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Related discussion where the conclusion was made to relax individual steps based on necessity: https://lists.apache.org/thread/vjbjh29kwjhd5lcmkqqqqrhw7rw2ynh9 Signed-off-by: Oleksandr Porunov <alexandr.porunov@gmail.com>
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...java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/RemovedEventUtil.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.process.traversal.step.util.event; | ||
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| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; | ||
| import org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration.EventStrategy; | ||
| import org.apache.tinkerpop.gremlin.structure.*; | ||
|
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| public class RemovedEventUtil { | ||
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| public static void registerElementRemoval(CallbackRegistry<Event> callbackRegistry, | ||
| Traversal.Admin<Object, Object> traversal, | ||
| Element elementForRemoval){ | ||
| final EventStrategy eventStrategy = traversal.getStrategies().getStrategy(EventStrategy.class).get(); | ||
| final Event removeEvent; | ||
| if (elementForRemoval instanceof Vertex) | ||
| removeEvent = new Event.VertexRemovedEvent(eventStrategy.detach((Vertex) elementForRemoval)); | ||
| else if (elementForRemoval instanceof Edge) | ||
| removeEvent = new Event.EdgeRemovedEvent(eventStrategy.detach((Edge) elementForRemoval)); | ||
| else if (elementForRemoval instanceof VertexProperty) | ||
| removeEvent = new Event.VertexPropertyRemovedEvent(eventStrategy.detach((VertexProperty) elementForRemoval)); | ||
| else | ||
| throw new IllegalStateException("The incoming object is not removable: " + elementForRemoval); | ||
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| callbackRegistry.getCallbacks().forEach(c -> c.accept(removeEvent)); | ||
| } | ||
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| public static void registerPropertyRemoval(CallbackRegistry<Event> callbackRegistry, | ||
| Traversal.Admin<Object, Object> traversal, | ||
| Property elementForRemoval){ | ||
| final EventStrategy eventStrategy = traversal.getStrategies().getStrategy(EventStrategy.class).get(); | ||
| final Event.ElementPropertyEvent removeEvent; | ||
| if (elementForRemoval.element() instanceof Edge) | ||
| removeEvent = new Event.EdgePropertyRemovedEvent(eventStrategy.detach((Edge) elementForRemoval.element()), eventStrategy.detach(elementForRemoval)); | ||
| else if (elementForRemoval.element() instanceof VertexProperty) | ||
| removeEvent = new Event.VertexPropertyPropertyRemovedEvent(eventStrategy.detach((VertexProperty) elementForRemoval.element()), eventStrategy.detach(elementForRemoval)); | ||
| else | ||
| throw new IllegalStateException("The incoming object is not removable: " + elementForRemoval); | ||
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| callbackRegistry.getCallbacks().forEach(c -> c.accept(removeEvent)); | ||
| } | ||
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| public static boolean hasAnyCallbacks(CallbackRegistry<Event> callbackRegistry){ | ||
| return callbackRegistry != null && !callbackRegistry.getCallbacks().isEmpty(); | ||
| } | ||
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| } |