/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */
package com.revolsys.geometry.operation;

import com.revolsys.geometry.algorithm.BoundaryNodeRule;
import com.revolsys.geometry.algorithm.LineIntersector;
import com.revolsys.geometry.algorithm.RobustLineIntersector;
import com.revolsys.geometry.geomgraph.GeometryGraph;
import com.revolsys.geometry.model.Geometry;
import com.revolsys.geometry.model.GeometryFactory;

/**
 * The base class for operations that require {@link GeometryGraph}s.
 *
 * @version 1.7
 */
public class GeometryGraphOperation {
  private static double getScale(final Geometry g0, final Geometry g1) {
    double scale;
    final GeometryFactory geometryFactory1 = g0.getGeometryFactory();
    final double scale0 = geometryFactory1.getScaleXY();

    final GeometryFactory geometryFactory2 = g1.getGeometryFactory();
    final double scale1 = geometryFactory2.getScaleXY();

    final int sigDigits = geometryFactory1.getMaximumSignificantDigits();
    final int otherSigDigits = geometryFactory2.getMaximumSignificantDigits();
    // use the most precise model for the result
    if (Integer.compare(sigDigits, otherSigDigits) >= 0) {
      scale = scale0;
    } else {
      scale = scale1;
    }
    return scale;
  }

  /**
   * The operation args into an array so they can be accessed by index
   */
  protected GeometryGraph[] arg; // the arg(s) of the operation

  protected final LineIntersector li;

  public GeometryGraphOperation(final Geometry g0, final Geometry g1) {
    this(g0, g1, BoundaryNodeRule.OGC_SFS_BOUNDARY_RULE
    // BoundaryNodeRule.ENDPOINT_BOUNDARY_RULE
    );
  }

  public GeometryGraphOperation(final Geometry g0, final Geometry g1,
    final BoundaryNodeRule boundaryNodeRule) {
    final double scale = getScale(g0, g1);
    this.li = new RobustLineIntersector(scale);
    this.arg = new GeometryGraph[2];
    this.arg[0] = new GeometryGraph(0, g0, boundaryNodeRule);
    this.arg[1] = new GeometryGraph(1, g1, boundaryNodeRule);
  }

  public Geometry getArgGeometry(final int i) {
    return this.arg[i].getGeometry();
  }
}