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
168
169
170
171
172
173
174
175
|
package de.lmu.ifi.dbs.elki.persistent;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2014
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;
/**
* Abstract superclass for pages.
*
* @author Elke Achtert
*/
// todo elke revise comments
public abstract class AbstractExternalizablePage implements ExternalizablePage {
/**
* Serial version
*/
private static final long serialVersionUID = 1;
/**
* The unique id if this page.
*/
private int id;
/**
* The dirty flag of this page.
*/
private boolean dirty;
/**
* Empty constructor for Externalizable interface.
*/
public AbstractExternalizablePage() {
super();
this.id = -1;
}
/**
* Returns the unique id of this Page.
*
* @return the unique id of this Page
*/
@Override
public final int getPageID() {
return id;
}
/**
* Sets the unique id of this Page.
*
* @param id the id to be set
*/
@Override
public final void setPageID(int id) {
this.id = id;
}
/**
* Returns true if this page is dirty, false otherwise.
*
* @return true if this page is dirty, false otherwise
*/
@Override
public final boolean isDirty() {
return dirty;
}
/**
* Sets the dirty flag of this page.
*
* @param dirty the dirty flag to be set
*/
@Override
public final void setDirty(boolean dirty) {
this.dirty = dirty;
}
/**
* The object implements the writeExternal method to save its contents by
* calling the methods of DataOutput for its primitive values or calling the
* writeObject method of ObjectOutput for objects, strings, and arrays.
*
* @param out the stream to write the object to
* @throws java.io.IOException Includes any I/O exceptions that may occur
* @serialData Overriding methods should use this tag to describe the data
* layout of this Externalizable object. List the sequence of
* element types and, if possible, relate the element to a
* public/protected field and/or method of this Externalizable
* class.
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(id);
}
/**
* The object implements the readExternal method to restore its contents by
* calling the methods of DataInput for primitive types and readObject for
* objects, strings and arrays. The readExternal method must read the values
* in the same sequence and with the same types as were written by
* writeExternal.
*
* @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
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
id = in.readInt();
}
/**
* Returns a string representation of the object.
*
* @return a string representation of the object
*/
@Override
public String toString() {
return Integer.toString(id);
}
/**
* Indicates whether some other object is "equal to" this one.
*
* @param o the object to be tested
* @return true, if o is an AbstractNode and has the same id and the same
* entries as this node.
*/
@Override
public boolean equals(Object o) {
if(this == o) {
return true;
}
if(o == null || getClass() != o.getClass()) {
return false;
}
final AbstractExternalizablePage that = (AbstractExternalizablePage) o;
return id == that.getPageID();
}
/**
* Returns as hash code value for this node the id of this node.
*
* @return the id of this node
*/
@Override
public int hashCode() {
return id;
}
}
|
