| /** |
| * 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.atlas.gremlin.optimizer; |
| |
| import com.google.common.base.Function; |
| |
| import org.apache.atlas.groovy.AbstractFunctionExpression; |
| import org.apache.atlas.groovy.FunctionCallExpression; |
| import org.apache.atlas.groovy.GroovyExpression; |
| import org.apache.atlas.groovy.TraversalStepType; |
| |
| /** |
| * Matches an expression that gets called after calling or(). For example, |
| * in g.V().or(x,y).toList(), "toList()" is the "or parent", so calling |
| * "apply()" on this expression would return true and calling it on all |
| * the other ones would return false. |
| */ |
| public final class IsOrParent implements Function<GroovyExpression, Boolean> { |
| |
| public static final IsOrParent INSTANCE = new IsOrParent(); |
| |
| private IsOrParent() { |
| |
| } |
| |
| @Override |
| public Boolean apply(GroovyExpression expr) { |
| if (!(expr instanceof AbstractFunctionExpression)) { |
| return false; |
| } |
| AbstractFunctionExpression functionCall = (AbstractFunctionExpression)expr; |
| GroovyExpression target = functionCall.getCaller(); |
| |
| if (!(target instanceof FunctionCallExpression)) { |
| return false; |
| } |
| |
| if (target.getType() != TraversalStepType.FILTER) { |
| return false; |
| } |
| |
| FunctionCallExpression targetFunction = (FunctionCallExpression)target; |
| return targetFunction.getFunctionName().equals("or"); |
| } |
| } |