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org.apache.xbean.osgi.bundle.util.BundleClassFinder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.xbean.osgi.bundle.util;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import org.apache.xbean.osgi.bundle.util.BundleDescription.ExportPackage;
import org.apache.xbean.osgi.bundle.util.BundleDescription.HeaderEntry;
import org.apache.xbean.osgi.bundle.util.BundleDescription.RequireBundle;
import org.osgi.framework.Bundle;
import org.osgi.service.packageadmin.ExportedPackage;
import org.osgi.service.packageadmin.PackageAdmin;
import org.osgi.service.packageadmin.RequiredBundle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Finds all available classes to a bundle by scanning Bundle-ClassPath,
* Import-Package, and Require-Bundle headers of the given bundle and its fragments.
* DynamicImport-Package header is not considered during scanning.
*
* @version $Rev: 1160131 $ $Date: 2011-08-22 09:07:20 +0200 (Mon, 22 Aug 2011) $
*/
public class BundleClassFinder {
private static final Logger logger = LoggerFactory.getLogger(BundleClassFinder.class);
public static final ClassDiscoveryFilter FULL_CLASS_DISCOVERY_FILTER = new DummyDiscoveryFilter();
public static final ClassDiscoveryFilter IMPORTED_PACKAGE_EXCLUSIVE_FILTER = new NonImportedPackageDiscoveryFilter();
protected static final String EXT = ".class";
protected static final String PATTERN = "*.class";
protected Bundle bundle;
protected PackageAdmin packageAdmin;
private Map> classMap;
protected ClassDiscoveryFilter discoveryFilter;
public BundleClassFinder(PackageAdmin packageAdmin, Bundle bundle) {
this(packageAdmin, bundle, FULL_CLASS_DISCOVERY_FILTER);
}
public BundleClassFinder(PackageAdmin packageAdmin, Bundle bundle, ClassDiscoveryFilter discoveryFilter) {
this.packageAdmin = packageAdmin;
this.bundle = BundleUtils.unwrapBundle(bundle);
this.discoveryFilter = discoveryFilter;
}
public List> loadClasses(Set classes) {
List> loadedClasses = new ArrayList>(classes.size());
for (String clazz : classes) {
try {
loadedClasses.add(bundle.loadClass(clazz));
} catch (Exception ignore) {
// ignore
}
}
return loadedClasses;
}
/**
* Finds all available classes to the bundle. Some of the classes in the returned set
* might not be loadable.
*
* @return classes visible to the bundle. Not all classes returned might be loadable.
*/
public Set find() {
Set classes = new LinkedHashSet();
classMap = new HashMap>();
if (discoveryFilter.rangeDiscoveryRequired(DiscoveryRange.IMPORT_PACKAGES)) {
scanImportPackages(classes, bundle, bundle);
}
if (discoveryFilter.rangeDiscoveryRequired(DiscoveryRange.REQUIRED_BUNDLES)) {
scanRequireBundles(classes, bundle);
}
if (discoveryFilter.rangeDiscoveryRequired(DiscoveryRange.BUNDLE_CLASSPATH)) {
scanBundleClassPath(classes, bundle);
}
if (discoveryFilter.rangeDiscoveryRequired(DiscoveryRange.FRAGMENT_BUNDLES)) {
Bundle[] fragments = packageAdmin.getFragments(bundle);
if (fragments != null) {
for (Bundle fragment : fragments) {
scanImportPackages(classes, bundle, fragment);
scanRequireBundles(classes, fragment);
scanBundleClassPath(classes, fragment);
}
}
}
classMap.clear();
return classes;
}
protected boolean isClassAcceptable(String name, InputStream in) throws IOException {
return true;
}
protected boolean isClassAcceptable(URL url) {
return true;
}
protected BundleClassFinder createSubBundleClassFinder(PackageAdmin packageAdmin, Bundle bundle, ClassDiscoveryFilter classDiscoveryFilter) {
return new BundleClassFinder(packageAdmin, bundle, classDiscoveryFilter);
}
protected String toJavaStyleClassName(String name) {
if (name.endsWith(EXT)) {
name = name.substring(0, name.length() - EXT.length());
}
name = name.replace('/', '.');
return name;
}
/**
* Get the normal Java style package name from the parameter className.
