Application: gvSIG desktop » gvSIG geoprocess

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2012 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 2

 * 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.geoprocess.algorithm.dissolve;

import java.util.Date;

import java.util.HashMap;

import java.util.Iterator;

import com.vividsolutions.jts.geom.Geometry;

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

import org.gvsig.tools.util.CompareUtils;

/**

 * Decides if dissolve two features based in an alphanumeric criteria:

 * two features will be dissolved if they have the same value for

 * a given (and single) field.

 */

public class DissolveRule implements IDissolveRule {

        protected String                    nameField           = null;

        private HashMap<String, String>  funcMap              = null;

        public DissolveRule(String nameField, HashMap<String, String> funcMap) {

                this.nameField = nameField;

                this.funcMap = funcMap;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.dissolve.IDissolveCriteria#verifyIfDissolve(com.vividsolutions.jts.geom.Geometry, com.vividsolutions.jts.geom.Geometry, org.gvsig.fmap.dal.feature.Feature)

         */

        public boolean verifyIfDissolve(Geometry g1, Geometry g2, Feature f1, Feature f2) {

                Object obj1 = f1.get(nameField);

                Object obj2 = f2.get(nameField);

                return compareTo(obj1, obj2);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.dissolve.IDissolveCriteria#isFunctionIncluded(java.lang.String)

         */

        public boolean isFunctionIncluded(String func) {

                Iterator<String> it = funcMap.values().iterator();

                while (it.hasNext()) {

                        if(it.next().compareTo(func) == 0)

                                return true;

                }

                return false;

        }

    /**

     * Compares two fields if both have the same data type

     *

     * @param obj1

     * @param obj2

     * @return

     */

    private boolean compareTo(Object obj1, Object obj2) {

        if (obj1 instanceof Comparable && obj2 instanceof Comparable) {

            return CompareUtils.compare((Comparable) obj1, (Comparable) obj2)==0;

        }

        return false;

    }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.dissolve.IDissolveCriteria#getField(java.lang.String)

         */

        public String getFieldName(String func) {

                return funcMap.get(func);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.dissolve.IDissolveCriteria#getIndexField()

         */

        public String getFieldName() {

                return nameField;

        }

}