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重写geoserver发送到h2的sql，以实现自定义数据源

There is a newer version: 1.11

package org.khelekore.prtree;

/** A class that can calculate the distance to a given object
 *  stored in the PRTree
 * @param  the data type to calculate distances to
 */
public interface DistanceCalculator {
    /** Calculate the distance between the given object and the point
     * @param t the object to calculate the distance to
     * @param p the point
     * @return The calculated distance
     */
    double distanceTo (T t, PointND p);
}