/
comparison.js
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/
comparison.js
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var utils = require('utilities')
, datatypes = require('../datatypes')
, comparison = {}
, ComparisonBase
, comparisonTypes;
comparison.create = function () {
var args = Array.prototype.slice.call(arguments)
, type = args.shift()
, ctor = utils.string.capitalize(type) + 'Comparison'
, inst;
ctor = comparisonTypes[ctor];
inst = new ctor();
inst.type = type;
inst.initialize.apply(inst, args);
return inst;
};
ComparisonBase = function () {
this.initialize = function (field, value, datatype, opts) {
this.parent = null;
this.descendants = [];
this.field = field;
this.value = value;
// FIXME: Should use Property objects
this.datatype = datatype;
this.opts = opts || {};
};
};
comparisonTypes = {
EqualToComparison: function () {
this.comparatorString = '=';
}
, NotEqualToComparison: function () {
this.comparatorString = '!=';
}
, InclusionComparison: function () {
this.comparatorString = 'IN';
}
, LikeComparison: function () {
this.comparatorString = 'LIKE';
}
, GreaterThanComparison: function () {
this.comparatorString = '>';
}
, LessThanComparison: function () {
this.comparatorString = '<';
}
, GreaterThanOrEqualComparison: function () {
this.comparatorString = '>=';
}
, LessThanOrEqualComparison: function () {
this.comparatorString = '<=';
}
};
(function () {
var ctor;
for (var t in comparisonTypes) {
ctor = comparisonTypes[t];
ctor.prototype = new ComparisonBase();
ctor.prototype.constructor = ctor;
}
})();
// Export the specific constructors as well as the `create` function
utils.mixin(comparison, comparisonTypes);
module.exports = comparison;