* If the className is ended with .class extension, e.g. /org/apache/geronimo/TestCass.class or org.apache.geronimo.TestClass.class,
* then org/apache/geronimo is returned
* If the className is not ended with .class extension, e.g. /org/apache/geronimo/TestCass or org.apache.geronimo.TestClass,
* then org/apache/geronimo is returned
* @return Normal Java style package name, should be like org.apache.geronimo
*/
protected String toJavaStylePackageName(String className) {
if (className.endsWith(EXT)) {
className = className.substring(0, className.length() - EXT.length());
}
className = className.replace('/', '.');
int iLastDotIndex = className.lastIndexOf('.');
if (iLastDotIndex != -1) {
return className.substring(0, iLastDotIndex);
} else {
return "";
}
}
private Set findAllClasses(Bundle bundle, ClassDiscoveryFilter userClassDiscoveryFilter, Set exportedPackageNames) {
Set allClasses = classMap.get(bundle);
if (allClasses == null) {
BundleClassFinder finder = createSubBundleClassFinder(packageAdmin, bundle, new ImportExclusivePackageDiscoveryFilterAdapter(userClassDiscoveryFilter, exportedPackageNames));
allClasses = finder.find();
classMap.put(bundle, allClasses);
}
return allClasses;
}
private Set findAllClasses(Bundle bundle, String packageName) {
Set allClasses = classMap.get(bundle);
if (allClasses == null) {
BundleClassFinder finder = createSubBundleClassFinder(packageAdmin, bundle, new ImportExclusivePackageDiscoveryFilter(packageName));
allClasses = finder.find();
classMap.put(bundle, allClasses);
}
return allClasses;
}
private void scanImportPackages(Collection classes, Bundle host, Bundle fragment) {
BundleDescription description = new BundleDescription(fragment.getHeaders());
List imports = description.getExternalImports();
for (BundleDescription.ImportPackage packageImport : imports) {
String packageName = packageImport.getName();
if (discoveryFilter.packageDiscoveryRequired(packageName)) {
ExportedPackage[] exports = packageAdmin.getExportedPackages(packageName);
Bundle wiredBundle = isWired(host, exports);
if (wiredBundle != null) {
Set allClasses = findAllClasses(wiredBundle, packageName);
classes.addAll(allClasses);
}
}
}
}
private void scanRequireBundles(Collection classes, Bundle bundle) {
BundleDescription description = new BundleDescription(bundle.getHeaders());
List requiredBundleList = description.getRequireBundle();
for (RequireBundle requiredBundle : requiredBundleList) {
RequiredBundle[] requiredBundles = packageAdmin.getRequiredBundles(requiredBundle.getName());
Bundle wiredBundle = isWired(bundle, requiredBundles);
if (wiredBundle != null) {
BundleDescription wiredBundleDescription = new BundleDescription(wiredBundle.getHeaders());
List exportPackages = wiredBundleDescription.getExportPackage();
Set exportedPackageNames = new HashSet();
for (ExportPackage exportPackage : exportPackages) {
exportedPackageNames.add(exportPackage.getName());
}
Set allClasses = findAllClasses(wiredBundle, discoveryFilter, exportedPackageNames);
classes.addAll(allClasses);
}
}
}
private void scanBundleClassPath(Collection resources, Bundle bundle) {
BundleDescription description = new BundleDescription(bundle.getHeaders());
List paths = description.getBundleClassPath();
if (paths.isEmpty()) {
scanDirectory(resources, bundle, "/");
} else {
for (HeaderEntry path : paths) {
String name = path.getName();
if (name.equals(".") || name.equals("/")) {
// scan root
scanDirectory(resources, bundle, "/");
} else if (name.endsWith(".jar") || name.endsWith(".zip")) {
// scan embedded jar/zip
scanZip(resources, bundle, name);
} else {
// assume it's a directory
scanDirectory(resources, bundle, "/" + name);
}
}
}
}
private void scanDirectory(Collection classes, Bundle bundle, String basePath) {
basePath = addSlash(basePath);
if (!discoveryFilter.directoryDiscoveryRequired(basePath)) {
return;
}
Enumeration e = bundle.findEntries(basePath, PATTERN, true);
if (e != null) {
while (e.hasMoreElements()) {
URL u = e.nextElement();
String entryName = u.getPath().substring(basePath.length());
