// Copyright 2017 JanusGraph Authors
//
// 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.
package org.janusgraph.graphdb.query.condition;
import com.google.common.base.Preconditions;
import org.janusgraph.core.JanusGraphEdge;
import org.janusgraph.core.JanusGraphRelation;
import org.janusgraph.core.JanusGraphVertex;
import org.apache.tinkerpop.gremlin.structure.Direction;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class IncidenceDirectionCondition<E extends JanusGraphRelation> extends Literal<E> {
private final Direction direction;
private final JanusGraphVertex otherVertex;
public IncidenceDirectionCondition(Direction direction, JanusGraphVertex otherVertex) {
Preconditions.checkNotNull(direction);
Preconditions.checkNotNull(otherVertex);
this.direction = direction;
this.otherVertex = otherVertex;
}
@Override
public boolean evaluate(E relation) {
return relation.isEdge() && ((JanusGraphEdge) relation).vertex(direction).equals(otherVertex);
}
@Override
public int hashCode() {
return new HashCodeBuilder().append(getType()).append(direction).append(otherVertex).toHashCode();
}
@Override
public boolean equals(Object other) {
if (this == other)
return true;
if (other==null || !getClass().isInstance(other))
return false;
IncidenceDirectionCondition oth = (IncidenceDirectionCondition)other;
return direction==oth.direction && otherVertex.equals(oth.otherVertex);
}
@Override
public String toString() {
return "incidence["+ direction + "-" + otherVertex + "]";
}
}