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/*******************************************************************************
* Copyright (c) 2007, 2009 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 org.eclipse.equinox.p2.metadata.IInstallableUnitFragment;
import java.util.*;
import org.eclipse.equinox.internal.provisional.p2.metadata.MetadataFactory;
import org.eclipse.equinox.internal.provisional.p2.metadata.MetadataFactory.InstallableUnitDescription;
import org.eclipse.equinox.p2.engine.InstallableUnitOperand;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.metadata.query.InstallableUnitQuery;
public class OperationGenerator {
private static final IInstallableUnit NULL_IU = MetadataFactory.createResolvedInstallableUnit(MetadataFactory.createInstallableUnit(new InstallableUnitDescription()), new IInstallableUnitFragment[0]);
public List<InstallableUnitOperand> generateOperation(Collection<IInstallableUnit> from_, Collection<IInstallableUnit> to_) {
Collection<IInstallableUnit> intersection = new HashSet<IInstallableUnit>(from_);
intersection.retainAll(to_);
HashSet<IInstallableUnit> tmpFrom = new HashSet<IInstallableUnit>(from_);
HashSet<IInstallableUnit> tmpTo = new HashSet<IInstallableUnit>(to_);
tmpFrom.removeAll(intersection);
tmpTo.removeAll(intersection);
List<IInstallableUnit> from = new ArrayList<IInstallableUnit>(tmpFrom);
Collections.sort(from);
List<IInstallableUnit> to = new ArrayList<IInstallableUnit>(tmpTo);
Collections.sort(to);
ArrayList<InstallableUnitOperand> operations = new ArrayList<InstallableUnitOperand>();
generateUpdates(from, to, operations);
generateInstallUninstall(from, to, operations);
generateConfigurationChanges(to_, intersection, operations);
return operations;
}
//This generates operations that are causing the IUs to be reconfigured.
private void generateConfigurationChanges(Collection<IInstallableUnit> to_, Collection<IInstallableUnit> intersection, ArrayList<InstallableUnitOperand> operations) {
if (intersection.size() == 0)
return;
//We retain from each set the things that are the same.
//Note that despite the fact that they are the same, a different CU can be attached.
//The objects contained in the intersection are the one that were originally in the from collection.
TreeSet<IInstallableUnit> to = new TreeSet<IInstallableUnit>(to_);
for (IInstallableUnit fromIU : intersection) {
IInstallableUnit toIU = to.tailSet(fromIU).first();
generateConfigurationOperation(fromIU, toIU, operations);
}
}
private void generateConfigurationOperation(IInstallableUnit fromIU, IInstallableUnit toIU, ArrayList<InstallableUnitOperand> operations) {
List<IInstallableUnitFragment> fromFragments = fromIU.getFragments();
List<IInstallableUnitFragment> toFragments = toIU.getFragments();
if (fromFragments == toFragments)
return;
//Check to see if the two arrays are equals independently of the order of the fragments
if (fromFragments.size() == toFragments.size() && fromFragments.containsAll(toFragments))
return;
operations.add(new InstallableUnitOperand(fromIU, toIU));
}
private void generateInstallUninstall(List<IInstallableUnit> from, List<IInstallableUnit> to, ArrayList<InstallableUnitOperand> operations) {
int toIdx = 0;
int fromIdx = 0;
while (fromIdx != from.size() && toIdx != to.size()) {
IInstallableUnit fromIU = from.get(fromIdx);
IInstallableUnit toIU = to.get(toIdx);
int comparison = toIU.compareTo(fromIU);
if (comparison < 0) {
operations.add(createInstallOperation(toIU));
toIdx++;
} else if (comparison == 0) {
toIdx++;
fromIdx++;
// System.out.println("same " + fromIU);
} else {
operations.add(createUninstallOperation(fromIU));
fromIdx++;
}
}
if (fromIdx != from.size()) {
for (int i = fromIdx; i < from.size(); i++) {
operations.add(createUninstallOperation(from.get(i)));
}
}
if (toIdx != to.size()) {
for (int i = toIdx; i < to.size(); i++) {
operations.add(createInstallOperation(to.get(i)));
}
}
}
private void generateUpdates(List<IInstallableUnit> from, List<IInstallableUnit> to, ArrayList<InstallableUnitOperand> operations) {
if (to.isEmpty() || from.isEmpty())
return;
Set<IInstallableUnit> processed = new HashSet<IInstallableUnit>();
Set<IInstallableUnit> removedFromTo = new HashSet<IInstallableUnit>();
Map<String, List<IInstallableUnit>> fromById = new HashMap<String, List<IInstallableUnit>>();
for (IInstallableUnit iuFrom : from) {
List<IInstallableUnit> ius = fromById.get(iuFrom.getId());
if (ius == null) {
ius = new ArrayList<IInstallableUnit>();
fromById.put(iuFrom.getId(), ius);
}
ius.add(iuFrom);
}
for (int toIdx = 0; toIdx < to.size(); toIdx++) {
IInstallableUnit iuTo = to.get(toIdx);
if (iuTo.getId().equals(next(to, toIdx).getId())) { //This handle the case where there are multiple versions of the same IU in the target. Eg we are trying to update from A 1.0.0 to A 1.1.1 and A 1.2.2
toIdx = skip(to, iuTo, toIdx) - 1;
//System.out.println("Can't update " + iuTo + " because another iu with same id is in the target state");
continue;
}
if (iuTo.getUpdateDescriptor() == null)
continue;
List<IInstallableUnit> fromIdIndexList = fromById.get(iuTo.getUpdateDescriptor().getId());
if (fromIdIndexList == null)
continue;
//when the ui we update from is in the new state, skip (for example FROM is A, C, B & TO is C (update of
InstallableUnitQuery updateQuery = new InstallableUnitQuery(iuTo.getUpdateDescriptor().getId(), iuTo.getUpdateDescriptor().getRange());
Iterator<IInstallableUnit> updates = updateQuery.perform(fromIdIndexList.iterator()).iterator();
if (!updates.hasNext()) { //Nothing to update from.
continue;
}
IInstallableUnit iuFrom = updates.next();
if (updates.hasNext()) { //There are multiple IUs to update from
//System.out.println("Can't update " + iuTo + " because there are multiple IUs to update from (" + toString(iusFrom) + ')');
continue;
}
if (iuTo.equals(iuFrom)) {
from.remove(iuFrom);
fromIdIndexList.remove(iuFrom);
removedFromTo.add(iuTo);
continue;
}
operations.add(createUpdateOperation(iuFrom, iuTo));
from.remove(iuFrom);
fromIdIndexList.remove(iuFrom);
processed.add(iuTo);
}
to.removeAll(processed);
to.removeAll(removedFromTo);
}
private InstallableUnitOperand createUninstallOperation(IInstallableUnit iu) {
return new InstallableUnitOperand(iu, null);
}
private InstallableUnitOperand createInstallOperation(IInstallableUnit iu) {
return new InstallableUnitOperand(null, iu);
}
private InstallableUnitOperand createUpdateOperation(IInstallableUnit from, IInstallableUnit to) {
return new InstallableUnitOperand(from, to);
}
private IInstallableUnit next(List<IInstallableUnit> l, int i) {
i++;
if (i >= l.size())
return NULL_IU;
return l.get(i);
}
private int skip(List<IInstallableUnit> c, IInstallableUnit id, int idx) {
int i = idx;
for (; i < c.size(); i++) {
if (!id.getId().equals(c.get(i).getId()))
return i;
}
return i;
}
}
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