NativeProjectBuilderContentProvider.java

/*******************************************************************************
 * Copyright (c) 2013, 2014 Red Hat, Inc. 
 * 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:
 * 		 Red Hat Inc. - initial API and implementation and/or initial documentation
 *******************************************************************************/
package org.eclipse.thym.ui.wizard.export;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.thym.core.HybridCore;
import org.eclipse.thym.core.extensions.NativeProjectBuilder;
import org.eclipse.thym.ui.HybridUI;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.services.IEvaluationService;

public class NativeProjectBuilderContentProvider implements
		IStructuredContentProvider {
	private List<NativeProjectBuilder> builders;
	
	@Override
	public void dispose() {
	}

	@SuppressWarnings("unchecked")
	@Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		try{
			builders = (List<NativeProjectBuilder>) newInput;
		}catch(ClassCastException e){
			Assert.isTrue(false, "new input is correct type this conent provider works only with List<NativeProjectBuilder>");
		}
	}

	@Override
	public Object[] getElements(Object inputElement) {
		if(builders == null ){
			builders = HybridCore.getNativeProjectBuilders();
		}
		ArrayList<NativeProjectBuilder> elements = new ArrayList<NativeProjectBuilder>();
		IEvaluationService service = (IEvaluationService)PlatformUI.getWorkbench().getService(IEvaluationService.class);
		for (NativeProjectBuilder builder : builders) {
			try {
				if(builder.isEnabled(service.getCurrentState())){
					elements.add(builder);
				}
				
			} catch (CoreException e) {
				HybridUI.log(IStatus.ERROR, "Error filtering objects", e);
			}
		}
	
		
		return elements.toArray();
	}

}