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/*******************************************************************************
* Copyright (c) 2009 Martin Lippert 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:
* Martin Lippert initial implementation
*******************************************************************************/
package org.eclipse.equinox.weaving.aspectj.loadtime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.aspectj.weaver.loadtime.definition.Definition;
import org.eclipse.equinox.service.weaving.ISupplementerRegistry;
import org.eclipse.equinox.weaving.aspectj.AspectAdmin;
import org.eclipse.equinox.weaving.aspectj.AspectConfiguration;
import org.eclipse.osgi.service.resolver.BundleDescription;
import org.eclipse.osgi.service.resolver.ExportPackageDescription;
import org.eclipse.osgi.service.resolver.State;
import org.eclipse.osgi.util.ManifestElement;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
/**
* The aspect resolver is responsible for finding the right connections between
* bundles and aspects. It calculates the set of aspects that should be woven
* into a specific bundle, depending on the resolved wires of the bundle and the
* aspects declared by the wired bundles.
*
* @author Martin Lippert
*/
public class AspectResolver {
private final AspectAdmin aspectAdmin;
private final State state;
private final ISupplementerRegistry supplementerRegistry;
private final BundleContext weavingBundleContext;
/**
* Creates a new instance of an aspect resolver for the given state. This
* resolver can be used to resolve aspect configurations for bundles. It
* does not carry any own state, it just uses the injected components to
* retrieve the necessary informaton to determine which aspects to weave
* into which bundles.
*
* @param state The state of the OSGi framework (contains wiring
* information)
* @param supplementerRegistry The supplementer registry
* @param aspectAdmin The aspect admin, which tells us which bundle exports
* which aspects
* @param bundleContext The bundle context in which the aspect resolver is
* used
*/
public AspectResolver(final State state,
final ISupplementerRegistry supplementerRegistry,
final AspectAdmin aspectAdmin, final BundleContext bundleContext) {
this.state = state;
this.supplementerRegistry = supplementerRegistry;
this.aspectAdmin = aspectAdmin;
this.weavingBundleContext = bundleContext;
}
/**
* Resolve the aspects to be woven into the given bundle
*
* @param bundle The bundle in which the aspects should be woven into
* @param bundleDescription The description of the bundle to be woven into
* @return The configuration of aspects what should be woven into the bundle
*/
public AspectConfiguration resolveAspectsFor(final Bundle bundle,
final BundleDescription bundleDescription) {
final List<String> fingerprintElements = new ArrayList<String>();
final List<Definition> definitions = resolveAspectsForBundle(
fingerprintElements, bundle, bundleDescription);
final Definition[] foundDefinitions = definitions
.toArray(new Definition[definitions.size()]);
Collections.sort(fingerprintElements);
final StringBuilder fingerprint = new StringBuilder();
final Iterator<String> iterator = fingerprintElements.iterator();
while (iterator.hasNext()) {
final String element = iterator.next();
fingerprint.append(element);
fingerprint.append(';');
}
return new AspectConfiguration(bundle, foundDefinitions, fingerprint
.toString());
}
private int getApplyAspectsPolicy(final ManifestElement[] headers,
final String manifestValue) {
int result = AspectAdmin.ASPECT_APPLY_POLICY_NOT_DEFINED;
if (headers != null) {
for (int i = 0; i < headers.length; i++) {
if (headers[i].getValue().equals(manifestValue)) {
final String directive = headers[i]
