@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
68 lines • 3.53 kB
JavaScript
;
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* 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.
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.MathInputField = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const ParamInputField_1 = require("../ParamInputField");
class MathInputField extends ParamInputField_1.ParamInputField {
constructor({ attribute, attachedTo, inputValue, operation, }) {
super({ attribute, attachedTo, inputValue });
this.operation = operation;
if (operation == "divide" && inputValue === 0) {
throw new Error("Division by zero is not supported");
}
}
getChildren() {
return [];
}
getSubqueries(queryASTContext) {
const prop = this.getLeftExpression(queryASTContext);
const bitSize = this.attribute.typeHelper.isInt() ? 32 : 64;
const rightExpr = this.getRightExpression(queryASTContext);
// Avoid overflows, for 64 bit overflows, a long overflow is raised anyway by Neo4j
const maxBit = cypher_builder_1.default.minus(cypher_builder_1.default.pow(new cypher_builder_1.default.Literal(2), new cypher_builder_1.default.Literal(bitSize - 1)), new cypher_builder_1.default.Literal(1));
return [
cypher_builder_1.default.utils.concat(cypher_builder_1.default.apoc.util.validate(cypher_builder_1.default.isNull(prop), "Cannot %s %s to Nan", new cypher_builder_1.default.List([new cypher_builder_1.default.Literal(this.operation), this.getParam()])), cypher_builder_1.default.apoc.util.validate(cypher_builder_1.default.gt(rightExpr, maxBit), "Overflow: Value returned from operator %s is larger than %s bit", new cypher_builder_1.default.List([new cypher_builder_1.default.Literal(this.operation), new cypher_builder_1.default.Literal(bitSize)]))),
];
}
getRightExpression(queryASTContext) {
const rightVariable = super.getRightExpression(queryASTContext);
const targetProperty = this.getLeftExpression(queryASTContext);
switch (this.operation) {
case "add":
case "increment":
return cypher_builder_1.default.plus(targetProperty, rightVariable);
case "decrement":
case "subtract":
return cypher_builder_1.default.minus(targetProperty, rightVariable);
case "divide":
return cypher_builder_1.default.divide(targetProperty, rightVariable);
case "multiply":
return cypher_builder_1.default.multiply(targetProperty, rightVariable);
default:
throw new Error(`Unknown operation ${this.operation}`);
}
}
}
exports.MathInputField = MathInputField;
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