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1   package org.apache.jcs.auxiliary.disk.jdbc.mysql.util;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.Calendar;
23  import java.util.Date;
24  import java.util.StringTokenizer;
25  
26  /***
27   * Parses the very simple schedule format.
28   * <p>
29   * @author Aaron Smuts
30   */
31  public class ScheduleParser
32  {
33      /***
34       * For each date time that is separated by a comma in the
35       * OptimizationSchedule, create a date and add it to an array of dates.
36       * <p>
37       * @param schedule
38       * @return Date[]
39       * @throws ScheduleFormatException
40       */
41      public static Date[] createDatesForSchedule( String schedule )
42          throws ScheduleFormatException
43      {
44          if ( schedule == null )
45          {
46              throw new ScheduleFormatException( "Cannot create schedules for a null String." );
47          }
48  
49          StringTokenizer toker = new StringTokenizer( schedule, "," );
50          Date[] dates = new Date[toker.countTokens()];
51          int cnt = 0;
52          while ( toker.hasMoreTokens() )
53          {
54              String time = toker.nextToken();
55              dates[cnt] = getDateForSchedule( time );
56              cnt++;
57          }
58          return dates;
59      }
60  
61      /***
62       * For a single string it creates a date that is the next time this hh:mm:ss
63       * combo will be seen.
64       * <p>
65       * @param startTime
66       * @return
67       * @throws ScheduleFormatException
68       */
69      public static Date getDateForSchedule( String startTime )
70          throws ScheduleFormatException
71      {
72          if ( startTime == null )
73          {
74              throw new ScheduleFormatException( "Cannot create date for a null String." );
75          }
76  
77          int firstColon = startTime.indexOf( ":" );
78          int lastColon = startTime.lastIndexOf( ":" );
79          int len = startTime.length();
80          if ( firstColon == -1 || lastColon == -1 || firstColon == lastColon || lastColon == len )
81          {
82              String message = "StartTime [" + startTime + "] is deformed.  Unable to schedule optimizaiton.";
83              throw new ScheduleFormatException( message );
84          }
85  
86          Calendar cal = Calendar.getInstance();
87          try
88          {
89              int hour = Integer.parseInt( startTime.substring( 0, firstColon ) );
90              cal.set( Calendar.HOUR_OF_DAY, hour );
91              int minute = Integer.parseInt( startTime.substring( firstColon + 1, lastColon ) );
92              cal.set( Calendar.MINUTE, minute );
93              int second = Integer.parseInt( startTime.substring( lastColon + 1, len ) );
94              cal.set( Calendar.SECOND, second );
95          }
96          catch ( NumberFormatException e )
97          {
98              String message = "Problem parsing start time [" + startTime + "].  It should be in HH:MM:SS format.";
99              throw new ScheduleFormatException( message );
100         }
101 
102         // if the date is less than now, add a day.
103         Date now = new Date();
104         if ( cal.getTime().before( now ) )
105         {
106             cal.add( Calendar.DAY_OF_MONTH, 1 );
107         }
108 
109         return cal.getTime();
110     }
111 }