if (discoveryFilter.packageDiscoveryRequired(toJavaStylePackageName(entryName))) {
if (isClassAcceptable(u)) {
classes.add(toJavaStyleClassName(entryName));
}
}
}
}
}
private void scanZip(Collection classes, Bundle bundle, String zipName) {
if (!discoveryFilter.jarFileDiscoveryRequired(zipName)) {
return;
}
URL zipEntry = bundle.getEntry(zipName);
if (zipEntry == null) {
return;
}
ZipInputStream in = null;
try {
in = new ZipInputStream(zipEntry.openStream());
ZipEntry entry;
while ((entry = in.getNextEntry()) != null) {
String name = entry.getName();
if (name.endsWith(EXT) && discoveryFilter.packageDiscoveryRequired(toJavaStylePackageName(name))) {
if (isClassAcceptable(name, in)) {
classes.add(toJavaStyleClassName(name));
}
}
}
} catch (IOException ignore) {
logger.warn("Fail to check zip file " + zipName, ignore);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
}
}
protected String addSlash(String name) {
if (!name.endsWith("/")) {
name = name + "/";
}
return name;
}
protected Bundle isWired(Bundle bundle, ExportedPackage[] exports) {
if (exports != null) {
for (ExportedPackage exportedPackage : exports) {
Bundle[] importingBundles = exportedPackage.getImportingBundles();
if (importingBundles != null) {
for (Bundle importingBundle : importingBundles) {
if (importingBundle == bundle) {
return exportedPackage.getExportingBundle();
}
}
}
}
}
return null;
}
protected Bundle isWired(Bundle bundle, RequiredBundle[] requiredBundles) {
if (requiredBundles != null) {
for (RequiredBundle requiredBundle : requiredBundles) {
Bundle[] requiringBundles = requiredBundle.getRequiringBundles();
if (requiringBundles != null) {
for (Bundle requiringBundle : requiringBundles) {
if (requiringBundle == bundle) {
return requiredBundle.getBundle();
}
}
}
}
}
return null;
}
public static class DummyDiscoveryFilter implements ClassDiscoveryFilter {
public boolean directoryDiscoveryRequired(String url) {
return true;
}
public boolean rangeDiscoveryRequired(DiscoveryRange discoveryRange) {
return true;
}
public boolean jarFileDiscoveryRequired(String url) {
return true;
}
public boolean packageDiscoveryRequired(String packageName) {
return true;
}
}
public static class NonImportedPackageDiscoveryFilter implements ClassDiscoveryFilter {
public boolean directoryDiscoveryRequired(String url) {
return true;
}
public boolean jarFileDiscoveryRequired(String url) {
return true;
}
public boolean packageDiscoveryRequired(String packageName) {
return true;
}
public boolean rangeDiscoveryRequired(DiscoveryRange discoveryRange) {
return !discoveryRange.equals(DiscoveryRange.IMPORT_PACKAGES);
}
}
private static class ImportExclusivePackageDiscoveryFilter implements ClassDiscoveryFilter {
private String expectedPckageName;
public ImportExclusivePackageDiscoveryFilter(String expectedPckageName) {
this.expectedPckageName = expectedPckageName;
}
public boolean directoryDiscoveryRequired(String url) {
return true;
}
public boolean jarFileDiscoveryRequired(String url) {
return true;
}
public boolean packageDiscoveryRequired(String packageName) {
return expectedPckageName.equals(packageName);
}
public boolean rangeDiscoveryRequired(DiscoveryRange discoveryRange) {
return !discoveryRange.equals(DiscoveryRange.IMPORT_PACKAGES);
}
}
private static class ImportExclusivePackageDiscoveryFilterAdapter implements ClassDiscoveryFilter {
private Set acceptedPackageNames;
private ClassDiscoveryFilter classDiscoveryFilter;
public ImportExclusivePackageDiscoveryFilterAdapter(ClassDiscoveryFilter classDiscoveryFilter, Set acceptedPackageNames) {
this.classDiscoveryFilter = classDiscoveryFilter;
this.acceptedPackageNames = acceptedPackageNames;
}
public boolean directoryDiscoveryRequired(String url) {
return true;
}
public boolean jarFileDiscoveryRequired(String url) {
return true;
}
public boolean packageDiscoveryRequired(String packageName) {
return acceptedPackageNames.contains(packageName) && classDiscoveryFilter.packageDiscoveryRequired(packageName);
}
public boolean rangeDiscoveryRequired(DiscoveryRange discoveryRange) {
return !discoveryRange.equals(DiscoveryRange.IMPORT_PACKAGES);
}
}
}
