/**
    * Copyright 2010-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.util.wait;
  
  import static org.kuali.common.util.base.Precondition.checkMin;
  
  public final class WaitResult {
  
  	private final long start;
  	private final long stop;
  	private final long elapsed;
  
  	public static WaitResult create(long start, long stop) {
  		return builder(start, stop).build();
  	}
  
  	public static Builder builder(long start, long stop) {
  		return new Builder(start, stop);
  	}
  
  	public static class Builder {
  
  		private final long start;
  		private final long stop;
  		private final long elapsed;
  
  		public Builder(long start, long stop) {
  			this.start = start;
  			this.stop = stop;
  			this.elapsed = stop - start;
  		}
  
  		public WaitResult build() {
  			WaitResult instance = new WaitResult(this);
  			validate(instance);
  			return instance;
  		}
  
  		private static void validate(WaitResult instance) {
  			checkMin(instance.start, 0, "start");
  			checkMin(instance.stop, instance.start, "stop");
  			checkMin(instance.elapsed, 0, "elapsed");
  		}
  
  	}
  
  	private WaitResult(Builder builder) {
  		this.start = builder.start;
  		this.stop = builder.stop;
  		this.elapsed = builder.elapsed;
  	}
  
  	public long getStart() {
  		return start;
  	}
  
  	public long getElapsed() {
  		return elapsed;
  	}
  
  	public long getStop() {
  		return stop;
  	}
  
  }