Copyright (c) 2006 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.core.internal.registry;

public class RegistryIndexElement implements KeyedElement {

	// The key on which indexing is done
	final protected String key;

	// Extension points matching the key
	private RegistryIndexChildren extensionPoints;

	// Extensions matching the key
	private RegistryIndexChildren extensions;

	public RegistryIndexElement(String key) {
		this.key = key;
	}

	public RegistryIndexElement(String key, int[] extensionPoints, int[] extensions) {
		this.key = key;
		this.extensionPoints = new RegistryIndexChildren(extensionPoints);
		this.extensions = new RegistryIndexChildren(extensions);
	}

	protected int[] getExtensions() {
		if (extensions == null)
			return RegistryIndexChildren.EMPTY_ARRAY;
		return extensions.getChildren();
	}

	protected int[] getExtensionPoints() {
		if (extensionPoints == null)
			return RegistryIndexChildren.EMPTY_ARRAY;
		return extensionPoints.getChildren();
	}

	public boolean updateExtension(int id, boolean add) {
		if (extensions == null)
			extensions = new RegistryIndexChildren();

		if (add)
			return extensions.linkChild(id);
		return extensions.unlinkChild(id);
	}

	public boolean updateExtensions(int[] IDs, boolean add) {
		if (extensions == null)
			extensions = new RegistryIndexChildren();

		if (add)
			return extensions.linkChildren(IDs);
		return extensions.unlinkChildren(IDs);
	}

	public boolean updateExtensionPoint(int id, boolean add) {
		if (extensionPoints == null)
			extensionPoints = new RegistryIndexChildren();

		if (add)
			return extensionPoints.linkChild(id);
		return extensionPoints.unlinkChild(id);
	}

	public boolean updateExtensionPoints(int[] IDs, boolean add) {
		if (extensionPoints == null)
			extensionPoints = new RegistryIndexChildren();

		if (add)
			return extensionPoints.linkChildren(IDs);
		return extensionPoints.unlinkChildren(IDs);
	}

	//Implements the KeyedElement interface
	@Override
	public int getKeyHashCode() {
		return getKey().hashCode();
	}

	@Override
	public Object getKey() {
		return key;
	}

	@Override
	public boolean compare(KeyedElement other) {
		return key.equals(((RegistryIndexElement) other).key);
	}
}