| /* |
| * 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.util; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Bytecode; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalSource; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| |
| import java.util.Iterator; |
| |
| /** |
| * Utility class for parsing {@link Bytecode}. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public final class BytecodeUtil { |
| |
| private BytecodeUtil() {} |
| |
| /** |
| * Parses {@link Bytecode} to find {@link TraversalStrategy} objects in the source instructions. |
| */ |
| public static <A extends TraversalStrategy> Iterator<A> findStrategies(final Bytecode bytecode, final Class<A> clazz) { |
| return IteratorUtils.map( |
| IteratorUtils.filter(bytecode.getSourceInstructions().iterator(), |
| s -> s.getOperator().equals(TraversalSource.Symbols.withStrategies) && clazz.isAssignableFrom(s.getArguments()[0].getClass())), |
| os -> (A) os.getArguments()[0]); |
| } |
| } |