content: /*
   * 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.ailiwean.core.zxing.core.client.result;
  
  
  import com.ailiwean.core.zxing.core.Result;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * 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
   */
  public final class GeoResultParser extends ResultParser {
  
    private static final Pattern GEO_URL_PATTERN = 
        Pattern.compile("geo:([\\-0-9.]+),([\\-0-9.]+)(?:,([\\-0-9.]+))?(?:\\?(.*))?", Pattern.CASE_INSENSITIVE);
    
    @Override
    public GeoParsedResult parse(Result result) {
      CharSequence rawText = getMassagedText(result);
      Matcher matcher = GEO_URL_PATTERN.matcher(rawText);
      if (!matcher.matches()) {
        return null;
      }
  
      String query = matcher.group(4);
  
      double latitude;
      double longitude;
      double altitude;
      try {
        latitude = Double.parseDouble(matcher.group(1));
        if (latitude > 90.0 || latitude < -90.0) {
          return null;
        }
        longitude = Double.parseDouble(matcher.group(2));
        if (longitude > 180.0 || longitude < -180.0) {
          return null;
        }
        if (matcher.group(3) == null) {
          altitude = 0.0;
        } else {
          altitude = Double.parseDouble(matcher.group(3));
          if (altitude < 0.0) {
            return null;
          }
        }
      } catch (NumberFormatException ignored) {
        return null;
      }
      return new GeoParsedResult(latitude, longitude, altitude, query);
    }
  
  }