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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.spark.graphx;
Represents a subset of the fields of an [[EdgeTriplet]] or [[EdgeContext]]. This allows the system to populate only those fields for efficiency.
public class TripletFields implements Serializable {

  
Indicates whether the source vertex attribute is included.
  public final boolean useSrc;

  
Indicates whether the destination vertex attribute is included.
  public final boolean useDst;

  
Indicates whether the edge attribute is included.
  public final boolean useEdge;

  
Constructs a default TripletFields in which all fields are included.
  public TripletFields() {
    this(truetruetrue);
  }
  public TripletFields(boolean useSrcboolean useDstboolean useEdge) {
    this. = useSrc;
    this. = useDst;
    this. = useEdge;
  }

  
None of the triplet fields are exposed.
  public static final TripletFields None = new TripletFields(falsefalsefalse);

  
Expose only the edge field and not the source or destination field.
  public static final TripletFields EdgeOnly = new TripletFields(falsefalsetrue);

  
Expose the source and edge fields but not the destination field. (Same as Src)
  public static final TripletFields Src = new TripletFields(truefalsetrue);

  
Expose the destination and edge fields but not the source field. (Same as Dst)
  public static final TripletFields Dst = new TripletFields(falsetruetrue);

  
Expose all the fields (source, edge, and destination).
  public static final TripletFields All = new TripletFields(truetruetrue);
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