/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed 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.
 * ============LICENSE_END=========================================================
 *
 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 */
package org.onap.aai.serialization.engines.query;/*-
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed 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.
 * ============LICENSE_END=========================================================
 */

/*
package org.onap.aai.serialization.engines.query;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.onap.aai.db.AAIProperties;
import org.onap.aai.query.builder.QueryBuilder;
import org.onap.aai.serialization.engines.TransactionalGraphEngine;
import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.TransactionalGraph;
import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.gremlin.java.GremlinPipeline;
import com.tinkerpop.pipes.IdentityPipe;
import com.tinkerpop.pipes.PipeFunction;
import com.tinkerpop.pipes.branch.LoopPipe;

public class GremlinPipelineQueryEngine extends QueryEngine {

	public GremlinPipelineQueryEngine(TransactionalGraphEngine graphEngine) {
		super(graphEngine);
	}

	@Override
	public List<Vertex> executeQuery(TransactionalGraph g, QueryBuilder query) {
		List<Vertex> results = null;
		Vertex start = query.getStart();
		if (start != null) {
			results = ((GremlinPipeline)query.getQuery()).cast(Vertex.class).toList();
		} else {
			GremlinPipeline pipe = new GremlinPipeline(g);
			results = process(pipe, (GremlinPipeline)query.getQuery());

		}
		return results;
	}
	
	@Override
	public List<Vertex> executeParentQuery(TransactionalGraph g, QueryBuilder query) {
		List<Vertex> results = null;
		Vertex start = query.getStart();
		if (start != null) {
			results = ((GremlinPipeline)query.getParentQuery()).cast(Vertex.class).toList();
		} else {
			GremlinPipeline pipe = new GremlinPipeline(g);
			results = process(pipe, (GremlinPipeline)query.getParentQuery());

		}
		return results;
	}

	@Override
	public List<Vertex> findParents(Vertex start) {
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline(start).as("x").inE()
				.has("isParent", true).outV().loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.inE().has("isParent", true).count() == 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		return results;
	}

	@Override
	public List<Vertex> findChildren(Vertex start) {
		Set<Vertex> seen = new HashSet<>();
		seen.add(start);
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline(start).as("x").outE().has("isParent", true).inV()
				.except(seen).store(seen).loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.outE().has("isParent", true).count() >= 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		return results;
	}

	@Override
	public List<Vertex> findDeletable(Vertex start) {
		Set<Vertex> seen = new HashSet<>();
		seen.add(start);
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>(start).as("x").outE().or(
				new GremlinPipeline(new IdentityPipe()).has("isParent", true),
				new GremlinPipeline(new IdentityPipe()).has("hasDelTarget", true)).inV()
				.except(seen).store(seen).loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.outE().or(
								new GremlinPipeline(new IdentityPipe()).has("isParent", true),
								new GremlinPipeline(new IdentityPipe()).has("hasDelTarget", true)).count() >= 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		
		return results;
	}
	
	private List<Vertex> process(GremlinPipeline start, GremlinPipeline pipe) {
		
		
		return start.add(pipe).cast(Vertex.class).toList();
	}

	@Override
	public List<Vertex> findRelatedVertices(Vertex start, Direction direction, String label, String nodeType) {
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>(start);
		switch (direction) {
			case OUT:
				pipe.out(label);
				break;
			case IN:
				pipe.in(label);
				break;
			case BOTH:
				pipe.both(label);
				break;
			 default:
				break;
		}
		
		pipe.has(AAIProperties.NODE_TYPE, nodeType).dedup();
		List<Vertex> result = pipe.toList();
		return result;
	}

}
*/