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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 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.tinkerpop;
import org.apache.tinkerpop.gremlin.structure.Direction;
import org.apache.tinkerpop.gremlin.structure.Edge;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.util.detached.DetachedEdge;
import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils;
import java.util.Iterator;
/**
* Represents a {@link Edge} that is disconnected from a {@link Graph} however,
* traversals are supported as they are backed by a Tree with saturated {@link Vertex} and {@link Edge} objects.
* These objects are not mutable and can only be used to read information out.
*
*/
public class TreeBackedEdge extends DetachedEdge implements Edge {
private static final long serialVersionUID = 5419650145562077538L;
private TreeBackedVertex inVertex;
private TreeBackedVertex outVertex;
public TreeBackedEdge(Edge edge, TreeBackedVertex inVertex, TreeBackedVertex outVertex) {
super(edge, true);
this.inVertex = inVertex;
this.outVertex = outVertex;
}
@Override
public Vertex inVertex() {
return this.inVertex;
}
@Override
public Vertex outVertex() {
return this.outVertex;
}
@Override
public Iterator<Vertex> bothVertices() {
return this.vertices(Direction.BOTH);
}
@Override
public Iterator<Vertex> vertices(Direction direction) {
switch (direction) {
case OUT:
return IteratorUtils.of(this.outVertex);
case IN:
return IteratorUtils.of(this.inVertex);
default:
return IteratorUtils.of(this.outVertex, this.inVertex);
}
}
}
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