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/*******************************************************************************
* Copyright (c) 2009 EclipseSource 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:
* EclipseSource - initial API and implementation
******************************************************************************/
package org.eclipse.equinox.internal.provisional.p2.metadata.query;
import java.lang.reflect.Array;
import java.util.*;
import org.eclipse.core.runtime.*;
import org.eclipse.equinox.p2.metadata.query.IQuery;
/**
* A queryable that holds a number of other IQueryables and provides
* a mechanism for querying the entire set.
*/
public class CompoundQueryable implements IQueryable {
private IQueryable[] queryables;
public CompoundQueryable(IQueryable[] queryables) {
this.queryables = queryables;
}
public Collector query(IQuery query, IProgressMonitor monitor) {
Collector results = new Collector();
Collector subResults = null;
if (monitor == null) {
monitor = new NullProgressMonitor();
}
boolean isMatchQuery = query instanceof IMatchQuery;
int totalWork = isMatchQuery ? queryables.length : queryables.length + 1;
try {
SubMonitor subMonitor = SubMonitor.convert(monitor, totalWork * 10);
if (!isMatchQuery) {
// If it is not a match query, then collect the results
// as a list, we will query this list for the final results
results = new ListCollector();
}
for (int i = 0; i < queryables.length; i++) {
if (subMonitor.isCanceled())
break;
subResults = queryables[i].query(query, subMonitor.newChild(10));
results.addAll(subResults);
}
if (!isMatchQuery) {
// If it is not a MatchQuery then we must query the results.
results = results.query(query, subMonitor.newChild(10));
} else
results = results;
} finally {
monitor.done();
}
return results;
}
/**
* A list collector.
*
* This is a collector backed as a list.
*
* The list collector is not intended to be used outside of this class. It is only public
* for testing purposes.
*
* @noinstantiate This class is not intended to be instantiated by clients.
* @noextend This class is not intended to be subclassed by clients.
*
*/
public class ListCollector extends Collector {
private List collected;
public ListCollector() {
super();
}
protected Collection getCollection() {
if (collected == null)
collected = new ArrayList();
return collected;
}
public boolean isEmpty() {
return collected == null || collected.isEmpty();
}
public Object[] toArray(Class clazz) {
int size = collected == null ? 0 : collected.size();
Object[] result = (Object[]) Array.newInstance(clazz, size);
if (size != 0)
collected.toArray(result);
return result;
}
public boolean accept(Object object) {
if (collected == null)
collected = new ArrayList();
collected.add(object);
return true;
}
/**
* Returns the collected objects as an immutable collection.
*
* @return An unmodifiable collection of the collected objects
*/
public Collection toCollection() {
return collected == null ? Collections.EMPTY_LIST : Collections.unmodifiableList(collected);
}
public Iterator iterator() {
return collected == null ? Collections.EMPTY_LIST.iterator() : collected.iterator();
}
public int size() {
return collected == null ? 0 : collected.size();
}
}
}
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