com.google.maps.internal.LatLngAdapter.java Source code

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Here is the source code for com.google.maps.internal.LatLngAdapter.java

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/*
 * Copyright 2015 Google Inc. All rights reserved.
 *
 *
 * 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.maps.internal;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import com.google.maps.model.LatLng;

import java.io.IOException;

/**
 * Handle conversion from varying types of latitude and longitude representations.
 */
public class LatLngAdapter extends TypeAdapter<LatLng> {
    /**
     * Reads in a JSON object and try to create a LatLng in one of the following formats.
     *
     * <pre>{
     *   "lat" : -33.8353684,
     *   "lng" : 140.8527069
     * }
     *
     * {
     *   "latitude": -33.865257570508334,
     *   "longitude": 151.19287000481452
     * }</pre>
     */
    @Override
    public LatLng read(JsonReader reader) throws IOException {
        if (reader.peek() == JsonToken.NULL) {
            reader.nextNull();
            return null;
        }

        double lat = 0;
        double lng = 0;
        boolean hasLat = false;
        boolean hasLng = false;

        reader.beginObject();
        while (reader.hasNext()) {
            String name = reader.nextName();
            if ("lat".equals(name) || "latitude".equals(name)) {
                lat = reader.nextDouble();
                hasLat = true;
            } else if ("lng".equals(name) || "longitude".equals(name)) {
                lng = reader.nextDouble();
                hasLng = true;
            }
        }
        reader.endObject();

        if (hasLat && hasLng) {
            return new LatLng(lat, lng);
        } else {
            return null;
        }
    }

    /**
     * Not supported.
     */
    @Override
    public void write(JsonWriter out, LatLng value) throws IOException {
        throw new UnsupportedOperationException("Unimplemented method.");
    }
}