Application: gvSIG desktop » gvSIG tools: ToolBox

package es.unex.sextante.topology.extractEndpointsOfLines;

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.GeometryFactory;

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 ExtractEndpointsOfLinesAlgorithm

         extends

            GeoAlgorithm {

   public static final String LAYER  = "LAYER";

   public static final String RESULT = "RESULT";

   @Override

   public void defineCharacteristics() {

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

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

      setUserCanDefineAnalysisExtent(true);

      try {

         m_Parameters.addInputVectorLayer(LAYER, Sextante.getText("Input_Layer"), AdditionalInfoVectorLayer.SHAPE_TYPE_LINE, true);

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

      }

      catch (final RepeatedParameterNameException e) {

         Sextante.addErrorToLog(e);

      }

   }

   @Override

   public boolean processAlgorithm() throws GeoAlgorithmExecutionException {

      int i = 0;

      final IVectorLayer layerIn = m_Parameters.getParameterValueAsVectorLayer(ExtractEndpointsOfLinesAlgorithm.LAYER);

      if (!m_bIsAutoExtent) {

         layerIn.addFilter(new BoundingBoxFilter(m_AnalysisExtent));

      }

      final Class[] in_ftypes = layerIn.getFieldTypes();

      final Class[] out_ftypes = new Class[in_ftypes.length + 2];

      System.arraycopy(in_ftypes, 0, out_ftypes, 0, in_ftypes.length);

      out_ftypes[out_ftypes.length - 2] = Integer.class;

      out_ftypes[out_ftypes.length - 1] = Integer.class;

      final String[] in_fnames = layerIn.getFieldNames();

      final String[] out_fnames = new String[in_ftypes.length + 2];

      System.arraycopy(in_fnames, 0, out_fnames, 0, in_fnames.length);

      out_fnames[out_fnames.length - 2] = "LINEFID";

      out_fnames[out_fnames.length - 1] = "ISSTART";

      final IVectorLayer driver = getNewVectorLayer(ExtractEndpointsOfLinesAlgorithm.RESULT, Sextante.getText("Endpoints"),

               OutputVectorLayer.SHAPE_TYPE_POINT, out_ftypes, out_fnames);

      final IFeatureIterator iter = layerIn.iterator();

      final int iTotal = layerIn.getShapesCount();

      final Object[] values = new Object[out_fnames.length];

      int count = 0;

      final GeometryFactory gf = new GeometryFactory();

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

         final IFeature feature = iter.next();

         final Coordinate[] coords = feature.getGeometry().getCoordinates();

         final Object[] aux_values = feature.getRecord().getValues();

         System.arraycopy(aux_values, 0, values, 0, aux_values.length);

         values[values.length - 2] = count;

         values[values.length - 1] = 0;

         final Point startPoint = gf.createPoint(coords[0]);

         driver.addFeature(startPoint, values);

         count++;

         System.arraycopy(aux_values, 0, values, 0, aux_values.length);

         values[values.length - 2] = count;

         values[values.length - 1] = 1;

         final Point endPoint = gf.createPoint(coords[coords.length - 1]);

         driver.addFeature(endPoint, values);

         setProgress(i, iTotal);

         i++;

      }

      iter.close();

      return !m_Task.isCanceled();

   }

}