Copyright (c) 2004, 2018 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) 2004, 2018 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;

import java.util.Map;
import org.eclipse.core.runtime.InvalidRegistryObjectException;

Since:
3.1/**
 * @since 3.1
 */
public class TemporaryObjectManager implements IObjectManager {
	private Map<?, ?> actualObjects; //id --> registry objects
	private final RegistryObjectManager parent; //the main object manager (should be equals to extensionRegistry.getObjectManager)

	public TemporaryObjectManager(Map<?, ?> actualObjects, RegistryObjectManager parent) {
		this.actualObjects = actualObjects;
		this.parent = parent;
	}

	@Override
	public Handle getHandle(int id, byte type) {
		switch (type) {
			case RegistryObjectManager.EXTENSION_POINT :
				return new ExtensionPointHandle(this, id);

			case RegistryObjectManager.EXTENSION :
				return new ExtensionHandle(this, id);

			case RegistryObjectManager.CONFIGURATION_ELEMENT :
				return new ConfigurationElementHandle(this, id);

			case RegistryObjectManager.THIRDLEVEL_CONFIGURATION_ELEMENT :
			default : //avoid compiler error, type should always be known
				return new ThirdLevelConfigurationElementHandle(this, id);
		}
	}

	@Override
	public Handle[] getHandles(int[] ids, byte type) {
		Handle[] results = null;
		int nbrId = ids.length;
		switch (type) {
			case RegistryObjectManager.EXTENSION_POINT :
				if (nbrId == 0)
					return ExtensionPointHandle.EMPTY_ARRAY;
				results = new ExtensionPointHandle[nbrId];
				for (int i = 0; i < nbrId; i++) {
					results[i] = new ExtensionPointHandle(this, ids[i]);
				}
				break;

			case RegistryObjectManager.EXTENSION :
				if (nbrId == 0)
					return ExtensionHandle.EMPTY_ARRAY;
				results = new ExtensionHandle[nbrId];
				for (int i = 0; i < nbrId; i++) {
					results[i] = new ExtensionHandle(this, ids[i]);
				}
				break;

			case RegistryObjectManager.CONFIGURATION_ELEMENT :
				if (nbrId == 0)
					return ConfigurationElementHandle.EMPTY_ARRAY;
				results = new ConfigurationElementHandle[nbrId];
				for (int i = 0; i < nbrId; i++) {
					results[i] = new ConfigurationElementHandle(this, ids[i]);
				}
				break;

			case RegistryObjectManager.THIRDLEVEL_CONFIGURATION_ELEMENT :
				if (nbrId == 0)
					return ConfigurationElementHandle.EMPTY_ARRAY;
				results = new ThirdLevelConfigurationElementHandle[nbrId];
				for (int i = 0; i < nbrId; i++) {
					results[i] = new ThirdLevelConfigurationElementHandle(this, ids[i]);
				}
				break;
		}
		return results;
	}

	@Override
	synchronized public Object getObject(int id, byte type) {
		Object result = null;
		try {
			result = parent.getObject(id, type);
		} catch (InvalidRegistryObjectException e) {
			if (actualObjects != null) {
				result = actualObjects.get(Integer.valueOf(id));
			}
		}
		if (result == null)
			throw new InvalidRegistryObjectException();
		return result;
	}

	@Override
	synchronized public RegistryObject[] getObjects(int[] values, byte type) {
		if (values.length == 0) {
			switch (type) {
				case RegistryObjectManager.EXTENSION_POINT :
					return ExtensionPoint.EMPTY_ARRAY;
				case RegistryObjectManager.EXTENSION :
					return Extension.EMPTY_ARRAY;
				case RegistryObjectManager.CONFIGURATION_ELEMENT :
				case RegistryObjectManager.THIRDLEVEL_CONFIGURATION_ELEMENT :
					return ConfigurationElement.EMPTY_ARRAY;
			}
		}

		RegistryObject[] results = null;
		switch (type) {
			case RegistryObjectManager.EXTENSION_POINT :
				results = new ExtensionPoint[values.length];
				break;
			case RegistryObjectManager.EXTENSION :
				results = new Extension[values.length];
				break;
			case RegistryObjectManager.CONFIGURATION_ELEMENT :
			case RegistryObjectManager.THIRDLEVEL_CONFIGURATION_ELEMENT :
				results = new ConfigurationElement[values.length];
				break;
		}
		for (int i = 0; i < values.length; i++) {
			results[i] = (RegistryObject) getObject(values[i], type);
		}
		return results;
	}

	@Override
	public synchronized void close() {
		actualObjects = null;
	}
}