package org.apache.maven.plugin.version;

 /*

  * 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.

  */

 import java.util.Calendar;

 import java.util.Date;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.regex.Matcher;

 import java.util.regex.Pattern;

 public final class IntervalUtils

 {

     private static final String PERIOD_PART_PATTERN = "[0-9]+[WwDdHhMm]?";

     private static final Map PART_TYPE_CONTRIBUTIONS;

     static

     {

         Map contributions = new HashMap();

         contributions.put( "w", new Long( 7 * 24 * 60 * 60 * 1000 ) );

         contributions.put( "d", new Long( 24 * 60 * 60 * 1000 ) );

         contributions.put( "h", new Long( 60 * 60 * 1000 ) );

         contributions.put( "m", new Long( 60 * 1000 ) );

         PART_TYPE_CONTRIBUTIONS = contributions;

     }

     private IntervalUtils()

     {

         // don't allow construction

     }

     public static boolean isExpired( String intervalSpec, Date lastChecked )

     {

         if( "never".equalsIgnoreCase( intervalSpec ) )

         {

             return false;

         }

         else if( "always".equalsIgnoreCase( intervalSpec ) )

         {

             return true;

         }

         else if( intervalSpec != null && intervalSpec.toLowerCase().startsWith("interval:") && intervalSpec.length() > "interval:".length())

         {

             String intervalPart = intervalSpec.substring( "interval:".length() );

             // subtract the specified period from now() and see if it's still after the lastChecked date.

             long period = IntervalUtils.parseInterval(intervalPart);

             Calendar cal = Calendar.getInstance();

             cal.setTimeInMillis( System.currentTimeMillis() - period );

             Date test = cal.getTime();

             return lastChecked == null || test.after( lastChecked );

         }

         else

         {

             throw new IllegalArgumentException( "Invalid interval specification: \'" + intervalSpec + "\'" );

         }

     }

     public static long parseInterval( String interval )

     {

         Matcher partMatcher = Pattern.compile(PERIOD_PART_PATTERN).matcher(interval);

         long period = 0;

         while( partMatcher.find() )

         {

             String part = partMatcher.group();

             period += getPartPeriod( part );

         }

         return period;

     }

     private static long getPartPeriod( String part )

     {

         char type = part.charAt( part.length() - 1 );

         String coefficientPart;

         if( Character.isLetter(type))

         {

             coefficientPart = part.substring( 0, part.length() - 1);

         }

         else

         {

             // if the interval doesn't specify a resolution, assume minutes.

             coefficientPart = part;

             type = 'm';

         }

         int coefficient = Integer.parseInt( coefficientPart );

         Long period = (Long) PART_TYPE_CONTRIBUTIONS.get( "" + Character.toLowerCase( type ) );

         long result = 0;

         if( period != null )

         {

             result = coefficient * period.longValue();

         }

         return result;

     }

 }