Application: gvSIG desktop

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package org.gvsig.fmap.dal.swing.impl.searchPostProcess.distinctOn;

//    public static void selfRegister(){

import java.util.List;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.feature.EditableFeatureAttributeDescriptor;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryUtils;

import org.gvsig.fmap.geom.aggregate.MultiPolygon;

import org.gvsig.fmap.geom.primitive.Primitive;

import static org.gvsig.tools.dynobject.DynField.RELATION_TYPE_NONE;

 public class STConvexHullAggregateOperation extends AbstractAggregateOperation {

    public static class SumAggregateOperationFactory implements AggregateOperationFactory{

        public static final String NAME = "ST_ConvexHull";

        @Override

        public String getName() {

            return NAME;

        }

        @Override

        public AggregateOperation create(Object... os) {

            return new STConvexHullAggregateOperation();

        }

        @Override

        public boolean isApplicable(Object... value) {

            return Geometry.class.isAssignableFrom((Class<?>) value[0]);

        }

    }

    Geometry geom;

    public STConvexHullAggregateOperation() {

        this.geom = null;

    }

    @Override

    public boolean isApplicable(Object... value) {

        return value[0] instanceof Geometry;

    }

    @Override

    public void reset() {

        this.geom = null;

    }

    @Override

    public void perform(Object value) {

        try {

            if (value == null) {

                return;

            }

            if( geom == null ) {

                geom = ((Geometry)value).convexHull();

                return;

            }

            MultiPolygon mp = GeometryUtils.createMultiPolygon(geom.getGeometryType().getSubType());

            mp.addPrimitive((Primitive) geom);

            mp.addPrimitive((Primitive) value);

            geom = mp.convexHull();

        } catch (Exception ex) {

            throw new RuntimeException("",ex);

        }

    }

    @Override

    public Object getValue() {

        return this.geom;

    }

    @Override

    public void fixAttributeDescriptor(EditableFeatureAttributeDescriptor descriptor) {

        super.fixAttributeDescriptor(descriptor);

        descriptor.setDataType(DataTypes.GEOMETRY);

        descriptor.setGeometryType(Geometry.TYPES.POLYGON, Geometry.SUBTYPES.GEOM2D);

        descriptor.setRelationType(RELATION_TYPE_NONE);

        descriptor.getForeingKey().clean();

        descriptor.setAvailableValues((List)null);

    }

}