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/*******************************************************************************
* Copyright (c) 2009, 2017 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.director;
import java.util.*;
import org.eclipse.equinox.p2.metadata.*;
import org.eclipse.equinox.p2.query.QueryUtil;
public class AttachmentHelper {
private static final IInstallableUnitFragment[] NO_FRAGMENTS = new IInstallableUnitFragment[0];
public static Collection<IInstallableUnit> attachFragments(Iterator<IInstallableUnit> toAttach, Map<IInstallableUnitFragment, List<IInstallableUnit>> fragmentsToIUs) {
Map<IInstallableUnit, IInstallableUnitFragment[]> fragmentBindings = new HashMap<>();
//Build a map inverse of the one provided in input (host --> List of fragments)
Map<IInstallableUnit, List<IInstallableUnitFragment>> iusToFragment = new HashMap<>(fragmentsToIUs.size());
for (Map.Entry<IInstallableUnitFragment, List<IInstallableUnit>> mapping : fragmentsToIUs.entrySet()) {
IInstallableUnitFragment fragment = mapping.getKey();
List<IInstallableUnit> existingMatches = mapping.getValue();
for (IInstallableUnit host : existingMatches) {
List<IInstallableUnitFragment> potentialFragments = iusToFragment.get(host);
if (potentialFragments == null) {
potentialFragments = new ArrayList<>();
iusToFragment.put(host, potentialFragments);
}
potentialFragments.add(fragment);
}
}
for (Map.Entry<IInstallableUnit, List<IInstallableUnitFragment>> entry : iusToFragment.entrySet()) {
IInstallableUnit hostIU = entry.getKey();
List<IInstallableUnitFragment> potentialIUFragments = entry.getValue();
ArrayList<IInstallableUnitFragment> applicableFragments = new ArrayList<>();
for (IInstallableUnitFragment potentialFragment : potentialIUFragments) {
if (hostIU.equals(potentialFragment))
continue;
// Check to make sure the host meets the requirements of the fragment
Collection<IRequirement> reqsFromFragment = potentialFragment.getHost();
boolean match = true;
boolean requirementMatched = false;
for (Iterator<IRequirement> iterator = reqsFromFragment.iterator(); iterator.hasNext() && match == true;) {
IRequirement reqs = iterator.next();
requirementMatched = false;
if (hostIU.satisfies(reqs))
requirementMatched = true;
if (requirementMatched == false) {
match = false;
break;
}
}
if (match) {
applicableFragments.add(potentialFragment);
}
}
IInstallableUnitFragment theFragment = null;
int specificityLevel = 0;
LinkedList<IInstallableUnitFragment> fragments = new LinkedList<>();
for (IInstallableUnitFragment fragment : applicableFragments) {
if (isTranslation(fragment)) {
fragments.add(fragment);
continue;
}
if (fragment.getHost().size() > specificityLevel) {
theFragment = fragment;
specificityLevel = fragment.getHost().size();
}
}
if (theFragment != null)
fragments.addFirst(theFragment);
if (!fragments.isEmpty())
fragmentBindings.put(hostIU, fragments.toArray(new IInstallableUnitFragment[fragments.size()]));
}
//build the collection of resolved IUs
Collection<IInstallableUnit> result = new HashSet<>();
while (toAttach.hasNext()) {
IInstallableUnit iu = toAttach.next();
if (iu == null)
continue;
//just return fragments as they are
if (QueryUtil.isFragment(iu)) {
result.add(iu);
continue;
}
//return a new IU that combines the IU with its bound fragments
IInstallableUnitFragment[] fragments = fragmentBindings.get(iu);
if (fragments == null)
fragments = NO_FRAGMENTS;
result.add(MetadataFactory.createResolvedInstallableUnit(iu, fragments));
}
return result;
}
private static boolean isTranslation(IInstallableUnitFragment fragment) {
for (IProvidedCapability capability : fragment.getProvidedCapabilities()) {
// TODO make the constant in the TranslationSupport class public and use it
if ("org.eclipse.equinox.p2.localization".equals(capability.getNamespace())) //$NON-NLS-1$
return true;
}
return false;
}
}
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