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lotsofcode/geocoder-service.js

Forked from benmj/geocoder-service.js
Created July 1, 2014 10:08
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  1. @benmj benmj created this gist Aug 29, 2013.
    88 changes: 88 additions & 0 deletions geocoder-service.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,88 @@
    /*global angular: true, google: true, _ : true */

    'use strict';

    angular.module('geocoder', ['ngStorage']).factory('Geocoder', function ($localStorage, $q, $timeout) {
    var locations = $localStorage.locations ? JSON.parse($localStorage.locations) : {};

    var queue = [];

    // Amount of time (in milliseconds) to pause between each trip to the
    // Geocoding API, which places limits on frequency.
    var queryPause = 250;

    /**
    * executeNext() - execute the next function in the queue.
    * If a result is returned, fulfill the promise.
    * If we get an error, reject the promise (with message).
    * If we receive OVER_QUERY_LIMIT, increase interval and try again.
    */
    var executeNext = function () {
    var task = queue[0],
    geocoder = new google.maps.Geocoder();

    geocoder.geocode({ address : task.address }, function (result, status) {
    if (status === google.maps.GeocoderStatus.OK) {
    var latLng = {
    lat: result[0].geometry.location.lat(),
    lng: result[0].geometry.location.lng()
    };

    queue.shift();

    locations[task.address] = latLng;
    $localStorage.locations = JSON.stringify(locations);

    task.d.resolve(latLng);

    if (queue.length) {
    $timeout(executeNext, queryPause);
    }
    } else if (status === google.maps.GeocoderStatus.ZERO_RESULTS) {
    queue.shift();
    task.d.reject({
    type: 'zero',
    message: 'Zero results for geocoding address ' + task.address
    });
    } else if (status === google.maps.GeocoderStatus.OVER_QUERY_LIMIT) {
    queryPause += 250;
    $timeout(executeNext, queryPause);
    } else if (status === google.maps.GeocoderStatus.REQUEST_DENIED) {
    queue.shift();
    task.d.reject({
    type: 'denied',
    message: 'Request denied for geocoding address ' + task.address
    });
    } else if (status === google.maps.GeocoderStatus.INVALID_REQUEST) {
    queue.shift();
    task.d.reject({
    type: 'invalid',
    message: 'Invalid request for geocoding address ' + task.address
    });
    }
    });
    };

    return {
    latLngForAddress : function (address) {
    var d = $q.defer();

    if (_.has(locations, address)) {
    $timeout(function () {
    d.resolve(locations[address]);
    });
    } else {
    queue.push({
    address: address,
    d: d
    });

    if (queue.length === 1) {
    executeNext();
    }
    }

    return d.promise;
    }
    };
    });