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https://github.com/yacy/yacy_search_server.git
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eaddf2d464
- added caption to maps containing latitude and longitude information - prevented that maps occur on second search page - added location names to did-you-mean - some refactoring of did-you-mean - added equal and compareTo test to Coordinates class to make that work in set - fixed utf-8 support for library files - fixed a bug in images search icon view caption git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6294 6c8d7289-2bf4-0310-a012-ef5d649a1542
94 lines
3.0 KiB
Java
94 lines
3.0 KiB
Java
// Coordinates.java
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// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 04.10.2009 on http://yacy.net
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//
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// This is a part of YaCy
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.data;
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public class Coordinates implements Comparable<Coordinates> {
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private static final double tenmeter = 90.0 / 1.0e6;
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private double lon, lat;
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public Coordinates(double lon, double lat) {
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this.lon = lon;
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this.lat = lat;
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}
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public double lon() {
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return this.lon;
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}
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public double lat() {
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return this.lat;
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}
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private static final double bits30 = new Double(1L << 30).doubleValue(); // this is about one billion (US)
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private static final double upscale = bits30 / 360.0;
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private static final int coord2int(double coord) {
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return (int) ((coord + 180.0) * upscale);
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}
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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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public int hashCode() {
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int lon1 = coord2int(this.lon) >> 15;
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int lat1 = coord2int(this.lat) >> 15;
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int h = (lon1 << 15) + lat1;
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System.out.println("lon=" + this.lon + ", lat=" + this.lat + ", hash=" + h);
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return h;
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}
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/**
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* comparator that is needed to use the class inside TreeMap/TreeSet
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*/
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public int compareTo(Coordinates o) {
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if (this.equals(o)) return 0;
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int s = this.hashCode();
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int t = o.hashCode();
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if (s > t) return 1;
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if (s < t) return -1;
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return 0;
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}
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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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public boolean equals(Object o) {
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if (!(o instanceof Coordinates)) return false;
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Coordinates oo = (Coordinates) o;
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if (this.lon == oo.lon && this.lat == oo.lat) return true;
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// we access fuzzy values that are considered as equal if they are close to each other
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return Math.abs(this.lon - oo.lon) < tenmeter && Math.abs(this.lat - oo.lat) < tenmeter;
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}
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public String toString() {
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return "[" + this.lon + "," + this.lat + "]";
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}
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}
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