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H2 Spatial API define extension point of h2 spatial

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/**
 * H2GIS is a library that brings spatial support to the H2 Database Engine
 * .
 *
 * H2GIS is distributed under GPL 3 license. It is produced by CNRS
 * .
 *
 * H2GIS 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.
 *
 * H2GIS 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
 * H2GIS. If not, see .
 *
 * For more information, please consult: 
 * or contact directly: info_at_h2gis.org
 */
package org.h2gis.h2spatialapi;

import java.util.HashMap;
import java.util.Map;

/**
 * Function that handle properties in a map
 * @author Nicolas Fortin
 */
public abstract class AbstractFunction implements Function {
    private Map properties = new HashMap();

    @Override
    public Object getProperty(String propertyName) {
        return properties.get(propertyName);
    }

    /**
     * @param propertyName Property identifier
     * @param value New property value
     */
    public void addProperty(String propertyName, Object value) {
        properties.put(propertyName,value);
    }

    /**
     * @param propertyName Property identifier
     * @return True if the property is removed
     */
    public boolean removeProperty(String propertyName) {
        return properties.remove(propertyName)!=null;
    }
}