Fix some Findbugs findings

[deliverable/tracecompass.git] / org.eclipse.linuxtools.tmf.ui / src / org / eclipse / linuxtools / internal / tmf / ui / project / handlers / CopyTraceHandler.java

/*******************************************************************************
 * Copyright (c) 2011 Ericsson
 * 
 * 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:
 *   Francois Chouinard - Initial API and implementation
 *******************************************************************************/

package org.eclipse.linuxtools.internal.tmf.ui.project.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfTraceElement;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfTraceFolder;
import org.eclipse.linuxtools.tmf.ui.project.wizards.CopyTraceDialog;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

/**
 * <b><u>CopyTraceHandler</u></b>
 * <p>
 */
public class CopyTraceHandler extends AbstractHandler {

    private TmfTraceElement fTrace = null;

    // ------------------------------------------------------------------------
    // Validation
    // ------------------------------------------------------------------------

    @Override
    public boolean isEnabled() {

        // Check if we are closing down
        IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
        if (window == null)
            return false;

        // Get the selection
        IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
        IWorkbenchPart part = page.getActivePart();
        ISelectionProvider selectionProvider = part.getSite().getSelectionProvider();
        if (selectionProvider == null)
            return false;
        ISelection selection = selectionProvider.getSelection();

        // Make sure a trace is selected
        fTrace = null;
        if (selection instanceof TreeSelection) {
            TreeSelection sel = (TreeSelection) selection;
            // There should be only one item selected as per the plugin.xml
            Object element = sel.getFirstElement();
            if (element instanceof TmfTraceElement) {
                fTrace = (TmfTraceElement) element;
            }
        }

        // We only enable opening from the Traces folder for now
        return (fTrace != null && fTrace.getParent() instanceof TmfTraceFolder);
    }

    // ------------------------------------------------------------------------
    // Execution
    // ------------------------------------------------------------------------

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {

        // Check if we are closing down
        IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
        if (window == null)
            return null;

        // Fire the Copy Experiment dialog
        Shell shell = window.getShell();
        CopyTraceDialog dialog = new CopyTraceDialog(shell, fTrace);
        dialog.open();

        return null;
    }

}