package org.apache.archiva.policies;
   
   /*
    * 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 org.apache.archiva.common.utils.VersionUtil;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.Calendar;
  import java.util.List;
  import java.util.Properties;
  
  /**
   * AbstractUpdatePolicy
   *
   *
   */
  public abstract class AbstractUpdatePolicy
      implements PreDownloadPolicy
  {
      private Logger log = LoggerFactory.getLogger( AbstractUpdatePolicy.class );
  
      /**
       * The ALWAYS policy setting means that the artifact is always uipdated from the remote repo.
       */
      public static final String ALWAYS = "always";
  
      /**
       * The NEVER policy setting means that the artifact is never updated from the remote repo.
       */
      public static final String NEVER = "never";
  
      /**
       * <p>
       * The DAILY policy means that the artifact retrieval occurs only if one of
       * the following conditions are met...
       * </p>
       * <ul>
       * <li>The local artifact is not present.</li>
       * <li>The local artifact has a last modified timestamp older than (now - 1 day).</li>
       * </ul>
       */
      public static final String DAILY = "daily";
  
      /**
       * <p>
       * The HOURLY policy means that the artifact retrieval occurs only if one of
       * the following conditions are met...
       * </p>
       * <ul>
       * <li>The local artifact is not present.</li>
       * <li>The local artifact has a last modified timestamp older than (now - 1 hour).</li>
       * </ul>
       */
      public static final String HOURLY = "hourly";
  
      /**
       * The ONCE policy means that the artifact retrieval occurs only if the
       * local artifact is not present.  This means that the retreival can only
       * occur once.
       */
      public static final String ONCE = "once";
  
      private List<String> options = new ArrayList<>( 5 );
  
      public AbstractUpdatePolicy()
      {
          options.add( ALWAYS );
          options.add( HOURLY );
          options.add( DAILY );
          options.add( ONCE );
          options.add( NEVER );
      }
  
      protected abstract boolean isSnapshotPolicy();
  
      protected abstract String getUpdateMode();
  
      @Override
     public List<String> getOptions()
     {
         return options;
     }
 
     @Override
     public void applyPolicy( String policySetting, Properties request, File localFile )
         throws PolicyViolationException, PolicyConfigurationException
     {
         if ( !StringUtils.equals( request.getProperty( "filetype" ), "artifact" ) )
         {
             // Only process artifact file types.
             return;
         }
 
         String version = request.getProperty( "version", "" );
         boolean isSnapshotVersion = false;
 
         if ( StringUtils.isNotBlank( version ) )
         {
             isSnapshotVersion = VersionUtil.isSnapshot( version );
         }
 
         if ( !options.contains( policySetting ) )
         {
             // Not a valid code. 
             throw new PolicyConfigurationException(
                 "Unknown " + getUpdateMode() + " policy setting [" + policySetting + "], valid settings are ["
                     + StringUtils.join( options.iterator(), "," ) + "]" );
         }
 
         if ( ALWAYS.equals( policySetting ) )
         {
             // Skip means ok to update.
             log.debug( "OK to update, {} policy set to ALWAYS.", getUpdateMode() );
             return;
         }
 
         // Test for mismatches.
         if ( !isSnapshotVersion && isSnapshotPolicy() )
         {
             log.debug( "OK to update, snapshot policy does not apply for non-snapshot versions." );
             return;
         }
 
         if ( isSnapshotVersion && !isSnapshotPolicy() )
         {
             log.debug( "OK to update, release policy does not apply for snapshot versions." );
             return;
         }
 
         if ( NEVER.equals( policySetting ) )
         {
             // Reject means no.
             throw new PolicyViolationException( "NO to update, " + getUpdateMode() + " policy set to NEVER." );
         }
 
         if ( !localFile.exists() )
         {
             // No file means it's ok.
             log.debug( "OK to update {}, local file does not exist.", getUpdateMode() );
             return;
         }
 
         if ( ONCE.equals( policySetting ) )
         {
             // File exists, but policy is once.
             throw new PolicyViolationException(
                 "NO to update " + getUpdateMode() + ", policy is ONCE, and local file exist." );
         }
 
         if ( DAILY.equals( policySetting ) )
         {
             Calendar cal = Calendar.getInstance();
             cal.add( Calendar.DAY_OF_MONTH, -1 );
             Calendar fileCal = Calendar.getInstance();
             fileCal.setTimeInMillis( localFile.lastModified() );
 
             if ( cal.after( fileCal ) )
             {
                 // Its ok.
                 return;
             }
             else
             {
                 throw new PolicyViolationException( "NO to update " + getUpdateMode()
                                                         + ", policy is DAILY, local file exist, and has been updated within the last day." );
             }
         }
 
         if ( HOURLY.equals( policySetting ) )
         {
             Calendar cal = Calendar.getInstance();
             cal.add( Calendar.HOUR, -1 );
             Calendar fileCal = Calendar.getInstance();
             fileCal.setTimeInMillis( localFile.lastModified() );
 
             if ( cal.after( fileCal ) )
             {
                 // Its ok.
                 return;
             }
             else
             {
                 throw new PolicyViolationException( "NO to update " + getUpdateMode()
                                                         + ", policy is HOURLY, local file exist, and has been updated within the last hour." );
             }
         }
 
         throw new PolicyConfigurationException(
             "Unable to process " + getUpdateMode() + " policy of [" + policySetting + "], please file a bug report." );
     }
 }