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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
* IBM Corporation - ongoing development
******************************************************************************/
package org.eclipse.equinox.internal.p2.ui;
import java.util.*;
import org.eclipse.equinox.internal.p2.core.helpers.CollectionUtils;
import org.eclipse.equinox.internal.provisional.p2.metadata.query.Collector;
/**
* Wraps query results inside corresponding UI elements
*/
public abstract class ElementWrapper {
private Collection<Object> collection = null;
/**
* Transforms a collector returned by a query to a collection
* of UI elements
*/
public Collection<?> getElements(Collector<?> collector) {
collection = new ArrayList<Object>(collector.size());
Iterator<?> iter = collector.iterator();
while (iter.hasNext()) {
Object o = iter.next();
if (shouldWrap(o))
collection.add(wrap(o));
}
return getCollection();
}
/**
* Gets the collection where the elements are being stored.
*/
protected Collection<?> getCollection() {
return collection == null ? CollectionUtils.emptyList() : collection;
}
/**
* Determines if this object should be accepted and wrapped
* by a UI element.
*/
protected boolean shouldWrap(Object o) {
return true;
}
/**
* Wraps a single element of the query result inside a UI element.
*/
protected abstract Object wrap(Object item);
}
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