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GroovyTranslator.java
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GroovyTranslator.java
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/*
* 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.java.translator;
import org.apache.tinkerpop.gremlin.process.computer.Computer;
import org.apache.tinkerpop.gremlin.process.traversal.ByteCode;
import org.apache.tinkerpop.gremlin.process.traversal.P;
import org.apache.tinkerpop.gremlin.process.traversal.SackFunctions;
import org.apache.tinkerpop.gremlin.process.traversal.Translator;
import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
import org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.VerificationException;
import org.apache.tinkerpop.gremlin.process.traversal.util.ConnectiveP;
import org.apache.tinkerpop.gremlin.process.traversal.util.EmptyTraversal;
import org.apache.tinkerpop.gremlin.process.traversal.util.OrP;
import org.apache.tinkerpop.gremlin.process.traversal.util.TranslatorHelper;
import org.apache.tinkerpop.gremlin.structure.Element;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.apache.tinkerpop.gremlin.structure.util.StringFactory;
import org.apache.tinkerpop.gremlin.util.function.Lambda;
import java.util.ArrayList;
import java.util.List;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public final class GroovyTranslator implements Translator<String> {
private final String alias;
private GroovyTranslator(final String alias) {
this.alias = alias;
}
public static final GroovyTranslator of(final String alias) {
return new GroovyTranslator(alias);
}
@Override
public String translate(final ByteCode byteCode) {
final StringBuilder traversalScript = new StringBuilder(this.alias);
for (final ByteCode.Instruction instruction : byteCode.getStepInstructions()) {
final String methodName = instruction.getOperator();
final Object[] arguments = instruction.getArguments();
final List<Object> objects = TranslatorHelper.flattenArguments(arguments);
if (objects.isEmpty())
traversalScript.append(".").append(methodName).append("()");
else {
traversalScript.append(".");
String temp = methodName + "(";
for (final Object object : objects) {
temp = temp + convertToString(object) + ",";
}
traversalScript.append(temp.substring(0, temp.length() - 1) + ")");
}
}
final String script = traversalScript.toString();
if (script.contains("$"))
throw new VerificationException("Lambdas are currently not supported: " + script, EmptyTraversal.instance());
return script;
}
@Override
public String getSourceLanguage() {
return "gremlin-java";
}
@Override
public String getTargetLanguage() {
return "gremlin-groovy";
}
@Override
public String toString() {
return StringFactory.translatorString(this);
}
@Override
public String getAlias() {
return this.alias;
}
///////
private static String convertToString(final Object object) {
if (object instanceof String)
return "\"" + object + "\"";
else if (object instanceof List) {
final List<String> list = new ArrayList<>(((List) object).size());
for (final Object item : (List) object) {
list.add(convertToString(item));
}
return list.toString();
} else if (object instanceof Long)
return object + "L";
else if (object instanceof Double)
return object + "d";
else if (object instanceof Float)
return object + "f";
else if (object instanceof Integer)
return "(int) " + object;
else if (object instanceof Class)
return ((Class) object).getCanonicalName();
else if (object instanceof P)
return convertPToString((P) object, new StringBuilder()).toString();
else if (object instanceof SackFunctions.Barrier)
return "SackFunctions.Barrier." + object.toString();
else if (object instanceof VertexProperty.Cardinality)
return "VertexProperty.Cardinality." + object.toString();
else if (object instanceof Enum)
return ((Enum) object).getDeclaringClass().getSimpleName() + "." + object.toString();
else if (object instanceof Element)
return convertToString(((Element) object).id()); // hack
else if (object instanceof Computer) { // TODO: blow out
return "";
} else if (object instanceof Lambda) {
final String lambdaString = ((Lambda) object).getLambdaScript();
return lambdaString.startsWith("{") ? lambdaString : "{" + lambdaString + "}";
} else if (object instanceof Traversal)
return new GroovyTranslator("__").translate(((Traversal.Admin) object).getByteCode()).toString(); // TODO: make a static GroovyTranslator(__) object
else
return null == object ? "null" : object.toString();
}
private static StringBuilder convertPToString(final P p, final StringBuilder current) {
if (p instanceof ConnectiveP) {
final List<P<?>> list = ((ConnectiveP) p).getPredicates();
for (int i = 0; i < list.size(); i++) {
convertPToString(list.get(i), current);
if (i < list.size() - 1)
current.append(p instanceof OrP ? ".or(" : ".and(");
}
current.append(")");
} else
current.append("P.").append(p.getBiPredicate().toString()).append("(").append(convertToString(p.getValue())).append(")");
return current;
}
}