ShowFilterView.java

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package edu.rice.cs.hpc.filter.action;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.handlers.HandlerUtil;

import edu.rice.cs.hpc.filter.view.FilterView;

public class ShowFilterView extends AbstractHandler {

    @Override 
    public Object execute(ExecutionEvent event) throws ExecutionException 
    {
        final IWorkbenchPage page = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage();
        if (page != null)
        {
            boolean oldVal = HandlerUtil.toggleCommandState(event.getCommand());
            boolean newVal = !oldVal;
            
            try {
                if (newVal) {
                    page.showView(FilterView.ID);
                } else {
                    final IViewPart part = page.findView(FilterView.ID);
                    page.hideView( part );
                }
            } catch (PartInitException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return null;
    }
}