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/**
* GeoPoint
* Copyright 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
* first published 08.10.2009 on http://yacy.net
*
* This file is part of YaCy Content Integration
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.geo;
/**
* Geolocation storage may vary using different data structures for the points.
* The reason to have different implementation is to save memory for the point storage.
* With each version of a point storage comes a accuracy level which can be returned by the object.
*/
public interface GeoPoint {
public static final double meter = 90.0d / 1.0e7d; // this is actually the definition of 'meter': 10 million meter shall be the distance from the equator to the pole
/**
* get the latitude of the point
* @return
*/
public double lat();
/**
* get the longitude of the point
* @return
*/
public double lon();
/**
* get the implementation-dependent accuracy of the latitude
* @return
*/
public double accuracyLat();
/**
* get the implementation-dependent accuracy of the longitude
* @return
*/
public double accuracyLon();
/**
* compute the hash code of a coordinate
* this produces identical hash codes for locations that are close to each other
*/
@Override
public int hashCode();
/**
* equality test that is needed to use the class inside HashMap/HashSet
*/
@Override
public boolean equals(final Object o);
/**
* printout format of the point
* @return
*/
@Override
public String toString();
}
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