Content of file CreateChildAction.java

/**
 * Copyright (c) 2002-2007 IBM Corporation and others.
 *
 * All rights reserved. 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 - Initial API and implementation
 */
// REUSED CLASS
package org.eclipse.emf.edit.ui.action.ecp;

import java.util.Collection;

import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.edit.command.CreateChildCommand;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.jface.viewers.ISelection;

/**
 * A child creation action is implemented by creating a {@link CreateChildCommand}.
 */
public class CreateChildAction extends StaticSelectionCommandAction {
	/**
	 * This describes the child to be created.
	 */
	protected Object descriptor;

	/**
	 * This constructs an instance of an action that uses the given editing domain to create a child
	 * specified by <code>descriptor</code> for the single object in the <code>selection</code>.
	 *
	 * @since 2.4.0
	 */
	public CreateChildAction(EditingDomain editingDomain, ISelection selection, Object descriptor) {
		super(editingDomain);
		this.descriptor = descriptor;
		configureAction(selection);
	}

	/**
	 * This creates the command for {@link StaticSelectionCommandAction#createActionCommand}.
	 */
	@Override
	protected Command createActionCommand(EditingDomain editingDomain, Collection<?> collection) {
		if (collection.size() == 1) {
			final Object owner = collection.iterator().next();
			return CreateChildCommand.create(editingDomain, owner,
				descriptor, collection);
		}
		return UnexecutableCommand.INSTANCE;
	}
}