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/*******************************************************************************
* Copyright (c) 2008 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.core.runtime.IProgressMonitor;
import org.eclipse.equinox.internal.p2.metadata.IRequiredCapability;
import org.eclipse.equinox.internal.provisional.p2.metadata.IProvidedCapability;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.query.*;
public class QueryableArray implements IQueryable<IInstallableUnit> {
static class IUCapability {
final IInstallableUnit iu;
final IProvidedCapability capability;
public IUCapability(IInstallableUnit iu, IProvidedCapability capability) {
this.iu = iu;
this.capability = capability;
}
}
private final List<IInstallableUnit> dataSet;
private Map<String, List<IUCapability>> namedCapabilityIndex;
public QueryableArray(IInstallableUnit[] ius) {
dataSet = Arrays.asList(ius);
}
public IQueryResult<IInstallableUnit> query(IQuery<IInstallableUnit> query, IProgressMonitor monitor) {
if (query instanceof IRequiredCapability)
return queryCapability((IRequiredCapability) query, new Collector<IInstallableUnit>(), monitor);
return query.perform(dataSet.iterator());
}
private Collector<IInstallableUnit> queryCapability(IRequiredCapability query, Collector<IInstallableUnit> collector, IProgressMonitor monitor) {
generateNamedCapabilityIndex();
Collection<IInstallableUnit> resultIUs = null;
Collection<IInstallableUnit> matchingIUs = findMatchingIUs(query);
if (matchingIUs == null)
return collector;
if (resultIUs == null)
resultIUs = matchingIUs;
else
resultIUs.retainAll(matchingIUs);
if (resultIUs != null)
for (Iterator<IInstallableUnit> iterator = resultIUs.iterator(); iterator.hasNext();)
collector.accept(iterator.next());
return collector;
}
private Collection<IInstallableUnit> findMatchingIUs(IRequiredCapability requiredCapability) {
List<IUCapability> iuCapabilities = namedCapabilityIndex.get(requiredCapability.getName());
if (iuCapabilities == null)
return null;
Set<IInstallableUnit> matchingIUs = new HashSet<IInstallableUnit>();
for (IUCapability iuCapability : iuCapabilities) {
if (iuCapability.iu.satisfies(requiredCapability))
matchingIUs.add(iuCapability.iu);
}
return matchingIUs;
}
private void generateNamedCapabilityIndex() {
if (namedCapabilityIndex != null)
return;
namedCapabilityIndex = new HashMap<String, List<IUCapability>>();
for (IInstallableUnit iu : dataSet) {
Collection<IProvidedCapability> providedCapabilities = iu.getProvidedCapabilities();
for (IProvidedCapability pc : providedCapabilities) {
String name = pc.getName();
List<IUCapability> iuCapabilities = namedCapabilityIndex.get(name);
if (iuCapabilities == null) {
iuCapabilities = new ArrayList<IUCapability>(5);
namedCapabilityIndex.put(name, iuCapabilities);
}
iuCapabilities.add(new IUCapability(iu, pc));
}
}
}
}
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