GenerateConstantsHandler.java

/******************************************************************************
 * Copyright (c) 2013, Linagora
 *
 * 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
 *
 * Contributors:
 * 		Linagora - initial API and implementation
 *******************************************************************************/

package com.ebmwebsourcing.petals.studio.dev.properties.internal.commands;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

import com.ebmwebsourcing.petals.studio.dev.properties.AbstractModel;
import com.ebmwebsourcing.petals.studio.dev.properties.internal.AbstractModelValidator;
import com.ebmwebsourcing.petals.studio.dev.properties.internal.wizards.GenerateConstantsWizard;

/**
 * The default handler for the command to validate a properties model.
 * @author Vincent Zurczak - EBM WebSourcing
 */
public class GenerateConstantsHandler extends AbstractHandler {

	private IFile propertiesFile;
	private boolean initialized = false;


	/*
	 * (non-Javadoc)
	 * @see org.eclipse.core.commands.AbstractHandler
	 * #execute(org.eclipse.core.commands.ExecutionEvent)
	 */
	@Override
	public Object execute( ExecutionEvent event ) throws ExecutionException {

		if( ! this.initialized )
			setEnabled( null );

		IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
		AbstractModel model = AbstractModel.create( this.propertiesFile.getLocation().toFile());
		if( model == null
				|| ! AbstractModelValidator.validate( model )) {
			MessageDialog.openError(
					window.getShell(),
					"Model Error",
					"The model could not be loaded or contains errors." );

		} else {
			GenerateConstantsWizard wizard = new GenerateConstantsWizard();
			wizard.setProject( this.propertiesFile.getProject());
			wizard.setModel( model );
			wizard.setWorkbenchWindow( window );

			new WizardDialog( window.getShell(), wizard ).open();
		}

		return null;
	}


	/*
	 * (non-Javadoc)
	 * @see org.eclipse.core.commands.AbstractHandler
	 * #setEnabled(java.lang.Object)
	 */
	@Override
	public void setEnabled( Object evaluationContext ) {

		// Check the selection
		this.initialized = true;
		ISelection s = null;
		try {
			s = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getSelection();
		} catch( Exception e1 ) {
			// nothing
		}

		boolean fine = false;
		if( s instanceof IStructuredSelection
				&& ((IStructuredSelection) s).size() == 1 ) {

			Object o = ((IStructuredSelection) s).getFirstElement();
			if( o instanceof IFile
						&& ((IFile) o).getName().toLowerCase().endsWith( ".properties" )) {

				boolean isJavaProject = false;
				try {
					isJavaProject = ((IFile) o).getProject().hasNature( JavaCore.NATURE_ID );
				} catch( CoreException e ) {
					// nothing
				}

				if( isJavaProject ) {
					fine = true;
					this.propertiesFile = (IFile) o;
				}
			}
		}

		super.setBaseEnabled( fine );
	}
}