gremlin_patch
Version:
JavaScript Gremlin Language Variant
324 lines (284 loc) • 11.3 kB
JavaScript
/*
* 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
*/
;
const Traversal = require('./traversal').Traversal;
class TraversalStrategies {
/**
* Creates a new instance of TraversalStrategies.
* @param {TraversalStrategies} [parent] The parent strategies from where to clone the values from.
* @constructor
*/
constructor(parent) {
if (parent) {
// Clone the strategies
this.strategies = [...parent.strategies];
}
else {
this.strategies = [];
}
}
/** @param {TraversalStrategy} strategy */
addStrategy(strategy) {
this.strategies.push(strategy);
}
/** @param {TraversalStrategy} strategy */
removeStrategy(strategy) {
const idx = this.strategies.findIndex(s => s.fqcn === strategy.fqcn);
if (idx !== -1) {
return this.strategies.splice(idx, 1)[0];
}
return undefined;
}
/**
* @param {Traversal} traversal
* @returns {Promise}
*/
applyStrategies(traversal) {
// Apply all strategies serially
return this.strategies.reduce((promise, strategy) => {
return promise.then(() => strategy.apply(traversal));
}, Promise.resolve());
}
}
/** @abstract */
class TraversalStrategy {
/**
* @param {String} fqcn fully qualified class name in Java of the strategy
* @param {Object} configuration for the strategy
*/
constructor(fqcn, configuration = {}) {
this.fqcn = fqcn;
this.configuration = configuration;
}
/**
* @abstract
* @param {Traversal} traversal
* @returns {Promise}
*/
apply(traversal) {
}
}
class ConnectiveStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.ConnectiveStrategy");
}
}
class ElementIdStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.ElementIdStrategy");
}
}
class HaltedTraverserStrategy extends TraversalStrategy {
/**
* @param {String} haltedTraverserFactory full qualified class name in Java of a {@code HaltedTraverserFactory} implementation
*/
constructor(haltedTraverserFactory) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.HaltedTraverserStrategy");
if (haltedTraverserFactory !== undefined)
this.configuration["haltedTraverserFactory"] = haltedTraverserFactory;
}
}
class OptionsStrategy extends TraversalStrategy {
constructor(options) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.OptionsStrategy", options);
}
}
class PartitionStrategy extends TraversalStrategy {
/**
* @param {Object} [options]
* @param {String} [options.partitionKey] name of the property key to partition by
* @param {String} [options.writePartition] the value of the currently write partition
* @param {Array<String>} [options.readPartitions] list of strings representing the partitions to include for reads
* @param {boolean} [options.includeMetaProperties] determines if meta-properties should be included in partitioning defaulting to false
*/
constructor(options) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.PartitionStrategy", options);
}
}
class SubgraphStrategy extends TraversalStrategy {
/**
* @param {Object} [options]
* @param {GraphTraversal} [options.vertices] name of the property key to partition by
* @param {GraphTraversal} [options.edges] the value of the currently write partition
* @param {GraphTraversal} [options.vertexProperties] list of strings representing the partitions to include for reads
* @param {boolean} [options.checkAdjacentVertices] enables the strategy to apply the {@code vertices} filter to the adjacent vertices of an edge.
