package net.sourceforge.phpdt.externaltools.variable;

/**********************************************************************
Copyright (c) 2002 IBM Corp. and others. All rights reserved.
This file is made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html
 
Contributors:
**********************************************************************/

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Label;
import net.sourceforge.phpdt.externaltools.internal.model.ToolMessages;

/**
 * Visual component to edit the resource type variable
 * value for the working directory. Variable is limited to a specific
 * <code>IContainer</code> resource.
 * <p>
 * This class is not intended to be extended by clients.
 * </p>
 */
public class SpecificFolderResourceComponent extends ResourceComponent {

	/**
	 * Creates an instance
	 */
	public SpecificFolderResourceComponent() {
		super();
	}

	/* (non-Javadoc)
	 * Method declared on ResourceComponent.
	 */
	protected void createSelectedResourceOption() {
		// Do not present this option...
	}
	
	/* (non-Javadoc)
	 * Method declared on ResourceComponent.
	 */
	protected void createResourceList() {
		super.createResourceList();
		if (resourceList != null)
			resourceList.addFilter(new FileFilter());
	}

	/* (non-Javadoc)
	 * Method declared on ResourceComponent.
	 */
	protected void createSpecificResourceOption() {
		Label label = new Label(mainGroup, SWT.NONE);
		GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		label.setLayoutData(data);
		label.setFont(mainGroup.getFont());
		label.setText(ToolMessages.getString("ResourceComponent.specificResLabel")); //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * Method declared on ResourceComponent.
	 */
	protected boolean validateResourceListSelection() {
		if (resourceList == null)
			return true;
			
		IStructuredSelection sel = (IStructuredSelection) resourceList.getSelection();
		IResource resource = (IResource) sel.getFirstElement();
		if (resource == null || resource.getType() == IResource.FILE) {
			getPage().setMessage(ToolMessages.getString("ResourceComponent.selectionRequired"), IMessageProvider.WARNING); //$NON-NLS-1$
			setIsValid(false);
			return false;
		}
		
		return true;
	}
	
	
	/**
	 * Filter to remove any IFile resources.
	 */
	private static final class FileFilter extends ViewerFilter {
		/* (non-Javadoc)
		 * Method declared on ViewerFilter.
		 */
		public boolean select(Viewer viewer, Object parentElement, Object element) {
			IResource resource = null;
			if (element instanceof IResource) {
				resource = (IResource) element;
			} else {
				if (element instanceof IAdaptable) {
					IAdaptable adaptable = (IAdaptable) element;
					resource = (IResource) adaptable.getAdapter(IResource.class);
				}
			}
			
			if (resource != null)
				return resource.getType() != IResource.FILE;
			else
				return false;
		}
	}
}