|
1
|
/*******************************************************************************
|
|
2
|
* Copyright (c) 2006, 2010 IBM Corporation and others.
|
|
3
|
* All rights reserved. This program and the accompanying materials
|
|
4
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
5
|
* which accompanies this distribution, and is available at
|
|
6
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
7
|
*
|
|
8
|
* Contributors:
|
|
9
|
* IBM Corporation - initial API and implementation
|
|
10
|
*******************************************************************************/
|
|
11
|
|
|
12
|
package org.eclipse.ui.internal.navigator.extensions;
|
|
13
|
|
|
14
|
import java.util.Comparator;
|
|
15
|
|
|
16
|
import org.eclipse.ui.navigator.INavigatorContentDescriptor;
|
|
17
|
import org.eclipse.ui.navigator.INavigatorContentExtension;
|
|
18
|
|
|
19
|
/**
|
|
20
|
* @since 3.2
|
|
21
|
*
|
|
22
|
*/
|
|
23
|
public class ExtensionSequenceNumberComparator implements Comparator {
|
|
24
|
|
|
25
|
/**
|
|
26
|
* The initialized singleton instance.
|
|
27
|
*/
|
|
28
|
public static final ExtensionSequenceNumberComparator INSTANCE = new ExtensionSequenceNumberComparator(true);
|
|
29
|
|
|
30
|
/**
|
|
31
|
* The initialized singleton instance.
|
|
32
|
*/
|
|
33
|
public static final ExtensionSequenceNumberComparator DESCENDING = new ExtensionSequenceNumberComparator(false);
|
|
34
|
|
|
35
|
private final int sortAscending;
|
|
36
|
|
|
37
|
/**
|
|
38
|
* Creates an instance that sorts according to the given boolean flag.
|
|
39
|
*
|
|
40
|
* @param toSortAscending
|
|
41
|
* <code>true</code> for ascending sort order or
|
|
42
|
* <code>false</code> for descending sort order.
|
|
43
|
*/
|
|
44
|
public ExtensionSequenceNumberComparator(boolean toSortAscending) {
|
|
45
|
sortAscending = toSortAscending ? 1 : -1;
|
|
46
|
}
|
|
47
|
|
|
48
|
/*
|
|
49
|
* (non-Javadoc)
|
|
50
|
*
|
|
51
|
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
|
|
52
|
*/
|
|
53
|
public int compare(Object o1, Object o2) {
|
|
54
|
|
|
55
|
INavigatorContentDescriptor lvalue = null;
|
|
56
|
INavigatorContentDescriptor rvalue = null;
|
|
57
|
|
|
58
|
if (o1 instanceof INavigatorContentDescriptor) {
|
|
59
|
lvalue = (INavigatorContentDescriptor) o1;
|
|
60
|
} else if (o1 instanceof NavigatorContentExtension) {
|
|
61
|
lvalue = ((NavigatorContentExtension) o1).getDescriptor();
|
|
62
|
}
|
|
63
|
|
|
64
|
if (o2 instanceof INavigatorContentDescriptor) {
|
|
65
|
rvalue = (INavigatorContentDescriptor) o2;
|
|
66
|
} else if (o2 instanceof INavigatorContentExtension) {
|
|
67
|
rvalue = ((NavigatorContentExtension) o2).getDescriptor();
|
|
68
|
}
|
|
69
|
|
|
70
|
if (lvalue == null || rvalue == null) {
|
|
71
|
return -1 * sortAscending;
|
|
72
|
}
|
|
73
|
|
|
74
|
int c = lvalue.getSequenceNumber() - rvalue.getSequenceNumber();
|
|
75
|
if (c != 0) {
|
|
76
|
return c * sortAscending;
|
|
77
|
}
|
|
78
|
return 0;
|
|
79
|
|
|
80
|
}
|
|
81
|
|
|
82
|
}
|