| /* |
| * 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. |
| */ |
| |
| package org.apache.tinkerpop.gremlin.process.traversal.translator; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.commons.text.StringEscapeUtils; |
| import org.apache.tinkerpop.gremlin.process.traversal.Bytecode; |
| import org.apache.tinkerpop.gremlin.process.traversal.P; |
| import org.apache.tinkerpop.gremlin.process.traversal.Pick; |
| import org.apache.tinkerpop.gremlin.process.traversal.SackFunctions; |
| import org.apache.tinkerpop.gremlin.process.traversal.Script; |
| import org.apache.tinkerpop.gremlin.process.traversal.TextP; |
| import org.apache.tinkerpop.gremlin.process.traversal.Translator; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy; |
| import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource; |
| import org.apache.tinkerpop.gremlin.process.traversal.strategy.TraversalStrategyProxy; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.ConnectiveP; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.OrP; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.apache.tinkerpop.gremlin.structure.VertexProperty; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| import org.apache.tinkerpop.gremlin.util.NumberHelper; |
| import org.apache.tinkerpop.gremlin.util.function.Lambda; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| |
| import java.sql.Timestamp; |
| import java.util.Date; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.UUID; |
| |
| /** |
| * Translates Gremlin {@link Bytecode} into a Golang string representation. |
| * |
| * @author Simon Zhao (simonz@bitquilltech.com) |
| */ |
| public final class GolangTranslator implements Translator.ScriptTranslator { |
| private final String traversalSource; |
| private final TypeTranslator typeTranslator; |
| private final static String GO_PACKAGE_NAME = "gremlingo."; |
| |
| private GolangTranslator(final String traversalSource, final TypeTranslator typeTranslator) { |
| this.traversalSource = traversalSource; |
| this.typeTranslator = typeTranslator; |
| } |
| |
| /** |
| * Creates the translator with a {@code false} argument to {@code withParameters} using |
| * {@link #of(String, boolean)}. |
| */ |
| public static GolangTranslator of(final String traversalSource) { |
| return of(traversalSource, false); |
| } |
| |
| /** |
| * Creates the translator with the {@link DefaultTypeTranslator} passing the {@code withParameters} option to it |
| * which will handle type translation in a fashion that should typically increase cache hits and reduce |
| * compilation times if enabled at the sacrifice to rewriting of the script that could reduce readability. |
| */ |
| public static GolangTranslator of(final String traversalSource, final boolean withParameters) { |
| return of(traversalSource, new DefaultTypeTranslator(withParameters)); |
| } |
| |
| /** |
| * Creates the translator with a custom {@link TypeTranslator} instance. |
| */ |
| public static GolangTranslator of(final String traversalSource, final TypeTranslator typeTranslator) { |
| return new GolangTranslator(traversalSource, typeTranslator); |
| } |
| |
| @Override |
| public String getTraversalSource() { |
| return this.traversalSource; |
| } |
| |
| @Override |
| public Script translate(final Bytecode bytecode) { |
| return typeTranslator.apply(traversalSource, bytecode); |
| } |
| |
| @Override |
| public String getTargetLanguage() { |
| return "gremlin-go"; |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.translatorString(this); |
| } |
| |
| /** |
| * Performs standard type translation for the TinkerPop types to Go. |
| */ |
| public static class DefaultTypeTranslator extends AbstractTypeTranslator { |
| |
| public DefaultTypeTranslator(final boolean withParameters) { |
| super(withParameters); |
| } |
| |
| @Override |
| protected String getNullSyntax() { |
| return "nil"; |
| } |
| |
| @Override |
| protected String getSyntax(final String o) { |
| return "\"" + StringEscapeUtils.escapeJava(o) + "\""; |
| } |
| |
| @Override |
| protected String getSyntax(final Boolean o) { |
| return o.toString(); |
| } |
| |
| @Override |
