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79 lines
2.3 KiB
Java
79 lines
2.3 KiB
Java
/**
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* GeoPoint
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* Copyright 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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* first published 08.10.2009 on http://yacy.net
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*
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* This file is part of YaCy Content Integration
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document.geolocation;
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/**
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* Geolocation storage may vary using different data structures for the points.
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* The reason to have different implementation is to save memory for the point storage.
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* With each version of a point storage comes a accuracy level which can be returned by the object.
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*/
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public interface GeoPoint {
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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
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/**
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* get the latitude of the point
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* @return
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*/
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public double lat();
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/**
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* get the longitude of the point
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* @return
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*/
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public double lon();
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/**
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* get the implementation-dependent accuracy of the latitude
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* @return
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*/
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public double accuracyLat();
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/**
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* get the implementation-dependent accuracy of the longitude
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* @return
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*/
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public double accuracyLon();
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/**
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* compute the hash code of a coordinate
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* this produces identical hash codes for locations that are close to each other
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*/
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@Override
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public int hashCode();
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/**
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* equality test that is needed to use the class inside HashMap/HashSet
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*/
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@Override
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public boolean equals(final Object o);
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/**
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* printout format of the point
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* @return
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*/
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@Override
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public String toString();
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}
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