  		m_seg = m_line;
  	}
  }
  