/*******************************************************************************
 * Copyright (c) 2007, 2008 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.ui.model;

import java.util.*;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.equinox.internal.provisional.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.internal.provisional.p2.metadata.IRequiredCapability;
import org.eclipse.equinox.internal.provisional.p2.ui.ProvUIImages;
import org.eclipse.equinox.internal.provisional.p2.ui.policy.QueryProvider;

/**
 * Element wrapper class for IU's that represent categories of
 * available IU's
 * 
 * @since 3.4
 */
public class CategoryElement extends RemoteQueriedElement implements IIUElement {

	private ArrayList ius = new ArrayList(1);
	private IRequiredCapability[] requirements;

	public CategoryElement(Object parent, IInstallableUnit iu) {
		super(parent);
		ius.add(iu);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.equinox.internal.provisional.p2.ui.model.ProvElement#getImageID(java.lang.Object)
	 */
	protected String getImageId(Object obj) {
		return ProvUIImages.IMG_CATEGORY;
	}

	public String getLabel(Object o) {
		IInstallableUnit iu = getIU();
		if (iu != null)
			return iu.getId();
		return null;
	}

	public Object getAdapter(Class adapter) {
		if (adapter == IInstallableUnit.class)
			return getIU();
		return super.getAdapter(adapter);
	}

	protected int getDefaultQueryType() {
		return QueryProvider.AVAILABLE_IUS;
	}

	public IInstallableUnit getIU() {
		if (ius == null || ius.isEmpty())
			return null;
		return (IInstallableUnit) ius.get(0);
	}

	public long getSize() {
		return SIZE_UNKNOWN;
	}

	public boolean shouldShowSize() {
		return false;
	}

	public void computeSize(IProgressMonitor monitor) {
		// Should never be called, since shouldShowSize() returns false
	}

	public boolean shouldShowVersion() {
		return false;
	}

	public void mergeIU(IInstallableUnit iu) {
		ius.add(iu);
	}

	public IRequiredCapability[] getRequirements() {
		if (ius == null || ius.isEmpty())
			return new IRequiredCapability[0];
		if (requirements == null) {
			if (ius.size() == 1)
				requirements = getIU().getRequiredCapabilities();
			else {
				ArrayList capabilities = new ArrayList();
				Iterator iter = ius.iterator();
				while (iter.hasNext()) {
					IInstallableUnit iu = (IInstallableUnit) iter.next();
					capabilities.addAll(Arrays.asList(iu.getRequiredCapabilities()));
				}
				requirements = (IRequiredCapability[]) capabilities.toArray(new IRequiredCapability[capabilities.size()]);
			}
		}
		return requirements;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.equinox.internal.p2.ui.model.IIUElement#shouldShowChildren()
	 */
	public boolean shouldShowChildren() {
		return true;
	}

}