/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.client.result;
import com.google.zxing.Result;
/**
* Parses a "geo:" URI result, which specifies a location on the surface of
* the Earth as well as an optional altitude above the surface. See
* <a href="http://tools.ietf.org/html/draft-mayrhofer-geo-uri-00">
* http://tools.ietf.org/html/draft-mayrhofer-geo-uri-00</a>.
*
* @author Sean Owen
*/
final class GeoResultParser extends ResultParser {
private GeoResultParser() {
}
public static GeoParsedResult parse(Result result) {
String rawText = result.getText();
if (rawText == null || (!rawText.startsWith("geo:") && !rawText.startsWith("GEO:"))) {
return null;
}
// Drop geo, query portion
int queryStart = rawText.indexOf('?', 4);
String query;
String geoURIWithoutQuery;
if (queryStart < 0) {
query = null;
geoURIWithoutQuery = rawText.substring(4);
} else {
query = rawText.substring(queryStart + 1);
geoURIWithoutQuery = rawText.substring(4, queryStart);
}
int latitudeEnd = geoURIWithoutQuery.indexOf(',');
if (latitudeEnd < 0) {
return null;
}
int longitudeEnd = geoURIWithoutQuery.indexOf(',', latitudeEnd + 1);
double latitude;
double longitude;
double altitude;
try {
latitude = Double.parseDouble(geoURIWithoutQuery.substring(0, latitudeEnd));
if (latitude > 90.0 || latitude < -90.0) {
return null;
}
if (longitudeEnd < 0) {
longitude = Double.parseDouble(geoURIWithoutQuery.substring(latitudeEnd + 1));
altitude = 0.0;
} else {
longitude = Double.parseDouble(geoURIWithoutQuery.substring(latitudeEnd + 1, longitudeEnd));
altitude = Double.parseDouble(geoURIWithoutQuery.substring(longitudeEnd + 1));
}
if (longitude > 180.0 || longitude < -180.0 || altitude < 0) {
return null;
}
} catch (NumberFormatException nfe) {
return null;
}
return new GeoParsedResult(latitude, longitude, altitude, query);
}
}