spark TripletFields 源码
spark TripletFields 代码
文件路径：/graphx/src/main/java/org/apache/spark/graphx/TripletFields.java
/*
* 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;
import java.io.Serializable;
/**
* 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(true, true, true);
}
public TripletFields(boolean useSrc, boolean useDst, boolean useEdge) {
this.useSrc = useSrc;
this.useDst = useDst;
this.useEdge = useEdge;
}
/**
* None of the triplet fields are exposed.
*/
public static final TripletFields None = new TripletFields(false, false, false);
/**
* Expose only the edge field and not the source or destination field.
*/
public static final TripletFields EdgeOnly = new TripletFields(false, false, true);
/**
* Expose the source and edge fields but not the destination field. (Same as Src)
*/
public static final TripletFields Src = new TripletFields(true, false, true);
/**
* Expose the destination and edge fields but not the source field. (Same as Dst)
*/
public static final TripletFields Dst = new TripletFields(false, true, true);
/**
* Expose all the fields (source, edge, and destination).
*/
public static final TripletFields All = new TripletFields(true, true, true);
}
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