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Delta Service
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/* | |
* Checks two Date objects based on human date (mm/dd/yyyy) two test equality | |
* | |
* @param {Date} date1 | |
* @param {Date} date2 | |
* @return {Boolean} | |
*/ | |
function sameHumanDate(date1, date2){ | |
if (date1.getDate() === date2.getDate() && | |
date1.getFullYear() === date2.getFullYear() && | |
date1.getMonth() === date2.getMonth() | |
){ | |
return true; | |
} | |
else { | |
return false; | |
} | |
} | |
/* | |
* Gets value of field in object | |
* | |
* @param {Object} obj | |
* @param {String} field - ex: 'effective' or 'rate.effective' | |
* | |
* @return {Object} value of field | |
*/ | |
function getValue(obj, field){ | |
var properties = field.split('.'); | |
var internal = obj; | |
for(var p = 0; p < properties.length; p++){ | |
internal = internal[properties[p]]; | |
} | |
return internal; | |
} | |
/* | |
* Checks if delta array is valid | |
* | |
* @param {Array} deltas | |
* @param {String} field | |
* | |
* @return {Boolean} | |
*/ | |
function valid(deltas, field){ | |
if (deltas.length > 1) { | |
for (var i=0; i < deltas.length-1; i++) { | |
for (var j = i+1; j < deltas.length; j++) { | |
var i_date = getValue(deltas[i], field), | |
j_date = getValue(deltas[j], field); | |
// ensure no deltas have same date (mm/dd/yyyy) | |
if (dateService.sameHumanDate(i_date, j_date)) return false; | |
} | |
} | |
} | |
return true; | |
} | |
/* | |
* Find effective delta for a given date | |
* | |
* @param {Date} date | |
* @param {Array} deltas | |
* @param {String} field | |
* | |
* @return {Object} | |
*/ | |
function find(date, deltas, field){ | |
if(deltas.length === 0) return null; | |
// sort deltas by ascending date | |
deltas.sort(function(a, b){ | |
return getValue(a, field).getTime() - getValue(b, field).getTime(); | |
}); | |
// special case where no effective delta | |
if(getValue(deltas[0], field) > date) return null; | |
// find most effective delta | |
for(var r = 1; r < deltas.length; r++){ | |
var _deltaDate = getValue(deltas[r], field); | |
if(dateService.sameHumanDate(_deltaDate, date)) return deltas[r]; | |
if(_deltaDate > date) return deltas[r-1]; | |
} | |
// if no deltas end effective period, return last | |
return deltas[deltas.length - 1]; | |
} | |
exports.valid = valid; | |
exports.find = find; | |
exports.sameHumanDate = sameHumanDate; |
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