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* WikiLambda Row class
*
* @copyright 2020– Abstract Wikipedia team; see AUTHORS.txt
* @license MIT
*/
'use strict';
const Constants = require( '../../Constants.js' );
/**
* Row class represents one table entry or row in the ZObject
* flat table representation in the store. The root zobject being
* viewed or altered is flattened into a table on initialization
* and represented as an array of Row objects.
*
* @class
* @property {number} id Numerical unique row identifier;
* @property {string} key String value of the key that identifies this node, string
* value of the numerical index if this row represents a list item;
* @property {string} value String value if the node is terminal or type of value
* this node is the parent of if not terminal;
* @property {number} parentId The row identifier of this row's parent
*/
class Row {
constructor( id, key, value, parent ) {
this.id = id;
this.key = key;
this.parent = parent;
this.value = value;
}
/**
* Returns whether the row represents a terminal node.
*
* @return {boolean}
*/
isTerminal() {
return ( ( typeof this.value === 'string' ) &&
( this.value !== Constants.ROW_VALUE_OBJECT ) &&
( this.value !== Constants.ROW_VALUE_ARRAY ) );
}
/**
* Returns whether the row represents the parent node
* of an array.
*
* @return {boolean}
*/
isArray() {
return ( this.value === Constants.ROW_VALUE_ARRAY );
}
/**
* Returns whether the row represents the parent node
* of an object.
*
* @return {boolean}
*/
isObject() {
return ( this.value === Constants.ROW_VALUE_OBJECT );
}
}
module.exports = exports = Row;
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