| protected String getSyntax(final Date o) { |
| return "time.UnixMilli(" + o.getTime() + ")"; |
| } |
| |
| @Override |
| protected String getSyntax(final Timestamp o) { |
| return "time.UnixMilli(" + o.getTime() + ")"; |
| } |
| |
| @Override |
| protected String getSyntax(final UUID o) { |
| return "uuid.MustParse(\"" + o.toString() + "\")"; |
| } |
| |
| @Override |
| protected String getSyntax(final Lambda o) { |
| return "&gremlingo.Lambda{Script:\"" + o.getLambdaScript().trim() + "\", Language:\"\"}"; |
| } |
| |
| @Override |
| protected String getSyntax(final Number o) { |
| if (o instanceof Float || o instanceof Double) { |
| if (NumberHelper.isNaN(o)) |
| return "math.NaN()"; |
| else if (NumberHelper.isPositiveInfinity(o)) |
| return "math.Inf(1)"; |
| else if (NumberHelper.isNegativeInfinity(o)) |
| return "math.Inf(-11)"; |
| } |
| return o.toString(); |
| } |
| |
| @Override |
| protected String getSyntax(final SackFunctions.Barrier o) { |
| return GO_PACKAGE_NAME + "Barrier." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected String getSyntax(final VertexProperty.Cardinality o) { |
| return GO_PACKAGE_NAME + "Cardinality." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected String getSyntax(final Pick o) { |
| return GO_PACKAGE_NAME + "Pick." + resolveSymbol(o.toString()); |
| } |
| |
| @Override |
| protected Script produceCardinalityValue(final Bytecode o) { |
| final Bytecode.Instruction inst = o.getSourceInstructions().get(0); |
| final String card = inst.getArguments()[0].toString(); |
| script.append(GO_PACKAGE_NAME + "CardinalityValue." + card.substring(0, 1).toUpperCase() + card.substring(1) + "("); |
| convertToScript(inst.getArguments()[1]); |
| script.append(")"); |
| return script; |
| } |
| |
| @Override |
| protected Script produceScript(final Set<?> o) { |
| final Iterator<?> iterator = o.iterator(); |
| script.append(GO_PACKAGE_NAME + "NewSimpleSet("); |
| while(iterator.hasNext()) { |
| convertToScript(iterator.next()); |
| if (iterator.hasNext()) |
| script.append(", "); |
| } |
| return script.append(")"); |
| } |
| |
| @Override |
| protected Script produceScript(final List<?> o) { |
| final Iterator<?> iterator = o.iterator(); |
| script.append("[]interface{}{"); |
| while(iterator.hasNext()) { |
| convertToScript(iterator.next()); |
| if (iterator.hasNext()) |
| script.append(", "); |
| } |
| script.append("}"); |
| return script; |
| } |
| |
| @Override |
| protected Script produceScript(final Map<?, ?> o) { |
| script.append("map[interface{}]interface{}{"); |
| final Iterator<? extends Map.Entry<?, ?>> itty = o.entrySet().iterator(); |
| while (itty.hasNext()) { |
| final Map.Entry<?,?> entry = itty.next(); |
| convertToScript(entry.getKey()).append(": "); |
| convertToScript(entry.getValue()); |
| if (itty.hasNext()) |
| script.append(", "); |
| } |
| return script.append("}"); |
| } |
| |
| @Override |
| protected Script produceScript(final Class<?> o) { |
| return script.append(o.getCanonicalName()); |
| } |
| |
| @Override |
| protected Script produceScript(final Enum<?> o) { |
| return script.append(GO_PACKAGE_NAME + o.getDeclaringClass().getSimpleName() + "." + resolveSymbol(o.toString())); |
| } |
| |
| @Override |
| protected Script produceScript(final Vertex o) { |
| script.append(GO_PACKAGE_NAME + "Vertex{Element{"); |
| convertToScript(o.id()).append(", "); |
| return convertToScript(o.label()).append("}}"); |
| } |
| |
| @Override |
| protected Script produceScript(final Edge o) { |
| script.append(GO_PACKAGE_NAME + "Edge{Element{"); |
| convertToScript(o.id()).append(", "); |
| convertToScript(o.label()).append("}, "); |
| convertToScript(o.outVertex()).append(","); |
| return convertToScript(o.inVertex()).append("}"); |
| } |
| |
| @Override |
| protected Script produceScript(final VertexProperty<?> o) { |
| script.append(GO_PACKAGE_NAME + "VertexProperty{"); |
| convertToScript(o.id()).append(", "); |
| convertToScript(o.label()).append("}, "); |
| return convertToScript(o.value()).append("}"); |
| } |
| |
| @Override |
| protected Script produceScript(final TraversalStrategyProxy<?> o) { |
| if (o.getConfiguration().isEmpty()) { |
