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Lucene example source code file (FixedLatLng.java)

This example Lucene source code file (FixedLatLng.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

fixedlatlng, fixedlatlng, floatlatlng, floatlatlng, illegal, illegalargumentexception, latlng, latlng, override, override, scale_factor=1000000, scale_factor_int=1000000

The Lucene FixedLatLng.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.lucene.spatial.geometry;

/**
 * <p>NOTE: This API is still in
 * flux and might change in incompatible ways in the next
 * release.</font>
 */
public class FixedLatLng extends LatLng {
  public static final double SCALE_FACTOR=1000000;
  public static final int SCALE_FACTOR_INT=1000000;
  
  private int lat, lng;
  private boolean normalized;
  
  public FixedLatLng(int lat, int lng) {
    setLat(lat);
    setLng(lng);
  }
  
  public FixedLatLng(LatLng ll) {
    this.lat=ll.getFixedLat();
    this.lng=ll.getFixedLng();
  }
  
  protected void setLat(int lat) {
    if (lat>90*SCALE_FACTOR || lat<-90*SCALE_FACTOR) {
      throw new IllegalArgumentException("Illegal lattitude");
    }
    this.lat=lat;
  }

  protected void setLng(int lng) {
    this.lng=lng;
  }
  
  public static double fixedToDouble(int fixed) {
    return (fixed)/SCALE_FACTOR;
  }
  
  public static int doubleToFixed(double d) {
    return (int)(d*SCALE_FACTOR);
  }
  
  @Override
  public LatLng copy() {
    return new FixedLatLng(this);
  }

  @Override
  public int getFixedLat() {
    return lat;
  }

  @Override
  public int getFixedLng() {
    return lng;
  }

  @Override
  public double getLat() {
    return fixedToDouble(lat);
  }

  @Override
  public double getLng() {
    return fixedToDouble(lng);
  }

  @Override
  public boolean isFixedPoint() {
    return true;
  }

  @Override
  public FixedLatLng toFixed() {
    return this;
  }

  @Override
  public FloatLatLng toFloat() {
    return new FloatLatLng(this);
  }

  @Override
  public boolean isNormalized() {
    return 
      normalized || (
          (lng>=-180*SCALE_FACTOR_INT) &&
          (lng<=180*SCALE_FACTOR_INT)
          );
  }

  @Override
  public LatLng normalize() {
    if (isNormalized()) return this;
    
    int delta=0;
    if (lng<0) delta=360*SCALE_FACTOR_INT;
    if (lng>=0) delta=-360*SCALE_FACTOR_INT;
    
    int newLng=lng;
    while (newLng<=-180*SCALE_FACTOR_INT || newLng>=180*SCALE_FACTOR_INT) {
      newLng+=delta;
    }
    
    FixedLatLng ret=new FixedLatLng(lat, newLng);
    ret.normalized=true;
    return ret;
  }
  
  @Override
  public LatLng calculateMidpoint(LatLng other) {
    return new FixedLatLng(
        (lat+other.getFixedLat())/2,
        (lng+other.getFixedLng())/2);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = prime + lat;
    result = prime * result + lng;
    result = prime * result + (normalized ? 1231 : 1237);
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (getClass() != obj.getClass())
      return false;
    FixedLatLng other = (FixedLatLng) obj;
    if (lat != other.lat)
      return false;
    if (lng != other.lng)
      return false;
    if (normalized != other.normalized)
      return false;
    return true;
  }
  
}

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