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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.managed;
21  
22  
23  import java.util.List;
24  
25  import org.apache.directory.mavibot.btree.Tuple;
26  
27  
28  /**
29   * The result of a delete operation, when the child has not been merged, and when
30   * we have borrowed an element from the left sibling. It contains the
31   * reference to the modified page, and the removed element.
32   * 
33   * @param <K> The type for the Key
34   * @param <V> The type for the stored value
35  
36   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
37   */
38  /* No qualifier */class BorrowedFromLeftResult<K, V> extends AbstractBorrowedFromSiblingResult<K, V>
39  {
40      /**
41       * The default constructor for BorrowedFromLeftResult.
42       * 
43       * @param modifiedPage The modified page
44       * @param modifiedSibling The modified sibling
45       * @param removedElement The removed element (can be null if the key wasn't present in the tree)
46       */
47      /* No qualifier */BorrowedFromLeftResult( Page<K, V> modifiedPage, Page<K, V> modifiedSibling,
48          Tuple<K, V> removedElement )
49      {
50          super( modifiedPage, modifiedSibling, removedElement, AbstractBorrowedFromSiblingResult.SiblingPosition.LEFT );
51      }
52  
53  
54      /**
55       * A constructor for BorrowedFromLeftResult which takes a list of copied pages.
56       * 
57       * @param copiedPages the list of copied pages
58       * @param modifiedPage The modified page
59       * @param modifiedSibling The modified sibling
60       * @param removedElement The removed element (can be null if the key wasn't present in the tree)
61       */
62      /* No qualifier */BorrowedFromLeftResult( List<Page<K, V>> copiedPages, Page<K, V> modifiedPage,
63          Page<K, V> modifiedSibling,
64          Tuple<K, V> removedElement )
65      {
66          super( copiedPages, modifiedPage, modifiedSibling, removedElement,
67              AbstractBorrowedFromSiblingResult.SiblingPosition.LEFT );
68      }
69  
70  
71      /**
72       * @see Object#toString()
73       */
74      public String toString()
75      {
76          StringBuilder sb = new StringBuilder();
77  
78          sb.append( "Borrowed from left" );
79          sb.append( super.toString() );
80  
81          return sb.toString();
82      }
83  }