/*
 * 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.giraph.block_app.library.pagerank;

import org.apache.giraph.conf.GiraphConfigurationSettable;
import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
import org.apache.giraph.factories.VertexValueFactory;
import org.apache.hadoop.io.DoubleWritable;

/**
 * Factory to create initial PageRank value
 */
public class PageRankVertexValueFactory
    implements VertexValueFactory<DoubleWritable>, GiraphConfigurationSettable {
  /** Cached initial value. */
  private double initialValue;

  @Override
  public void setConf(ImmutableClassesGiraphConfiguration configuration) {
    initialValue = PageRankSettings.getInitialValue(configuration);
  }

  @Override
  public DoubleWritable newInstance() {
    return new DoubleWritable(initialValue);
  }
}
