gremlin
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JavaScript Gremlin Language Variant
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<h1 class="page-title">Source: process/bytecode.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/**
* @author Jorge Bay Gondra
*/
'use strict';
const { Traversal } = require('./traversal');
class Bytecode {
/**
* Creates a new instance of Bytecode
* @param {Bytecode} [toClone]
*/
constructor(toClone) {
if (!toClone) {
this.sourceInstructions = [];
this.stepInstructions = [];
} else {
this.sourceInstructions = [...toClone.sourceInstructions];
this.stepInstructions = [...toClone.stepInstructions];
}
}
/**
* Adds a new source instructions
* @param {String} name
* @param {Array} values
* @returns {Bytecode}
*/
addSource(name, values) {
if (name === undefined) {
throw new Error('Name is not defined');
}
const instruction = new Array(values.length + 1);
instruction[0] = name;
for (let i = 0; i < values.length; ++i) {
instruction[i + 1] = values[i];
}
this.sourceInstructions.push(Bytecode._generateInstruction(name, values));
return this;
}
/**
* Adds a new step instructions
* @param {String} name
* @param {Array} values
* @returns {Bytecode}
*/
addStep(name, values) {
if (name === undefined) {
throw new Error('Name is not defined');
}
this.stepInstructions.push(Bytecode._generateInstruction(name, values));
return this;
}
static _generateInstruction(name, values) {
const length = (values ? values.length : 0) + 1;
const instruction = new Array(length);
instruction[0] = name;
for (let i = 1; i < length; i++) {
const val = values[i - 1];
if (val instanceof Traversal && val.graph != null) {
throw new Error(
`The child traversal of ${val} was not spawned anonymously - use ` +
'the __ class rather than a TraversalSource to construct the child traversal',
);
}
instruction[i] = val;
}
return instruction;
}
/**
* Returns the JSON representation of the source and step instructions
* @returns {String}
*/
toString() {
return JSON.stringify([this.sourceInstructions, this.stepInstructions]);
}
/**
* Adds a new source instructions
* @param {String} name
* @param {Array} values
* @returns {Bytecode}
*/
static _createGraphOp(name, values) {
const bc = new Bytecode();
bc.addSource(name, values);
return bc;
}
/**
* Gets the <code>Bytecode</code> that is meant to be sent as "graph operations" to the server.
* @returns {{rollback: Bytecode, commit: Bytecode}}
*/
static get GraphOp() {
return {
commit: Bytecode._createGraphOp('tx', ['commit']),
rollback: Bytecode._createGraphOp('tx', ['rollback']),
};
}
}
module.exports = Bytecode;
</code></pre>
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