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packages/concerto-tools/lib/codegen/fromcto/jsonschema/recursionvisitor.js
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| 'use strict'; | ||
|
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| const ClassDeclaration = require('@accordproject/concerto-core').ClassDeclaration; | ||
| const EnumDeclaration = require('@accordproject/concerto-core').EnumDeclaration; | ||
| const Field = require('@accordproject/concerto-core').Field; | ||
| const RelationshipDeclaration = require('@accordproject/concerto-core').RelationshipDeclaration; | ||
| const debug = require('debug')('concerto-core:recursiondetectionvisitor'); | ||
| const util = require('util'); | ||
|
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| /** | ||
| * Detects whether ClassDeclaration contains recursive references. | ||
| * Basic example: | ||
| * concept Person { | ||
| * o Person[] children | ||
| * } | ||
| * | ||
| * parameters.stack should be initialized to [] | ||
| * @private | ||
| * @class | ||
| * @memberof module:concerto-tools | ||
| */ | ||
| class RecursionDetectionVisitor { | ||
|
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| /** | ||
| * Visitor design pattern | ||
| * @param {Object} thing - the object being visited | ||
| * @param {Object} parameters - the parameter | ||
| * @return {Object} the result of visiting or null | ||
| * @private | ||
| */ | ||
| visit(thing, parameters) { | ||
| // the order of these matters! | ||
| if (thing instanceof EnumDeclaration) { | ||
| return this.visitEnumDeclaration(thing, parameters); | ||
| } | ||
| else if (thing instanceof ClassDeclaration) { | ||
| return this.visitClassDeclaration(thing, parameters); | ||
| } else if (thing instanceof Field) { | ||
| return this.visitField(thing, parameters); | ||
| } else if (thing instanceof RelationshipDeclaration) { | ||
| return this.visitRelationshipDeclaration(thing, parameters); | ||
| } else { | ||
| throw new Error('Unrecognised type: ' + typeof thing + ', value: ' + util.inspect(thing, { showHidden: true, depth: null })); | ||
| } | ||
| } | ||
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| /** | ||
| * Visitor design pattern | ||
| * @param {ClassDeclaration} classDeclaration - the object being visited | ||
| * @param {Object} parameters - the parameter | ||
| * @return {Object} the result of visiting or null | ||
| * @private | ||
| */ | ||
| visitClassDeclaration(classDeclaration, parameters) { | ||
| debug('entering visitClassDeclaration', classDeclaration.getName()); | ||
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| parameters.stack.push(classDeclaration.getFullyQualifiedName()); | ||
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| // Walk over all of the properties of this class and its super classes. | ||
| const properties = classDeclaration.getProperties(); | ||
| for(let n=0; n < properties.length; n++) { | ||
| const property = properties[n]; | ||
| if( property.accept(this, parameters) ) { | ||
| return true; | ||
| } | ||
| } | ||
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| parameters.stack.pop(); | ||
| return false; | ||
| } | ||
|
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| /** | ||
| * Visitor design pattern | ||
| * @param {Field} field - the object being visited | ||
| * @param {Object} parameters - the parameter | ||
| * @return {Object} the result of visiting or null | ||
| * @private | ||
| */ | ||
| visitField(field, parameters) { | ||
| debug('entering visitField', field.getName()); | ||
| if(field.isPrimitive()) { | ||
| return false; | ||
| } | ||
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| let type = field.getParent().getModelFile(). | ||
| getModelManager().getType(field.getFullyQualifiedTypeName()); | ||
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| debug('stack', parameters.stack ); | ||
| if( parameters.stack.includes(type.getFullyQualifiedName()) ) { | ||
| return true; | ||
| } | ||
| else { | ||
| return this.visit(type, parameters); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Visitor design pattern | ||
| * @param {EnumDeclaration} enumDeclaration - the object being visited | ||
| * @param {Object} parameters - the parameter | ||
| * @return {Object} the result of visiting or null | ||
| * @private | ||
| */ | ||
| visitEnumDeclaration(enumDeclaration, parameters) { | ||
| debug('entering visitEnumDeclaration', enumDeclaration.getName()); | ||
| return false; | ||
| } | ||
|
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| /** | ||
| * Visitor design pattern | ||
| * @param {RelationshipDeclaration} relationshipDeclaration - the object being visited | ||
| * @param {Object} parameters - the parameter | ||
| * @return {Object} the result of visiting or null | ||
| * @private | ||
| */ | ||
| visitRelationshipDeclaration(relationshipDeclaration, parameters) { | ||
| debug('entering visitRelationship', relationshipDeclaration.getName()); | ||
| return false; | ||
| } | ||
| } | ||
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| module.exports = RecursionDetectionVisitor; |
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