forked from community/device-mgt-core
Gathika94
7 years ago
parent
d3eb32b5cc
commit
c74a56cb45
@ -0,0 +1,28 @@
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package org.wso2.carbon.device.mgt.core.geo;
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import org.wso2.carbon.device.mgt.core.geo.geoHash.GeoCoordinate;
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public class GeoCluster {
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private GeoCoordinate coordinates;
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private long count;
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private String geohashPrefix;
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private String deviceId;
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public GeoCluster(GeoCoordinate coordinates,long count,String geohashPrefix){
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this.coordinates=coordinates;
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this.count=count;
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this.geohashPrefix=geohashPrefix;
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}
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public long getCount() {
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return count;
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}
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public void setDeviceId(String deviceId) {
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this.deviceId = deviceId;
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}
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public String getDeviceId() {
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return deviceId;
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}
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}
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package org.wso2.carbon.device.mgt.core.geo.geoHash;
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public class GeoCoordinate {
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private double latitude;
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private double longitude;
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public GeoCoordinate(double latitude, double longitude){
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this.latitude=latitude;
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this.longitude=longitude;
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}
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public double getLatitude() {
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return latitude;
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}
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public double getLongitude() {
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return longitude;
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}
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}
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@ -0,0 +1,92 @@
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package org.wso2.carbon.device.mgt.core.geo.geoHash;
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import org.wso2.carbon.device.mgt.common.device.details.DeviceLocation;
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import java.util.HashMap;
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import java.util.Map;
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public class GeoHashGenerator {
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private static final String BASE_32 = "0123456789bcdefghjkmnpqrstuvwxyz";
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private static final int GEOHASH_LENGTH = 16;
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private GeoHashGenerator(){};
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private static int divideRangeByValue(double value, double[] range) {
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double mid = middle(range);
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if (value >= mid) {
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range[0] = mid;
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return 1;
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} else {
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range[1] = mid;
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return 0;
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}
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}
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private static void divideRangeByBit(int bit, double[] range) {
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double mid = middle(range);
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if (bit > 0) {
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range[0] = mid;
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} else {
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range[1] = mid;
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}
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}
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private static double middle(double[] range) {
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return (range[0] + range[1]) / 2;
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}
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public static String encodeGeohash(double latitude, double longitude) {
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int geohashLength=GEOHASH_LENGTH;
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double[] latRange = new double[]{-90.0, 90.0};
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double[] lonRange = new double[]{-180.0, 180.0};
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boolean isEven = true;
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int bit = 0;
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int base32CharIndex = 0;
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StringBuilder geohash = new StringBuilder();
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while (geohash.length() < geohashLength) {
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if (isEven) {
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base32CharIndex = (base32CharIndex << 1) | divideRangeByValue(longitude, lonRange);
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} else {
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base32CharIndex = (base32CharIndex << 1) | divideRangeByValue(latitude, latRange);
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}
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isEven = !isEven;
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if (bit < 4) {
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bit++;
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} else {
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geohash.append(BASE_32.charAt(base32CharIndex));
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bit = 0;
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base32CharIndex = 0;
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}
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}
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return geohash.toString();
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}
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public static String encodeGeohash(DeviceLocation deviceLocation) {
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return encodeGeohash(deviceLocation.getLatitude(), deviceLocation.getLongitude());
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}
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public static GeoCoordinate decodeGeohash(String geohash) {
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double[] latRange = new double[]{-90.0, 90.0};
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double[] lonRange = new double[]{-180.0, 180.0};
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boolean isEvenBit = true;
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for (int i = 0; i < geohash.length(); i++) {
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int base32CharIndex = BASE_32.indexOf(geohash.charAt(i));
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for (int j = 4; j >= 0; j--) {
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if (isEvenBit) {
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divideRangeByBit((base32CharIndex >> j) & 1, lonRange);
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} else {
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divideRangeByBit((base32CharIndex >> j) & 1, latRange);
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}
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isEvenBit = !isEvenBit;
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}
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}
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GeoCoordinate coordinates = new GeoCoordinate(middle(latRange),middle(lonRange));
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return coordinates;
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}
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}
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@ -0,0 +1,7 @@
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package org.wso2.carbon.device.mgt.core.geo.geoHash.geoHashStrategy;
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import org.wso2.carbon.device.mgt.core.geo.geoHash.GeoCoordinate;
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public interface GeoHashLengthStrategy {
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int getGeohashLength(GeoCoordinate southWest, GeoCoordinate northEast, int zoom);
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}
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@ -0,0 +1,50 @@
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package org.wso2.carbon.device.mgt.core.geo.geoHash.geoHashStrategy;
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import org.wso2.carbon.device.mgt.core.geo.geoHash.GeoCoordinate;
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public class ZoomGeoHashLengthStrategy implements GeoHashLengthStrategy{
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private int minGeohashLength = 1;
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private int maxGeohashLength = 16;
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private int minZoom = 1;
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private int maxZoom = 17;
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@Override
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public int getGeohashLength(GeoCoordinate southWest, GeoCoordinate northEast, int zoom) {
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double a = minGeohashLength / Math.exp(minZoom / (maxZoom - minZoom) * Math.log(maxGeohashLength / minGeohashLength));
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double b = Math.log(maxGeohashLength / minGeohashLength) / (maxZoom - minZoom);
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return (int) Math.max(minGeohashLength, Math.min(a * Math.exp(b * zoom), maxGeohashLength));
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}
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public void setMinGeohashLength(int minGeohashLength) {
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this.minGeohashLength = minGeohashLength;
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}
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public void setMaxGeohashLength(int maxGeohashLength) {
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this.maxGeohashLength = maxGeohashLength;
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}
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public void setMinZoom(int minZoom) {
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this.minZoom = minZoom;
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}
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public void setMaxZoom(int maxZoom) {
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this.maxZoom = maxZoom;
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}
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public int getMinGeohashLength() {
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return minGeohashLength;
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}
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public int getMaxGeohashLength() {
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return maxGeohashLength;
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}
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public int getMinZoom() {
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return minZoom;
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}
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public int getMaxZoom() {
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return maxZoom;
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}
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}
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