53 lines
1.0 KiB
JavaScript
53 lines
1.0 KiB
JavaScript
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var Operation = require ('./operation');
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var Value = require ('./value');
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/**
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* The equivalent of a SQL filter expression. It allows to automatically build
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* SQL filters based on lot parameters.
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*/
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module.exports = new Class
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({
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Extends: Operation
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,Tag: 'sql-filter'
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/**
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* Checks if any of filters childs are ready.
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*/
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,isReady: function (params)
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{
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var exprs = this.exprs;
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for (var i = exprs.length; i--;)
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if (exprs[i].isReady (params))
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return true;
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return false;
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}
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/**
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* Renders the filter as an SQL expression. If any of its childs isn't
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* ready is ommitted from the expression. If all of its childs aren't ready
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* renders the TRUE expression.
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*/
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,render: function (params)
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{
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var newOp;
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var newExprs = [];
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this.exprs.forEach (function (expr) {
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if (expr.isReady (params))
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newExprs.push (expr);
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})
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if (newExprs.length > 0)
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newOp = new Operation ({
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type: this.type,
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exprs: newExprs
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});
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else
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newOp = new Value ({value: true});
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return newOp.render (params);
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}
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});
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