1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
package de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.mktrees.mktab;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.ArrayList;
import java.util.List;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
import de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.MTreeDirectoryEntry;
/**
* Represents an entry in a directory node of a MkTab-Tree. Additionally to a
* MTreeLeafEntry a MkTabDirectoryEntry holds a list of its knn distances for
* parameters k <= k_max.
*
* @author Elke Achtert
*
*/
class MkTabDirectoryEntry<D extends Distance<D>> extends MTreeDirectoryEntry<D> implements MkTabEntry<D> {
private static final long serialVersionUID = 1;
/**
* The maximal number of knn distances to be stored.
*/
private int k_max;
/**
* The aggregated knn distances of the underlying node.
*/
private List<D> knnDistances;
/**
* Empty constructor for serialization purposes.
*/
public MkTabDirectoryEntry() {
super();
}
/**
* Provides a new MkMaxDirectoryEntry with the given parameters.
*
* @param objectID the id of the routing object
* @param parentDistance the distance from the routing object of this entry to
* its parent's routing object
* @param nodeID the id of the underlying node
* @param coveringRadius the covering radius of the entry
* @param knnDistances the aggregated knn distances of the underlying node
*/
public MkTabDirectoryEntry(DBID objectID, D parentDistance, Integer nodeID, D coveringRadius, List<D> knnDistances) {
super(objectID, parentDistance, nodeID, coveringRadius);
this.knnDistances = knnDistances;
this.k_max = knnDistances.size();
}
@Override
public List<D> getKnnDistances() {
return knnDistances;
}
@Override
public void setKnnDistances(List<D> knnDistances) {
this.knnDistances = knnDistances;
}
@Override
public D getKnnDistance(int k) {
if(k > this.k_max) {
throw new IllegalArgumentException("Parameter k = " + k + " is not supported!");
}
return knnDistances.get(k - 1);
}
@Override
public int getK_max() {
return k_max;
}
/**
* Calls the super method and writes the parameter k_max and the knn distances
* of this entry to the specified stream.
*
* @param out the stream to write the object to
* @throws java.io.IOException Includes any I/O exceptions that may occur
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal(out);
out.writeInt(k_max);
for(int i = 0; i < k_max; i++) {
out.writeObject(knnDistances.get(i));
}
}
/**
* Calls the super method and reads the parameter k_max and knn distance of
* this entry from the specified input stream.
*
* @param in the stream to read data from in order to restore the object
* @throws java.io.IOException if I/O errors occur
* @throws ClassNotFoundException If the class for an object being restored
* cannot be found.
*/
@Override
@SuppressWarnings("unchecked")
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
super.readExternal(in);
k_max = in.readInt();
knnDistances = new ArrayList<D>();
for(int i = 0; i < k_max; i++) {
knnDistances.add((D) in.readObject());
}
}
/**
* Indicates whether some other object is "equal to" this one.
*
* @param o the object to be tested
* @return true, if the super method returns true and o is an
* MkTabDirectoryEntry and has the same parameter k_max and
* knnDistances as this entry.
*/
@Override
@SuppressWarnings("unchecked")
public boolean equals(Object o) {
if(this == o) {
return true;
}
if(o == null || getClass() != o.getClass()) {
return false;
}
if(!super.equals(o)) {
return false;
}
final MkTabDirectoryEntry<D> that = (MkTabDirectoryEntry<D>) o;
if(k_max != that.k_max) {
return false;
}
return !(knnDistances != null ? !knnDistances.equals(that.knnDistances) : that.knnDistances != null);
}
}
|
