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122 lines
3.5 KiB
JavaScript
122 lines
3.5 KiB
JavaScript
/*
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* Copyright DataStax, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* Contains a set of methods to represent a row into a document and a document into a row.
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* @alias module:mapping~TableMappings
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* @interface
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*/
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class TableMappings {
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/**
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* Method that is called by the mapper to create the instance of the document.
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* @return {Object}
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*/
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newObjectInstance() {
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return {};
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}
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/**
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* Gets the name of the column based on the document property name.
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* @param {String} propName The name of the property.
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* @returns {String}
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*/
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getColumnName(propName) {
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return propName;
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}
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/**
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* Gets the name of the document property based on the column name.
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* @param {String} columnName The name of the column.
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* @returns {String}
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*/
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getPropertyName(columnName) {
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return columnName;
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}
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}
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/**
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* A [TableMappings]{@link module:mapping~TableMappings} implementation that converts CQL column names in all-lowercase
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* identifiers with underscores (snake case) to camel case (initial lowercase letter) property names.
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* <p>
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* The conversion is performed without any checks for the source format, you should make sure that the source
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* format is snake case for CQL identifiers and camel case for properties.
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* </p>
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* @alias module:mapping~UnderscoreCqlToCamelCaseMappings
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* @implements {module:mapping~TableMappings}
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*/
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class UnderscoreCqlToCamelCaseMappings extends TableMappings {
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/**
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* Creates a new instance of {@link UnderscoreCqlToCamelCaseMappings}
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*/
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constructor() {
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super();
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}
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/**
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* Converts a property name in camel case to snake case.
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* @param {String} propName Name of the property to convert to snake case.
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* @return {String}
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*/
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getColumnName(propName) {
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return propName.replace(/[a-z][A-Z]/g, (match, offset) => match.charAt(0) + '_' + match.charAt(1)).toLowerCase();
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}
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/**
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* Converts a column name in snake case to camel case.
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* @param {String} columnName The column name to convert to camel case.
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* @return {String}
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*/
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getPropertyName(columnName) {
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return columnName.replace(/_[a-z]/g, (match, offset) => ((offset === 0) ? match : match.substr(1).toUpperCase()));
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}
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}
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/**
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* Default implementation of [TableMappings]{@link module:mapping~TableMappings} that doesn't perform any conversion.
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* @alias module:mapping~DefaultTableMappings
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* @implements {module:mapping~TableMappings}
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*/
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class DefaultTableMappings extends TableMappings {
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/**
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* Creates a new instance of {@link DefaultTableMappings}.
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*/
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constructor() {
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super();
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}
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/** @override */
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getColumnName(propName) {
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return super.getColumnName(propName);
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}
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/** @override */
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getPropertyName(columnName) {
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return super.getPropertyName(columnName);
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}
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/**
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* Creates a new object instance, using object initializer.
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*/
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newObjectInstance() {
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return super.newObjectInstance();
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}
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}
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exports.TableMappings = TableMappings;
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exports.UnderscoreCqlToCamelCaseMappings = UnderscoreCqlToCamelCaseMappings;
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exports.DefaultTableMappings = DefaultTableMappings; |