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/**
 * 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.hive.hplsql;

public class Timer {
  long start = 0;
  long stop = 0;
  long elapsed = 0;
  
  /**
   * Start the timer
   */
  public long start() {
    start = System.currentTimeMillis();
    return start;
  }
  
  /**
   * Get intermediate timer value
   */
  public long current() {
    return System.currentTimeMillis();
  }
  
  /**
   * Stop the timer and return elapsed time
   */
  public long stop() {
    stop = System.currentTimeMillis();
    elapsed = stop - start;
    return elapsed;
  }
  
  /**
   * Format the elapsed time
   */
  public String format() {
    if (elapsed < 1000) {
      return String.valueOf(elapsed) + " ms";
    }
    return String.format("%.2f", ((float)elapsed)/1000) + " sec";
  }
}