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/*******************************************************************************
* Copyright (c) 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.metadata.repository;
import java.util.*;
import org.eclipse.equinox.internal.provisional.p2.metadata.query.Collector;
import org.eclipse.equinox.internal.provisional.p2.metadata.query.InstallableUnitQuery;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
/**
* A map that stores {@link IInstallableUnit} instances in a way that is efficient to query
*/
public class IUMap {
/**
* Iterator over all the {@link IInstallableUnit} instances in the map.
*/
public class MapIterator implements Iterator {
//iterator over the keys in UIMap
private Iterator unitIterator;
//iterator over the Set inside a single value of the IUMap
private Iterator currentBucket;
MapIterator() {
super();
unitIterator = units.keySet().iterator();
}
public boolean hasNext() {
return unitIterator.hasNext() || (currentBucket != null && currentBucket.hasNext());
}
public Object next() {
if (currentBucket == null || !currentBucket.hasNext())
currentBucket = ((Set) units.get(unitIterator.next())).iterator();
return currentBucket.next();
}
public void remove() {
throw new UnsupportedOperationException();
}
}
/**
* Map<String,Set<IInstallableUnit>> mapping IU id to iu's with that id.
*/
final Map units = new HashMap();
public void add(IInstallableUnit unit) {
Set matching = (Set) units.get(unit.getId());
if (matching == null) {
matching = new HashSet(2);
units.put(unit.getId(), matching);
}
matching.add(unit);
}
public void addAll(IInstallableUnit[] toAdd) {
for (int i = 0; i < toAdd.length; i++)
add(toAdd[i]);
}
public void clear() {
units.clear();
}
public Iterator iterator() {
return new MapIterator();
}
public Collector query(InstallableUnitQuery query) {
//iterate over the entire map, or just the IU's with the given id
Collector result = new Collector();
Iterator candidates;
if (query.getId() == null)
candidates = iterator();
else {
Collection bucket = ((Collection) units.get(query.getId()));
if (bucket == null)
return result;
candidates = bucket.iterator();
}
return query.perform(candidates, result);
}
public void remove(IInstallableUnit unit) {
Set matching = (Set) units.get(unit.getId());
if (matching == null)
return;
matching.remove(unit);
if (matching.isEmpty())
units.remove(unit.getId());
}
public void removeAll(Collection toRemove) {
for (Iterator it = toRemove.iterator(); it.hasNext();)
remove((IInstallableUnit) it.next());
}
}
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