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/*******************************************************************************
 * Copyright (c) 2010, 2018 Mat Booth 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
 *******************************************************************************/
package org.eclipse.dltk.sh.internal.ui.commands;

import java.util.Iterator;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * An abstract command handler that iterates through the current selection
 * looking for projects resources to save us from having this code in every
 * handler that wants to manipulate projects.
 */
public abstract class AbstractProjectHandler extends AbstractHandler {

	@Override
	public Object execute(ExecutionEvent event) {
		IStructuredSelection selection = HandlerUtil.getCurrentStructuredSelection(event);
		Iterator<?> iterator = selection.iterator();
		while (iterator.hasNext()) {
			Object element = iterator.next();
			IProject project = null;
			if (element instanceof IProject) {
				project = (IProject) element;
			} else if (element instanceof IAdaptable) {
				project = ((IAdaptable) element).getAdapter(IProject.class);
			}
			if (project != null) {
				fettleProject(project);
			}
		}
		return null;
	}

	/**
	 * To be implemented by sub-classes to perform actions on a project. This will
	 * be called once for every project resource that is currently selected.
	 *
	 * @param project a project resource for manipulation
	 */
	protected abstract void fettleProject(IProject project);
}