excel-builder/src/Excel/RelationshipManager.js

An easy way of building Excel files with javascript

"use strict";
var _ = require('lodash');
var util = require('./util');
var Paths = require('./Paths');


/**
 * @module Excel/RelationshipManager
 */
var RelationshipManager = function () {
    this.relations = {};
    this.lastId = 1;
};

_.uniqueId('rId'); //priming

_.extend(RelationshipManager.prototype, {

    importData: function (data) {
        this.relations = data.relations;
        this.lastId = data.lastId;
    },
    exportData: function () {
        return {
            relations: this.relations,
            lastId: this.lastId
        };
    },

    addRelation: function (object, type) {
        this.relations[object.id] = {
            id: _.uniqueId('rId'),
            schema: util.schemas[type],
            object: object
        };
        return this.relations[object.id].id;
    },

    getRelationshipId: function (object) {
        return this.relations[object.id] ? this.relations[object.id].id : null;
    },

    toXML: function () {
        var doc = util.createXmlDoc(util.schemas.relationshipPackage, 'Relationships');
        var relationships = doc.documentElement;

        _.each(this.relations, function (data, id) {
            var relationship = util.createElement(doc, 'Relationship', [
                ['Id', data.id],
                ['Type', data.schema],
                ['Target', data.object.target || Paths[id]]
            ]);
            data.object.targetMode && relationship.setAttribute('TargetMode', data.object.targetMode);
            relationships.appendChild(relationship);
        });
        return doc;
    }
});
    
module.exports = RelationshipManager;