Application: gvSIG desktop » gvSIG tools: ToolBox

package es.unex.sextante.vectorTools.centroids;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.Point;

import es.unex.sextante.additionalInfo.AdditionalInfoVectorLayer;

import es.unex.sextante.core.GeoAlgorithm;

import es.unex.sextante.core.Sextante;

import es.unex.sextante.dataObjects.IFeature;

import es.unex.sextante.dataObjects.IFeatureIterator;

import es.unex.sextante.dataObjects.IVectorLayer;

import es.unex.sextante.dataObjects.vectorFilters.BoundingBoxFilter;

import es.unex.sextante.exceptions.GeoAlgorithmExecutionException;

import es.unex.sextante.exceptions.RepeatedParameterNameException;

import es.unex.sextante.outputs.OutputVectorLayer;

public class CentroidsAlgorithm

         extends

            GeoAlgorithm {

   public static final String LAYER  = "LAYER";

   public static final String RESULT = "RESULT";

   @Override

   public boolean processAlgorithm() throws GeoAlgorithmExecutionException {

      int i = 0;

      final IVectorLayer layerIn = m_Parameters.getParameterValueAsVectorLayer(LAYER);

      if (!m_bIsAutoExtent) {

         layerIn.addFilter(new BoundingBoxFilter(m_AnalysisExtent));

      }

      final IVectorLayer result = getNewVectorLayer(RESULT, Sextante.getText("Centroids"), IVectorLayer.SHAPE_TYPE_POINT,

               layerIn.getFieldTypes(), layerIn.getFieldNames());

      final IFeatureIterator iter = layerIn.iterator();

      final int iTotal = layerIn.getShapesCount();

      while (iter.hasNext() && setProgress(i, iTotal)) {

         final IFeature feature = iter.next();

         final Point centroid = getCentroid(feature.getGeometry());

         result.addFeature(centroid, feature.getRecord().getValues());

         i++;

      }

      iter.close();

      return !m_Task.isCanceled();

   }

   @Override

   public void defineCharacteristics() {

      setName(Sextante.getText("Centroids"));

      setGroup(Sextante.getText("Tools_for_vector_layers"));

      try {

         m_Parameters.addInputVectorLayer(LAYER, Sextante.getText("Vector_layer"), AdditionalInfoVectorLayer.SHAPE_TYPE_ANY, true);

         addOutputVectorLayer(RESULT, Sextante.getText("Centroids"), OutputVectorLayer.SHAPE_TYPE_POINT);

      }

      catch (final RepeatedParameterNameException e) {

         Sextante.addErrorToLog(e);

      }

   }

   private Point getCentroid(final Geometry geometry) {

      return geometry.getCentroid();

   }

}