Application: gvSIG desktop » gvSIG tools: ToolBox

package es.unex.sextante.topology.nodeLines;

import com.vividsolutions.jts.geom.Geometry;

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 NodeLinesAlgorithm

         extends

            GeoAlgorithm {

   public static final String RESULT = "RESULT";

   public static final String LINES  = "LINES";

   private IVectorLayer       m_Output;

   @Override

   public void defineCharacteristics() {

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

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

      setUserCanDefineAnalysisExtent(true);

      try {

         m_Parameters.addInputVectorLayer(LINES, Sextante.getText("Lines"), AdditionalInfoVectorLayer.SHAPE_TYPE_LINE, true);

         addOutputVectorLayer(RESULT, Sextante.getText("Lines"), OutputVectorLayer.SHAPE_TYPE_LINE, LINES);

      }

      catch (final RepeatedParameterNameException e) {

         Sextante.addErrorToLog(e);

      }

   }

   @Override

   public boolean processAlgorithm() throws GeoAlgorithmExecutionException {

      final IVectorLayer lines = m_Parameters.getParameterValueAsVectorLayer(LINES);

      if (!m_bIsAutoExtent) {

         lines.addFilter(new BoundingBoxFilter(m_AnalysisExtent));

      }

      m_Output = getNewVectorLayer(RESULT, Sextante.getText("Result"), IVectorLayer.SHAPE_TYPE_LINE, lines.getFieldTypes(),

               lines.getFieldNames());

      int i = 0;

      final int iShapeCount = lines.getShapesCount();

      IFeatureIterator iter = lines.iterator();

      IFeature feature = iter.next();

      Geometry geom = feature.getGeometry();

      final Geometry merged = geom;

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

         feature = iter.next();

         geom = feature.getGeometry();

         merged.union(geom);

         i++;

      }

      iter.close();

      i = 0;

      iter = lines.iterator();

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

         feature = iter.next();

         m_Output.addFeature(merged.getGeometryN(i), feature.getRecord().getValues());

         i++;

      }

      iter.close();

      return !m_Task.isCanceled();

   }

}