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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.directory.mavibot.btree;
21  
22  
23  import java.util.List;
24  
25  
26  /**
27   * The result of a delete operation, when the child has not been merged, and when
28   * we have borrowed an element from the left sibling. It contains the
29   * reference to the modified page, and the removed element.
30   * 
31   * @param <K> The type for the Key
32   * @param <V> The type for the stored value
33  
34   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35   */
36  /* No qualifier*/class BorrowedFromLeftResult<K, V> extends AbstractBorrowedFromSiblingResult<K, V>
37  {
38      /**
39       * The default constructor for BorrowedFromLeftResult.
40       * 
41       * @param modifiedPage The modified page
42       * @param modifiedSibling The modified sibling
43       * @param removedElement The removed element (can be null if the key wasn't present in the tree)
44       */
45      public BorrowedFromLeftResult( Page<K, V> modifiedPage, Page<K, V> modifiedSibling,
46          Tuple<K, V> removedElement )
47      {
48          super( modifiedPage, modifiedSibling, removedElement, AbstractBorrowedFromSiblingResult.SiblingPosition.LEFT );
49      }
50  
51  
52      /**
53       * A constructor for BorrowedFromLeftResult which takes a list of copied pages.
54       * 
55       * @param copiedPages the list of copied pages
56       * @param modifiedPage The modified page
57       * @param modifiedSibling The modified sibling
58       * @param removedElement The removed element (can be null if the key wasn't present in the tree)
59       */
60      public BorrowedFromLeftResult( List<Page<K, V>> copiedPages, Page<K, V> modifiedPage,
61          Page<K, V> modifiedSibling,
62          Tuple<K, V> removedElement )
63      {
64          super( copiedPages, modifiedPage, modifiedSibling, removedElement,
65              AbstractBorrowedFromSiblingResult.SiblingPosition.LEFT );
66      }
67  
68  
69      /**
70       * @see Object#toString()
71       */
72      public String toString()
73      {
74          StringBuilder sb = new StringBuilder();
75  
76          sb.append( "Borrowed from left" );
77          sb.append( super.toString() );
78  
79          return sb.toString();
80      }
81  }