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VertexInputFilter xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.giraph.io.filters;
19  
20  import org.apache.giraph.graph.Vertex;
21  import org.apache.hadoop.io.Writable;
22  import org.apache.hadoop.io.WritableComparable;
23  
24  /**
25   * Filters vertices on input.
26   *
27   * @param <I> Vertex ID
28   * @param <V> Vertex Value
29   * @param <E> Edge Value
30   */
31  public interface VertexInputFilter<I extends WritableComparable,
32      V extends Writable, E extends Writable> {
33    /**
34     * Whether to drop a vertex on input.
35     *
36     * @param vertex to check
37     * @return true if we should drop vertex
38     */
39    boolean dropVertex(Vertex<I, V, E> vertex);
40  }
41