MoSyncCommandHandler.java

package com.mobilesorcery.sdk.ui;

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

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

public abstract class MoSyncCommandHandler extends AbstractHandler {

    private static final int ANY = Integer.MIN_VALUE;

    protected IResource extractFirstResource(ISelection selection) {
        return extractFirstResource(selection, ANY);
    }

    protected IResource extractFirstResource(ISelection selection, int type) {
        List<IResource> resources = extractResources(selection, type);
        return resources.isEmpty() ? null : resources.get(0);
	}

    protected List<IResource> extractResources(ISelection selection) {
        return extractResources(selection, ANY);
    }

    protected List<IResource> extractResources(ISelection selection, int type) {
    	if (selection instanceof IStructuredSelection) {
    		List elements = ((IStructuredSelection) selection).toList();
           	return extractResources(elements, type);
    	} else {
    		return new ArrayList<IResource>();
    	}
    }

	private List<IResource> extractResources(List elements, int type) {
		List<IResource> resources = new ArrayList<IResource>();
		for (Object element : elements) {
			if (element instanceof IAdaptable) {
				IResource resource = (IResource) ((IAdaptable) element)
						.getAdapter(IResource.class);
				if (resource != null && (type == ANY || resource.getType() == type)) {
					resources.add(resource);
				}
			}
		}

		return resources;
	}



}