/* * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ 'use strict'; const IllegalModelException = require('../introspect/illegalmodelexception'); /** * Predicate captures a conditional Javascript expression: * anything that can legally appear within a if statement. * * @private * @class * @memberof module:composer-common */ class Predicate { /** * Create an Predicate from an Abstract Syntax Tree. The AST is the * result of parsing. * * @param {AclRule} aclRule - the AclRule for this Predicate * @param {Object} ast - the AST created by the parser * @throws {IllegalModelException} */ constructor(aclRule, ast) { if(!aclRule || !ast) { throw new IllegalModelException('Invalid AclRule or AST'); } this.expression = ast; this.aclRule = aclRule; this.process(); } /** * Visitor design pattern * @param {Object} visitor - the visitor * @param {Object} parameters - the parameter * @return {Object} the result of visiting or null * @private */ accept(visitor,parameters) { return visitor.visit(this, parameters); } /** * Returns the AclRule that owns this ModelBinding. * * @return {AclRule} the owning AclRule */ getAclRule() { return this.aclRule; } /** * Returns the expression as a text string. * * @return {string} the operator for the predicate */ getExpression() { return this.expression; } /** * Process the AST and build the model * * @throws {InvalidModelException} * @private */ process() { } /** * Semantic validation of the structure of this ModelBinding. * * @throws {InvalidModelException} * @private */ validate() { } /** * Returns a new object representing this function declaration that is * suitable for serializing as JSON. * @return {Object} A new object suitable for serializing as JSON. */ toJSON() { let result = { expression: this.expression, }; return result; } } module.exports = Predicate;