// 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.log;
import com.carrotsearch.hppc.cursors.LongObjectCursor;
import org.janusgraph.core.EdgeLabel;
import org.janusgraph.core.PropertyKey;
import org.janusgraph.core.log.Change;
import org.janusgraph.diskstorage.Entry;
import org.janusgraph.graphdb.database.log.TransactionLogHeader;
import org.janusgraph.graphdb.internal.ElementLifeCycle;
import org.janusgraph.graphdb.internal.InternalRelation;
import org.janusgraph.graphdb.internal.InternalRelationType;
import org.janusgraph.graphdb.internal.InternalVertex;
import org.janusgraph.graphdb.relations.*;
import org.janusgraph.graphdb.transaction.StandardJanusGraphTx;
import org.apache.tinkerpop.gremlin.structure.Direction;
/**
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class ModificationDeserializer {
public static InternalRelation parseRelation(TransactionLogHeader.Modification modification, StandardJanusGraphTx tx) {
Change state = modification.state;
assert state.isProper();
long outVertexId = modification.outVertexId;
Entry relEntry = modification.relationEntry;
InternalVertex outVertex = tx.getInternalVertex(outVertexId);
//Special relation parsing, compare to {@link RelationConstructor}
RelationCache relCache = tx.getEdgeSerializer().readRelation(relEntry, false, tx);
assert relCache.direction == Direction.OUT;
InternalRelationType type = (InternalRelationType)tx.getExistingRelationType(relCache.typeId);
assert type.getBaseType()==null;
InternalRelation rel;
if (type.isPropertyKey()) {
if (state==Change.REMOVED) {
rel = new StandardVertexProperty(relCache.relationId,(PropertyKey)type,outVertex,relCache.getValue(), ElementLifeCycle.Removed);
} else {
rel = new CacheVertexProperty(relCache.relationId,(PropertyKey)type,outVertex,relCache.getValue(),relEntry);
}
} else {
assert type.isEdgeLabel();
InternalVertex otherVertex = tx.getInternalVertex(relCache.getOtherVertexId());
if (state==Change.REMOVED) {
rel = new StandardEdge(relCache.relationId, (EdgeLabel) type, outVertex, otherVertex,ElementLifeCycle.Removed);
} else {
rel = new CacheEdge(relCache.relationId, (EdgeLabel) type, outVertex, otherVertex,relEntry);
}
}
if (state==Change.REMOVED && relCache.hasProperties()) { //copy over properties
for (LongObjectCursor<Object> entry : relCache) {
rel.setPropertyDirect(tx.getExistingPropertyKey(entry.key),entry.value);
}
}
return rel;
}
}