*/
constructor(options) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.SubgraphStrategy", options);
if (this.configuration.vertices instanceof Traversal)
this.configuration.vertices = this.configuration.vertices.bytecode;
if (this.configuration.edges instanceof Traversal)
this.configuration.edges = this.configuration.edges.bytecode;
if (this.configuration.vertexProperties instanceof Traversal)
this.configuration.vertexProperties = this.configuration.vertexProperties.bytecode;
}
}
class VertexProgramStrategy extends TraversalStrategy {
constructor(options) {
super("org.apache.tinkerpop.gremlin.process.computer.traversal.strategy.decoration.VertexProgramStrategy", options);
}
}
class MatchAlgorithmStrategy extends TraversalStrategy {
/**
* @param matchAlgorithm
*/
constructor(matchAlgorithm) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.finalization.MatchAlgorithmStrategy");
if (matchAlgorithm !== undefined)
this.configuration["matchAlgorithm"] = matchAlgorithm;
}
}
class AdjacentToIncidentStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.AdjacentToIncidentStrategy");
}
}
class FilterRankingStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.FilterRankingStrategy");
}
}
class IdentityRemovalStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.IdentityRemovalStrategy");
}
}
class IncidentToAdjacentStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.IncidentToAdjacentStrategy");
}
}
class InlineFilterStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.InlineFilterStrategy");
}
}
class LazyBarrierStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.LazyBarrierStrategy");
}
}
class MatchPredicateStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.MatchPredicateStrategy");
}
}
class OrderLimitStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.OrderLimitStrategy");
}
}
class PathProcessorStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy");
}
}
class PathRetractionStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathRetractionStrategy");
}
}
class CountStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy");
}
}
class RepeatUnrollStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.RepeatUnrollStrategy");
}
}
class GraphFilterStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.GraphFilterStrategy");
}
}
class EarlyLimitStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.EarlyLimitStrategy");
}
}
class LambdaRestrictionStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy");
}
}
class ReadOnlyStrategy extends TraversalStrategy {
constructor() {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy");
}
}
class EdgeLabelVerificationStrategy extends TraversalStrategy {
/**
* @param {boolean} logWarnings determines if warnings should be written to the logger when verification fails
* @param {boolean} throwException determines if exceptions should be thrown when verifications fails
*/
constructor(logWarnings = false, throwException=false) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy",
{logWarnings: logWarnings, throwException: throwException});
}
}
class ReservedKeysVerificationStrategy extends TraversalStrategy {
/**
* @param {boolean} logWarnings determines if warnings should be written to the logger when verification fails
* @param {boolean} throwException determines if exceptions should be thrown when verifications fails
* @param {Array<String>} keys the list of reserved keys to verify
*/
constructor(logWarnings = false, throwException=false, keys=["id", "label"]) {
super("org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy",
{logWarnings: logWarnings, throwException: throwException, keys: keys});
}
}
module.exports = {
TraversalStrategies: TraversalStrategies,
TraversalStrategy: TraversalStrategy,
// decoration
ConnectiveStrategy: ConnectiveStrategy,
ElementIdStrategy: ElementIdStrategy,
HaltedTraverserStrategy: HaltedTraverserStrategy,
OptionsStrategy: OptionsStrategy,
PartitionStrategy: PartitionStrategy,
SubgraphStrategy: SubgraphStrategy,
VertexProgramStrategy: VertexProgramStrategy,
// finalization
MatchAlgorithmStrategy: MatchAlgorithmStrategy,
// optimization
AdjacentToIncidentStrategy: AdjacentToIncidentStrategy,
FilterRankingStrategy: FilterRankingStrategy,
IdentityRemovalStrategy: IdentityRemovalStrategy,
IncidentToAdjacentStrategy: IncidentToAdjacentStrategy,
InlineFilterStrategy: InlineFilterStrategy,
LazyBarrierStrategy: LazyBarrierStrategy,
MatchPredicateStrategy: MatchPredicateStrategy,
OrderLimitStrategy: OrderLimitStrategy,
PathProcessorStrategy: PathProcessorStrategy,
PathRetractionStrategy: PathRetractionStrategy,
CountStrategy: CountStrategy,
RepeatUnrollStrategy: RepeatUnrollStrategy,
GraphFilterStrategy: GraphFilterStrategy,
EarlyLimitStrategy: EarlyLimitStrategy,
// verification
EdgeLabelVerificationStrategy: EdgeLabelVerificationStrategy,
LambdaRestrictionStrategy: LambdaRestrictionStrategy,
ReadOnlyStrategy: ReadOnlyStrategy,
ReservedKeysVerificationStrategy: ReservedKeysVerificationStrategy
};