client.otpa.js.Population.js Maven / Gradle / Ivy
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The OpenTripPlanner multimodal journey planning system
otp.namespace("otp.analyst");
/**
* Population class. A population is a list of (weighted) locations.
*/
otp.analyst.Population = otp.Class({
/**
* Constructor. Create an empty population.
*/
initialize : function() {
this.data = [];
this.onLoadCallbacks = $.Callbacks();
this.maxW = 0.0;
},
/**
* Load population from JSON data.
*/
loadFromJson : function(jsonUrl, options) {
var thisPl = this;
this._loadAjax(jsonUrl, options, function(payload) {
payload = $.parseJSON(payload);
for (var i = 0; i < payload.length; i++) {
thisPl.add(payload[i]);
}
});
return this;
},
/**
* Load population from server pointset.
*/
loadFromServer : function(id, options) {
var thisPl = this;
options = $.extend({
async : false
}, options);
this._loadAjax('/otp/pointsets/' + id, options, function(payload) {
$.each(payload.features, function(index, item) {
var item2 = {
location : {
lat : item.geometry.coordinates[1],
lng : item.geometry.coordinates[0]
},
w : 1.0
};
for ( var propName in item.properties.structured) {
// Hack: take first numeric property as w value
var propValue = item.properties.structured[propName];
if ($.isNumeric(propValue)) {
item2.w = propValue;
break;
}
}
thisPl.add(item2);
});
});
return this;
},
/**
* Load population from CSV data.
*/
loadFromCsv : function(csvUrl, options) {
var thisPl = this;
this._loadAjax(csvUrl, options, function(payload) {
payload = thisPl._parseCsv(payload);
if (payload.length < 1)
return;
// Find the various column indexes from CSV header
var latCol, lonCol, nameCol, weightCol;
for (var col = 0; col < payload[0].length; col++) {
var header = payload[0][col];
if (header == options.latColName) {
latCol = col;
} else if (header == options.lonColName) {
lonCol = col;
} else if (header == options.nameColName) {
nameCol = col;
} else if (header == options.weightColName) {
weightCol = col;
}
}
if (latCol == null || lonCol == null)
return; // Mandatory fields
for (var row = 1; row < payload.length; row++) {
var item = {
location : {
lat : payload[row][latCol],
lng : payload[row][lonCol]
},
w : (typeof weightCol != 'undefined') ? payload[row][weightCol] : 1.0
};
if (typeof nameCol != 'undefined')
item.name = payload[row][nameCol];
thisPl.add(item);
}
});
return this;
},
/**
* Generic ajax-loading.
*/
_loadAjax : function(url, options, dataCallback) {
var thisPl = this;
$.ajax({
url : url,
success : function(result) {
dataCallback(result);
thisPl.onLoadCallbacks.fire(thisPl);
},
async : options.async
});
return this;
},
/**
* Add a callback when loaded.
*/
onLoad : function(callback) {
this.onLoadCallbacks.add(callback);
return this;
},
/**
* Add a location programmatically.
*/
add : function(poi) {
this.data.push(poi);
if (poi.w > this.maxW) {
this.maxW = poi.w;
}
return this;
},
/**
* Return the max weight of all individuals.
*/
getMaxW : function() {
return this.maxW;
},
/**
* TODO How to properly implement iterators in JS?
*
* @return The number of elements in the list.
*/
size : function() {
return this.data.length;
},
/**
* @return The nth element in the list.
*/
get : function(index) {
return this.data[index];
},
/**
* Parse CSV data. See http://stackoverflow.com/questions/1293147
*/
_parseCsv : function(csv, reviver) {
reviver = reviver || function(r, c, v) {
return v;
};
var chars = csv.split(''), c = 0, cc = chars.length, start, end, table = [], row;
while (c < cc) {
table.push(row = []);
while (c < cc && '\r' !== chars[c] && '\n' !== chars[c]) {
start = end = c;
if ('"' === chars[c]) {
start = end = ++c;
while (c < cc) {
if ('"' === chars[c]) {
if ('"' !== chars[c + 1]) {
break;
} else {
chars[++c] = '';
} // unescape ""
}
end = ++c;
}
if ('"' === chars[c])
++c;
while (c < cc && '\r' !== chars[c] && '\n' !== chars[c] && ',' !== chars[c])
++c;
} else {
while (c < cc && '\r' !== chars[c] && '\n' !== chars[c] && ',' !== chars[c])
end = ++c;
}
row.push(reviver(table.length - 1, row.length, chars.slice(start, end).join('')));
if (',' === chars[c])
++c;
}
if ('\r' === chars[c])
++c;
if ('\n' === chars[c])
++c;
}
return table;
},
});
/**
* Return the list of populations from the server (pointsets interface)
*/
otp.analyst.Population.listServerPointSets = function(dataCallback) {
var payload = $.ajax({
url : '/otp/pointsets',
success : function(result) {
dataCallback(result);
}
});
};
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