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August 29, 2015 14:23
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Simple model to keep orthogonal representation of data in sync
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class OrthogonalData { | |
constructor() { | |
this._cols = null; // object of arrays | |
this._rows = null; // array of objects | |
} | |
// verify that data are consistents | |
_checkConsistency() { | |
let size = null; | |
for (let key in this._cols) { | |
const col = this._cols[key]; | |
const colLength = col.length; | |
if (size !== null && size !== colLength) { | |
throw new Error(`${this.__proto__.constructor.name}: inconsistent data`); | |
} else if (size === null) { | |
size = colLength; | |
} | |
} | |
} | |
updateFromCols() { | |
let keys = Object.keys(this._cols); | |
keys.forEach((key, i) => { | |
const col = this._cols[key]; | |
col.forEach((value, index) => { | |
if (this._rows[index] === undefined) this._rows[index] = {}; | |
this._rows[index][key] = value; | |
}); | |
}); | |
this._checkConsistency(); | |
} | |
updateFromRows() { | |
this._rows.forEach((obj, index) => { | |
for (let key in obj) { | |
if (index === 0) this._cols[key] = []; | |
this._cols[key].push(obj[key]); | |
} | |
}); | |
this._checkConsistency(); | |
} | |
set cols(obj) { | |
this._cols = obj; | |
this._rows = []; | |
this.updateFromCols(); | |
} | |
set rows(arr) { | |
this._rows = arr; | |
this._cols = {}; | |
this.updateFromRows(); | |
} | |
get cols() { | |
return this._cols; | |
} | |
get rows() { | |
return this._rows; | |
} | |
} |
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