blob: 95d3f11f9a0d5cc2fcf8b1af1e15d0d37df301cb (
plain) (
blame)
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
|
/*******************************************************************************
* Copyright (c) 2011, 2012 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.runtime.extensions;
import java.util.Comparator;
import org.eclipse.core.runtime.IExtension;
/**
* Extension point comparator implementation.
* <p>
* The comparator assure that extension are read in a predictable order.
* <p>
* The order of the extensions is defined as following:<br>
* <ul><li>Extensions contributed by our own plug-ins (<code>org.eclipse.tcf.te.*</code>)
* in ascending alphabetic order and</li>
* <li>Extensions contributed by any other plug-in in ascending alphabetic order.</li>
* <li>Extensions contributed by the same plug-in in ascending alphabetic order by the
* extensions unique id</li>
*/
public class ExtensionPointComparator implements Comparator<IExtension> {
private final static String OWN_PLUGINS_PATTERN = "org.eclipse.tcf.te."; //$NON-NLS-1$
/* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
@Override
public int compare(IExtension o1, IExtension o2) {
// We ignore any comparisation with null and
if (o1 == null || o2 == null) return 0;
// Check if it is the exact same element
if (o1 == o2) return 0;
// The extensions are compared by the unique id of the contributing plugin first
String contributor1 = o1.getContributor().getName();
String contributor2 = o2.getContributor().getName();
// Contributions from our own plug-ins comes before 3rdParty plug-ins
if (contributor1.startsWith(OWN_PLUGINS_PATTERN) && !contributor2.startsWith(OWN_PLUGINS_PATTERN))
return -1;
if (!contributor1.startsWith(OWN_PLUGINS_PATTERN) && contributor2.startsWith(OWN_PLUGINS_PATTERN))
return 1;
if (contributor1.startsWith(OWN_PLUGINS_PATTERN) && contributor2.startsWith(OWN_PLUGINS_PATTERN)) {
int value = contributor1.compareTo(contributor2);
// Within the same plug-in, the extension are sorted by their unique id (if available)
if (value == 0 && o1.getUniqueIdentifier() != null && o2.getUniqueIdentifier() != null)
return o1.getUniqueIdentifier().compareTo(o2.getUniqueIdentifier());
// Otherwise, just return the comparisation result from the contributors
return value;
}
// Contributions from all other plug-ins are sorted alphabetical
int value = contributor1.compareTo(contributor2);
// Within the same plug-in, the extension are sorted by their unique id (if available)
if (value == 0 && o1.getUniqueIdentifier() != null && o2.getUniqueIdentifier() != null)
return o1.getUniqueIdentifier().compareTo(o2.getUniqueIdentifier());
// Otherwise, just return the comparisation result from the contributors
return value;
}
}
|
