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/*******************************************************************************
* Copyright (c) 2009 Cloudsmith Inc. 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:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.ql;
import java.util.*;
import org.eclipse.equinox.internal.p2.core.helpers.CollectionUtils;
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.metadata.IRequirement;
import org.eclipse.equinox.p2.ql.ICapabilityIndex;
/**
* An in-memory implementation of a CapabilityIndex based on a Map.
*/
public class CapabilityIndex implements ICapabilityIndex {
private final Map<String, Object> capabilityMap;
private static class IUCapability {
final IInstallableUnit iu;
final IProvidedCapability capability;
IUCapability(IInstallableUnit iu, IProvidedCapability capability) {
this.iu = iu;
this.capability = capability;
}
}
public CapabilityIndex(Iterator<IInstallableUnit> itor) {
HashMap<String, Object> index = new HashMap<String, Object>();
while (itor.hasNext()) {
IInstallableUnit iu = itor.next();
List<IProvidedCapability> pcs = iu.getProvidedCapabilities();
int idx = pcs.size();
while (--idx >= 0) {
IProvidedCapability pc = pcs.get(idx);
IUCapability iuCap = new IUCapability(iu, pc);
String name = pc.getName();
Object prev = index.put(name, iuCap);
if (prev != null) {
ArrayList<IUCapability> lst;
if (prev instanceof ArrayList<?>)
lst = (ArrayList<IUCapability>) prev;
else {
lst = new ArrayList<IUCapability>(4);
lst.add((IUCapability) prev);
}
lst.add(iuCap);
index.put(name, lst);
}
}
}
this.capabilityMap = index;
}
public Iterator<IInstallableUnit> satisfiesAny(Iterator<IRequirement> requirements) {
if (!requirements.hasNext())
return CollectionUtils.<IInstallableUnit> emptyList().iterator();
List<IInstallableUnit> collector = new ArrayList<IInstallableUnit>();
do {
IRequirement nxt = requirements.next();
collectMatchingIUs((IRequiredCapability) nxt, collector);
} while (requirements.hasNext());
return collector.iterator();
}
public Iterator<IInstallableUnit> satisfiesAll(Iterator<IRequirement> requirements) {
if (!requirements.hasNext())
return CollectionUtils.<IInstallableUnit> emptyList().iterator();
Set<IInstallableUnit> collector = new HashSet<IInstallableUnit>();
collectMatchingIUs(requirements.next(), collector);
while (requirements.hasNext() && !collector.isEmpty())
collector = retainMatchingIUs(requirements.next(), collector);
return collector.iterator();
}
private void collectMatchingIUs(IRequirement requirement, Collection<IInstallableUnit> collector) {
if (!(requirement instanceof IRequiredCapability))
return;
IRequiredCapability rc = (IRequiredCapability) requirement;
Object v = capabilityMap.get(rc.getName());
if (v == null)
return;
if (v instanceof IUCapability) {
IUCapability iuc = (IUCapability) v;
if (iuc.capability.satisfies(requirement))
collector.add(iuc.iu);
} else {
List<IUCapability> iucs = (List<IUCapability>) v;
int idx = iucs.size();
while (--idx >= 0) {
IUCapability iuc = iucs.get(idx);
if (iuc.capability.satisfies(requirement))
collector.add(iuc.iu);
}
}
}
private Set<IInstallableUnit> retainMatchingIUs(IRequirement requirement, Set<IInstallableUnit> collector) {
if (!(requirement instanceof IRequiredCapability))
return CollectionUtils.emptySet();
IRequiredCapability rc = (IRequiredCapability) requirement;
Object v = capabilityMap.get(rc.getName());
if (v == null)
return CollectionUtils.emptySet();
Set<IInstallableUnit> retained = null;
if (v instanceof IUCapability) {
IUCapability iuc = (IUCapability) v;
if (iuc.capability.satisfies(requirement) && collector.contains(iuc.iu)) {
if (retained == null)
retained = new HashSet<IInstallableUnit>();
retained.add(iuc.iu);
}
} else {
List<IUCapability> iucs = (List<IUCapability>) v;
int idx = iucs.size();
while (--idx >= 0) {
IUCapability iuc = iucs.get(idx);
if (iuc.capability.satisfies(requirement) && collector.contains(iuc.iu)) {
if (retained == null)
retained = new HashSet<IInstallableUnit>();
retained.add(iuc.iu);
}
}
}
return retained == null ? CollectionUtils.<IInstallableUnit> emptySet() : retained;
}
}
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