Application: gvSIG desktop

    public class EnvelopeValue implements CalculatedValue<Envelope> {

        private Envelope value = null;

        @Override

        public void calculate() {

            try {

                String columnName = getFeatureStore()

                        .getDefaultFeatureType()

                        .getDefaultGeometryAttributeName();

                IProjection crs = getFeatureStore()

                        .getDefaultFeatureType()

                        .getDefaultSRS();

                        crs

                    );

                value = (Envelope) calculateEnvelopeOfColumn.perform();

            } catch(Exception ex) {

                throw new RuntimeException("Can't calculate envelope.", ex);

            }

        }

        @Override

        public void reset() {

            this.value = null;

        }

        @Override

        public Envelope get() {

                this.calculate();

            }

            return this.value;