| /* |
| * 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.language.grammar; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.structure.util.CloseableIterator; |
| |
| /** |
| * Traversal terminal method visitor |
| */ |
| public class TraversalTerminalMethodVisitor extends DefaultGremlinBaseVisitor<Object> { |
| |
| protected final Traversal<?,?> traversal; |
| |
| public TraversalTerminalMethodVisitor(final Traversal<?,?> traversal) { |
| this.traversal = traversal; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod(final GremlinParser.TraversalTerminalMethodContext ctx) { |
| return visitChildren(ctx); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method explain step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_explain(final GremlinParser.TraversalTerminalMethod_explainContext ctx) { |
| return traversal.explain(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method has next step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_hasNext(final GremlinParser.TraversalTerminalMethod_hasNextContext ctx) { |
| try { |
| return traversal.hasNext(); |
| } finally { |
| CloseableIterator.closeIterator(traversal); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method iterate step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_iterate(final GremlinParser.TraversalTerminalMethod_iterateContext ctx) { |
| return traversal.iterate(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method try next step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_tryNext(final GremlinParser.TraversalTerminalMethod_tryNextContext ctx) { |
| try { |
| return traversal.tryNext(); |
| } finally { |
| CloseableIterator.closeIterator(traversal); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method next step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_next(final GremlinParser.TraversalTerminalMethod_nextContext ctx) { |
| try { |
| if (ctx.getChildCount() == 3) { |
| return traversal.next(); |
| } else { |
| // the 3rd child is integer value |
| final int childIndexOfParamaterAmount = 2; |
| return traversal.next(Integer.decode(ctx.getChild(childIndexOfParamaterAmount).getText())); |
| } |
| } finally { |
| CloseableIterator.closeIterator(traversal); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method to list step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_toList(final GremlinParser.TraversalTerminalMethod_toListContext ctx) { |
| return traversal.toList(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method to set step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_toSet(final GremlinParser.TraversalTerminalMethod_toSetContext ctx) { |
| return traversal.toSet(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Traversal terminal method to bulk set step |
| */ |
| @Override |
| public Object visitTraversalTerminalMethod_toBulkSet(final GremlinParser.TraversalTerminalMethod_toBulkSetContext ctx) { |
| return traversal.toBulkSet(); |
| } |
| } |