Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2020 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.expressionevaluator.impl.function.dataaccess;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.impl.DALFunctions;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

import static org.gvsig.fmap.dal.DataManager.FUNCTION_CURRENT_ROW;

import static org.gvsig.fmap.dal.DataManager.FUNCTION_ISSELECTED_CURRENT_ROW;

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

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

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

/**

 *

 * @author jjdelcerro

 */

public class IsSelectedCurrentRowFunction extends AbstractFunction {

  public IsSelectedCurrentRowFunction() {

    super(

            DALFunctions.GROUP_DATA_ACCESS, 

            FUNCTION_ISSELECTED_CURRENT_ROW, 

            Range.is(0), 

            "Return if the current feature is selected in the store when used in a filter.\n" 

                    + "Return false if used outer a filter.", 

            FUNCTION_ISSELECTED_CURRENT_ROW+"()", 

            null, 

            "Boolean",

            false

    );

  }

  private Feature current_row(Interpreter interpreter) {

    try {

      Feature f = (Feature) interpreter.call(FUNCTION_CURRENT_ROW);

      return f;

    } catch (Exception ex) {

      return null;

    }

  }

  @Override

  public Object call(Interpreter interpreter, Object[] args) throws Exception {

    Feature feature = current_row(interpreter);

    if (feature == null) {

      return false;

    }

    FeatureStore store = feature.getStore();

    FeatureSelection selection = store.getFeatureSelection();

    return selection.isSelected(feature);

  }

}