| return script.append(GO_PACKAGE_NAME + o.getStrategyClass().getSimpleName() + "()"); |
| } else { |
| script.append(GO_PACKAGE_NAME + o.getStrategyClass().getSimpleName() + "("); |
| script.append(GO_PACKAGE_NAME + o.getStrategyClass().getSimpleName() + "Config{"); |
| final Iterator<String> keys = IteratorUtils.stream(o.getConfiguration().getKeys()). |
| filter(e -> !e.equals(TraversalStrategy.STRATEGY)).iterator(); |
| while (keys.hasNext()) { |
| final String k = keys.next(); |
| script.append(SymbolHelper.toGolang(k)); |
| script.append(": "); |
| |
| if (o.getConfiguration().getProperty(k) instanceof List) { |
| List<Object> list =(List<Object>) o.getConfiguration().getProperty(k); |
| Iterator iterator = list.iterator(); |
| script.append("[]string{"); |
| while(iterator.hasNext()) { |
| convertToScript(iterator.next()); |
| if (iterator.hasNext()) |
| script.append(", "); |
| } |
| script.append("}"); |
| } else if (o.getConfiguration().getProperty(k) == null) { |
| script.append("nil"); |
| } else { |
| convertToScript(o.getConfiguration().getProperty(k)); |
| } |
| if (keys.hasNext()) |
| script.append(", "); |
| } |
| return script.append("})"); |
| } |
| } |
| |
| @Override |
| protected Script produceScript(final String traversalSource, final Bytecode o) { |
| final String source = traversalSource.equals("__") ? GO_PACKAGE_NAME + "T__" : traversalSource; |
| script.append(source); |
| for (final Bytecode.Instruction instruction : o.getInstructions()) { |
| final String methodName = instruction.getOperator(); |
| final Object[] arguments = instruction.getArguments(); |
| |
| if (methodName.equals(GraphTraversalSource.Symbols.tx)) { |
| final String command = resolveSymbol(arguments[0].toString()); |
| script.append(".").append(resolveSymbol(methodName)).append("().").append(resolveSymbol(command)).append("()"); |
| } else { |
| script.append(".").append(resolveSymbol(methodName)).append("("); |
| |
| for (int i = 0; i < arguments.length; i++) { |
| convertToScript(arguments[i]); |
| if (i != arguments.length - 1) { |
| script.append(", "); |
| } |
| } |
| |
| script.append(")"); |
| } |
| } |
| return script; |
| } |
| |
| @Override |
| protected Script produceScript(final P<?> p) { |
| if (p instanceof TextP) { |
| script.append(GO_PACKAGE_NAME + "TextP.").append(resolveSymbol(p.getPredicateName())).append("("); |
| convertToScript(p.getValue()); |
| } else if (p instanceof ConnectiveP) { |
| // ConnectiveP gets some special handling because it's reduced to and(P, P, P) and we want it |
| // generated the way it was written which was P.and(P).and(P) |
| final List<P<?>> list = ((ConnectiveP) p).getPredicates(); |
| final String connector = p instanceof OrP ? "Or" : "And"; |
| for (int i = 0; i < list.size(); i++) { |
| produceScript(list.get(i)); |
| |
| // For the first/last P there is no parent to close. |
| if (i > 0 && i < list.size() - 1) { |
| script.append(")"); |
| } |
| |
| // Add the connector for all but last P. |
| if (i < list.size() - 1) { |
| script.append(".").append(connector).append("("); |
| } |
| } |
| } else { |
| script.append(GO_PACKAGE_NAME + "P.").append(resolveSymbol(p.getPredicateName())).append("("); |
| convertToScript(p.getValue()); |
| } |
| script.append(")"); |
| return script; |
| } |
| |
| protected String resolveSymbol(final String methodName) { |
| return SymbolHelper.toGolang(methodName); |
| } |
| } |
| |
| static final class SymbolHelper { |
| |
| private final static Map<String, String> TO_GO_MAP = new HashMap<>(); |
| private final static Map<String, String> FROM_GO_MAP = new HashMap<>(); |
| |
| static { |
| TO_GO_MAP.put("OUT", "Out"); |
| TO_GO_MAP.put("IN", "In"); |
| TO_GO_MAP.put("BOTH", "Both"); |
| TO_GO_MAP.forEach((k, v) -> FROM_GO_MAP.put(v, k)); |
| } |
| |
| private SymbolHelper() { |
| // static methods only, do not instantiate |
| } |
| |
| public static String toGolang(final String symbol) { |
| return TO_GO_MAP.getOrDefault(symbol, StringUtils.capitalize(symbol)); |
| } |
| |
| public static String toJava(final String symbol) { |
| return FROM_GO_MAP.getOrDefault(symbol, StringUtils.uncapitalize(symbol)); |
| } |
| |
| } |
| } |