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/*******************************************************************************
* Copyright (c) 2007, 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
* EclipseSource - ongoing development
*******************************************************************************/
package org.eclipse.equinox.internal.p2.ui.query;
import java.util.*;
import org.eclipse.equinox.internal.p2.metadata.IRequiredCapability;
import org.eclipse.equinox.internal.p2.ui.model.CategoryElement;
import org.eclipse.equinox.internal.p2.ui.model.QueriedElementWrapper;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.metadata.IRequirement;
import org.eclipse.equinox.p2.query.Collector;
import org.eclipse.equinox.p2.query.IQueryable;
/**
* A collector that converts IU's to category elements as it accepts them.
* It can be configured so that it is never empty.
*
* @since 3.4
*/
public class CategoryElementWrapper extends QueriedElementWrapper {
// Used to track nested categories
private Set<String> referredIUs = new HashSet<String>();
public CategoryElementWrapper(IQueryable<?> queryable, Object parent) {
super(queryable, parent);
}
protected boolean shouldWrap(Object match) {
if (match instanceof IInstallableUnit) {
IInstallableUnit iu = (IInstallableUnit) match;
Collection<IRequirement> requirements = iu.getRequiredCapabilities();
for (IRequirement requirement : requirements) {
if (requirement instanceof IRequiredCapability) {
if (((IRequiredCapability) requirement).getNamespace().equals(IInstallableUnit.NAMESPACE_IU_ID)) {
referredIUs.add(((IRequiredCapability) requirement).getName());
}
}
}
Iterator<?> iter = super.getCollection().iterator();
// Don't add the same category IU twice.
while (iter.hasNext()) {
CategoryElement element = (CategoryElement) iter.next();
if (element.shouldMerge(iu)) {
element.mergeIU(iu);
return false;
}
}
return true;
}
return false;
}
public Collection<?> getElements(Collector<?> collector) {
if (collector.isEmpty())
return super.getElements(collector);
Collection<?> results = super.getElements(collector);
cleanList();
return results;
}
protected Object wrap(Object item) {
IInstallableUnit iu = (IInstallableUnit) item;
return super.wrap(new CategoryElement(parent, iu));
}
private void cleanList() {
removeNestedCategories();
}
private void removeNestedCategories() {
CategoryElement[] categoryIUs = getCollection().toArray(new CategoryElement[getCollection().size()]);
// If any other element refers to a category element, remove it from the list
for (int i = 0; i < categoryIUs.length; i++) {
if (referredIUs.contains(categoryIUs[i].getIU().getId())) {
getCollection().remove(categoryIUs[i]);
}
}
}
}
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