content: /**
   * 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.bigtop.datagenerators.samplers.samplers;
  
  public class SequenceSampler implements Sampler<Integer>
  {
  	Integer start;
  	Integer end;
  	Integer step;
  	Integer next;
  
  	public SequenceSampler()
  	{
  		start = 0;
  		end = null;
  		step = 1;
  		next = start;
  	}
  
  	public SequenceSampler(Integer start)
  	{
  		this.start = start;
  		end = null;
  		step = 1;
  		next = start;
  	}
  
  	public SequenceSampler(Integer start, Integer end)
  	{
  		this.start = start;
  		this.end = end;
  		step = 1;
  		next = start;
  	}
  
  	public SequenceSampler(Integer start, Integer end, Integer step)
  	{
  		this.start = start;
  		this.end = end;
  		this.step = step;
  		next = start;
  	}
  
  	public Integer sample() throws Exception
  	{
  		if(end == null || next < end)
  		{
  			Integer current = next;
  			next = current + step;
  			return current;
  		}
  
  		throw new Exception("All values have been sampled");
  	}
  
  
  }
  