.getDirective(AspectAdmin.ASPECT_APPLY_POLICY_DIRECTIVE);
if ("true".equals(directive)) { //$NON-NLS-1$
result = AspectAdmin.ASPECT_APPLY_POLICY_TRUE;
} else if ("false".equals(directive)) { //$NON-NLS-1$
result = AspectAdmin.ASPECT_APPLY_POLICY_FALSE;
}
}
}
}
return result;
}
private String getBundleVersion(final Bundle bundle) {
return state.getBundle(bundle.getBundleId()).getVersion().toString();
}
private List<Definition> resolveAspectsForBundle(
final List<String> fingerprintElements, final Bundle bundle,
final BundleDescription bundleDescription) {
final List<Definition> result = new ArrayList<Definition>();
if (weavingBundleContext != null) {
Definition aspects = null;
// fragments
final BundleDescription[] fragments = bundleDescription
.getFragments();
for (int i = 0; i < fragments.length; i++) {
final Bundle fragmentBundle = weavingBundleContext
.getBundle(fragments[i].getBundleId());
if (fragmentBundle != null) {
aspects = aspectAdmin.getAspectDefinition(fragmentBundle);
if (aspects != null) {
result.add(aspects);
fingerprintElements.add(fragmentBundle
.getSymbolicName()
+ ":" //$NON-NLS-1$
+ fragments[i].getVersion().toString());
}
}
}
// required bundles
final BundleDescription[] resolvedRequires = bundleDescription
.getResolvedRequires();
ManifestElement[] requireHeaders = null;
if (resolvedRequires.length > 0) {
try {
requireHeaders = ManifestElement
.parseHeader(Constants.REQUIRE_BUNDLE,
(String) bundle.getHeaders().get(
Constants.REQUIRE_BUNDLE));
} catch (final BundleException e) {
}
}
for (int i = 0; i < resolvedRequires.length; i++) {
final Bundle requiredBundle = weavingBundleContext
.getBundle(resolvedRequires[i].getBundleId());
if (requiredBundle != null) {
final int applyPolicy = getApplyAspectsPolicy(
requireHeaders, requiredBundle.getSymbolicName());
aspects = aspectAdmin.resolveRequiredBundle(requiredBundle,
applyPolicy);
if (aspects != null) {
result.add(aspects);
fingerprintElements.add(requiredBundle
.getSymbolicName()
+ ":" //$NON-NLS-1$
+ resolvedRequires[i].getVersion().toString());
}
}
}
// imported packages
final ExportPackageDescription[] resolvedImports = bundleDescription
.getResolvedImports();
ManifestElement[] importHeaders = null;
if (resolvedImports.length > 0) {
try {
importHeaders = ManifestElement
.parseHeader(Constants.IMPORT_PACKAGE,
(String) bundle.getHeaders().get(
Constants.IMPORT_PACKAGE));
} catch (final BundleException e) {
}
}
for (int i = 0; i < resolvedImports.length; i++) {
final Bundle exportingBundle = weavingBundleContext
.getBundle(resolvedImports[i].getExporter()
.getBundleId());
if (exportingBundle != null) {
final String importedPackage = resolvedImports[i].getName();
final int applyPolicy = getApplyAspectsPolicy(
importHeaders, importedPackage);
aspects = aspectAdmin.resolveImportedPackage(
exportingBundle, importedPackage, applyPolicy);
if (aspects != null) {
result.add(aspects);
fingerprintElements.add(importedPackage + ":" //$NON-NLS-1$
+ resolvedImports[i].getVersion().toString());
}
}
}
// supplementers
final Bundle[] supplementers = this.supplementerRegistry
.getSupplementers(bundleDescription.getBundleId());
for (int i = 0; i < supplementers.length; i++) {
aspects = aspectAdmin
.getExportedAspectDefinitions(supplementers[i]);
if (aspects != null) {
result.add(aspects);
fingerprintElements.add(supplementers[i].getSymbolicName()
+ ":" //$NON-NLS-1$
+ getBundleVersion(supplementers[i]));
}
}
// this bundle
if (result.size() > 0) {
aspects = aspectAdmin.getAspectDefinition(bundle);
if (aspects != null) {
result.add(aspects);
fingerprintElements.add(bundle.getSymbolicName() + ":" //$NON-NLS-1$
+ bundleDescription.getVersion().toString());
}
}
}
return result;
}
}
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