blob: ac0a446702b4ee94d21bc6030d3689f63dbe4aa9 (
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
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
|
/*******************************************************************************
* Copyright (c) 2005, 2012 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.loader.buddy;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import org.eclipse.osgi.container.ModuleContainer;
import org.eclipse.osgi.internal.container.Capabilities;
import org.eclipse.osgi.internal.loader.BundleLoader;
import org.osgi.framework.Bundle;
import org.osgi.framework.namespace.HostNamespace;
import org.osgi.framework.namespace.PackageNamespace;
import org.osgi.framework.wiring.BundleCapability;
import org.osgi.framework.wiring.BundleRevision;
import org.osgi.framework.wiring.BundleWire;
import org.osgi.framework.wiring.BundleWiring;
import org.osgi.framework.wiring.FrameworkWiring;
import org.osgi.resource.Namespace;
/**
* Global policy is an implementation of a buddy policy. It is responsible
* for looking up a class within the global set of exported classes. If multiple
* version of the same package are exported in the system, the exported package
* with the highest version will be returned.
*/
public class GlobalPolicy implements IBuddyPolicy {
private FrameworkWiring frameworkWiring;
public GlobalPolicy(FrameworkWiring frameworkWiring) {
this.frameworkWiring = frameworkWiring;
}
@Override
public Class<?> loadClass(String name) {
return getExportingBundles(BundleLoader.getPackageName(name)) //
.stream().findFirst().map(b -> {
try {
return b.loadClass(name);
} catch (ClassNotFoundException e) {
return null;
}
}).orElseGet(null);
}
@Override
public URL loadResource(String name) {
return getExportingBundles(BundleLoader.getResourcePackageName(name)) //
.stream().findFirst().map(b -> {
return b.getResource(name);
}).orElseGet(null);
}
@Override
public Enumeration<URL> loadResources(String name) {
Enumeration<URL> results = null;
Collection<Bundle> exporters = getExportingBundles(name);
for (Bundle exporter : exporters) {
try {
results = BundleLoader.compoundEnumerations(results, exporter.getResources(name));
}catch (IOException e) {
//ignore IO problems and try next package
}
}
return results;
}
private Collection<Bundle> getExportingBundles(String pkgName) {
Collection<Bundle> result = new ArrayList<>();
String filter = "(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkgName + ")"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
Map<String, String> directives = Collections
.<String, String>singletonMap(Namespace.REQUIREMENT_FILTER_DIRECTIVE, filter);
Map<String, Boolean> attributes = Collections.singletonMap(Capabilities.SYNTHETIC_REQUIREMENT, Boolean.TRUE);
Collection<BundleCapability> packages = frameworkWiring.findProviders(
ModuleContainer.createRequirement(PackageNamespace.PACKAGE_NAMESPACE, directives, attributes));
for (BundleCapability pkg : packages) {
if ((pkg.getRevision().getTypes() & BundleRevision.TYPE_FRAGMENT) != 0) {
// use the hosts
BundleWiring wiring = pkg.getRevision().getWiring();
for (BundleWire hostWire : wiring.getRequiredWires(HostNamespace.HOST_NAMESPACE)) {
result.add(hostWire.getProvider().getBundle());
}
} else {
result.add(pkg.getRevision().getBundle());
}
}
return result;
}
}
|
