1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   *  contributor license agreements.  The ASF licenses this file to You
     4   * under the Apache License, Version 2.0 (the "License"); you may not
     5   * use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.  For additional information regarding
    15   * copyright in this work, please see the NOTICE file in the top level
    16   * directory of this distribution.
    17   */
    18  /* Created on Jul 16, 2003 */
    19  package org.apache.roller.weblogger.business.search.operations;
    20  
    21  import java.io.IOException;
    22  
    23  import org.apache.commons.logging.Log;
    24  import org.apache.commons.logging.LogFactory;
    25  import org.apache.lucene.index.IndexReader;
    26  import org.apache.lucene.index.Term;
    27  import org.apache.roller.weblogger.WebloggerException;
    28  import org.apache.roller.weblogger.business.Weblogger;
    29  import org.apache.roller.weblogger.business.WeblogManager;
    30  import org.apache.roller.weblogger.business.search.IndexManagerImpl;
    31  import org.apache.roller.weblogger.business.search.FieldConstants;
    32  import org.apache.roller.weblogger.pojos.WeblogEntry;
    33  
    34  
    35  /**
    36   * An operation that removes the weblog from the index.
    37   * @author Mindaugas Idzelis (min@idzelis.com)
    38   */
    39  public class RemoveEntryOperation extends WriteToIndexOperation {
    40      
    41      //~ Static fields/initializers =============================================
    42      
             /* 
    P/P       *  Method: org.apache.roller.weblogger.business.search.operations.RemoveEntryOperation__static_init
              * 
              *  Presumptions:
              *    org.apache.commons.logging.LogFactory:getFactory(...)@43 != null
              * 
              *  Postconditions:
              *    init'ed(mLogger)
              */
    43      private static Log mLogger =
    44              LogFactory.getFactory().getInstance(RemoveEntryOperation.class);
    45      
    46      //~ Instance fields ========================================================
    47      
    48      private WeblogEntry data;
    49      private Weblogger roller;
    50      
    51      //~ Constructors ===========================================================
    52      
    53      public RemoveEntryOperation(Weblogger roller, IndexManagerImpl mgr,WeblogEntry data) {
                 /* 
    P/P           *  Method: void org.apache.roller.weblogger.business.search.operations.RemoveEntryOperation(Weblogger, IndexManagerImpl, WeblogEntry)
                  * 
                  *  Postconditions:
                  *    this.data == data
                  *    init'ed(this.data)
                  *    this.manager == mgr
                  *    init'ed(this.manager)
                  *    this.roller == roller
                  *    init'ed(this.roller)
                  */
    54          super(mgr);
    55          this.roller = roller;
    56          this.data = data;
    57      }
    58      
    59      //~ Methods ================================================================
    60      
    61      public void doRun() {
    62          
    63          // since this operation can be run on a separate thread we must treat
    64          // the weblog object passed in as a detached object which is proned to
    65          // lazy initialization problems, so requery for the object now
    66          try {
                     /* 
    P/P               *  Method: void doRun()
                      * 
                      *  Preconditions:
                      *    (soft) mLogger != null
                      *    (soft) this.data != null
                      *    (soft) init'ed(this.reader)
                      *    (soft) org/apache/roller/weblogger/business/search/IndexManagerImpl.mLogger != null
                      *    (soft) org/apache/roller/weblogger/business/search/operations/IndexOperation.mLogger != null
                      *    (soft) this.manager != null
                      *    (soft) init'ed(this.manager.fRAMindex)
                      *    (soft) init'ed(this.manager.indexDir)
                      *    (soft) init'ed(this.manager.useRAMIndex)
                      *    (soft) this.roller != null
                      *    ...
                      * 
                      *  Presumptions:
                      *    javax.persistence.EntityManager:find(...)@216 != null
                      * 
                      *  Postconditions:
                      *    (soft) this.data != null
                      *    init'ed(this.reader)
                      */
    67              WeblogManager wMgr = roller.getWeblogManager();
    68              this.data = wMgr.getWeblogEntry(this.data.getId());
    69          } catch (WebloggerException ex) {
    70              mLogger.error("Error getting weblogentry object", ex);
    71              return;
    72          }
    73          
    74          IndexReader reader = beginDeleting();
    75          try {
    76              if (reader != null) {
    77                  Term term = new Term(FieldConstants.ID, data.getId());
    78                  reader.delete(term);
    79              }
    80          } catch (IOException e) {
    81              mLogger.error("Error deleting doc from index", e);
    82          } finally {
    83              endDeleting();
    84          }
    85      }
    86      
    87      
    88  }