89 lines
2.9 KiB
JavaScript
89 lines
2.9 KiB
JavaScript
/**
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* Instantiate appropriate DataApi
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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var Class = require( 'easejs' ).Class,
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HttpDataApi = require( './http/HttpDataApi' ),
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XhrHttpImpl = require( './http/XhrHttpImpl' ),
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JsonResponse = require( './format/JsonResponse' ),
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RestrictedDataApi = require( './RestrictedDataApi' ),
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StaticAdditionDataApi = require( './StaticAdditionDataApi' ),
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BucketDataApi = require( './BucketDataApi' );
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/**
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* Instantiates the appropriate DataApi object for the givne service type
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*/
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module.exports = Class( 'DataApiFactory',
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{
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/**
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* Return a DataApi instance for the requested service type
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*
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* The source and method have type-specific meaning; that is, "source" may
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* be a URL and "method" may be get/post for a RESTful service.
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*
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* @param {string} type service type (e.g. "rest")
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* @param {Object} desc API description
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*
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* @return {DataApi} appropriate DataApi instance
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*/
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'public fromType': function( type, desc, bucket )
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{
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var api = null,
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source = ( desc.source || '' ),
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method = ( desc.method || '' ),
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static_data = ( desc['static'] || [] ),
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nonempty = !!desc.static_nonempty,
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multiple = !!desc.static_multiple;
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switch ( type )
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{
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case 'rest':
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api = HttpDataApi.use( JsonResponse )(
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source,
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method.toUpperCase(),
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XhrHttpImpl( XMLHttpRequest )
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);
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break;
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case 'local':
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// currently, only local bucket data sources are supported
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if ( source !== 'bucket' )
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{
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throw Error( "Unknown local data API source: " + source );
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}
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api = BucketDataApi( bucket, desc.retvals );
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break;
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default:
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throw Error( 'Unknown data API type: ' + type );
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};
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return RestrictedDataApi(
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StaticAdditionDataApi( api, nonempty, multiple, static_data ),
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desc
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);
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}
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} );
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