/*******************************************************************************
 * Copyright (c) 2000, 2015 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.ui.internal;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.registry.IWorkbenchRegistryConstants;
import org.eclipse.ui.internal.registry.RegistryReader;

/**
 * This reader loads the popup menu manager with all the popup menu contributors
 * found in the workbench registry.
 */
public class ObjectActionContributorReader extends RegistryReader {

	private ObjectActionContributorManager manager;

	/**
	 * Creates popup menu contributor from this element.
	 */
	protected void processObjectContribution(IConfigurationElement element) {
		String objectClassName = element.getAttribute(IWorkbenchRegistryConstants.ATT_OBJECTCLASS);
		if (objectClassName == null) {
			logMissingAttribute(element, IWorkbenchRegistryConstants.ATT_OBJECTCLASS);
			return;
		}

		IObjectContributor contributor = new ObjectActionContributor(element);
		manager.registerContributor(contributor, objectClassName);
	}

	/**
	 * Implements abstract method to handle configuration elements.
	 */
	@Override
	protected boolean readElement(IConfigurationElement element) {
		String tagName = element.getName();
		if (tagName.equals(IWorkbenchRegistryConstants.TAG_OBJECT_CONTRIBUTION)) {
			processObjectContribution(element);
			return true;
		}
		if (tagName.equals(IWorkbenchRegistryConstants.TAG_VIEWER_CONTRIBUTION)) {
			return true;
		}

		return false;
	}

	/**
	 * Reads the registry and registers popup menu contributors found there.
	 *
	 * @param mng the manager to read into
	 */
	public void readPopupContributors(ObjectActionContributorManager mng) {
		setManager(mng);
		IExtensionRegistry registry = Platform.getExtensionRegistry();
		readRegistry(registry, PlatformUI.PLUGIN_ID, IWorkbenchRegistryConstants.PL_POPUP_MENU);
	}

	/**
	 * Set the manager to read into.
	 *
	 * @param mng the manager
	 */
	public void setManager(ObjectActionContributorManager mng) {
		manager = mng;
	}
}
