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/*

 * The JCS Conflation Suite (JCS) is a library of Java classes that

 * can be used to build automated or semi-automated conflation solutions.

 *

 * Copyright (C) 2003 Vivid Solutions

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; 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.vividsolutions.jcs.simplify;

import java.util.*;

import com.vividsolutions.jump.feature.*;

import com.vividsolutions.jts.geom.*;

import com.vividsolutions.jump.task.*;

public class FeatureShortSegmentRemover {

  private FeatureCollection features;

  private FeatureCollection adjustedFC;

  private double minLength;

  private double maxDisplacement;

  private int updateCount = 0;

  private int segmentsRemovedCount = 0;

  public FeatureShortSegmentRemover(FeatureCollection features, double minLength, double maxDisplacement)

  {

    this.features = features;

    this.minLength = minLength;

    this.maxDisplacement = maxDisplacement;

  }

  public int getUpdateCount()

  {

    return updateCount;

  }

  public int getSegmentsRemovedCount() { return segmentsRemovedCount; }

  public FeatureCollection process(TaskMonitor monitor)

  {

    FeatureUpdateRecorder updates =  new FeatureUpdateRecorder();

    int totalSegments = features.size();

    int count = 0;

    for (Iterator i = features.iterator(); i.hasNext(); ) {

      monitor.report(++count, totalSegments, "features");

      Feature f = (Feature) i.next();

      Geometry geom = f.getGeometry();

      GeometryShortSegmentRemover remover = new GeometryShortSegmentRemover(geom, minLength, maxDisplacement);

      Geometry newGeom = remover.getResult();

      if (remover.isModified()) {

        // don't update geometry if it's not valid

        if (newGeom.isValid()) {

          Feature newFeat = f.clone(false);

          newFeat.setGeometry(newGeom);

          // record this feature as an update to the original

          updates.update(f, newFeat);

          segmentsRemovedCount += remover.getSegmentsRemovedCount();

        }

      }

    }

    updateCount = updates.getCount();

    return updates.applyUpdates(features);

  }

}