Fix some Findbugs findings

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

/*******************************************************************************
 * Copyright (c) 2009, 2010, 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 java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

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.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.linuxtools.internal.tmf.ui.Activator;
import org.eclipse.linuxtools.tmf.ui.project.model.ITmfProjectModelElement;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfExperimentElement;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfExperimentFolder;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfTraceElement;
import org.eclipse.linuxtools.tmf.ui.project.model.TmfTraceFolder;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorReference;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;

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

    private TreeSelection fSelection = 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 selection contains only traces
        fSelection = null;
        if (selection instanceof TreeSelection) {
            fSelection = (TreeSelection) selection;
            Iterator<Object> iterator = fSelection.iterator();
            while (iterator.hasNext()) {
                Object element = iterator.next();
                if (!(element instanceof TmfTraceElement)) {
                    return false;
                }
            }
        }

        // If we get here, either nothing is selected or everything is a trace
        return !selection.isEmpty();
    }

    // ------------------------------------------------------------------------
    // 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;
        }

        // Confirm the operation
        Shell shell = window.getShell();
        MessageBox confirmOperation = new MessageBox(shell, SWT.ICON_QUESTION | SWT.CANCEL | SWT.OK);
        confirmOperation.setText(Messages.DeleteDialog_Title);
        confirmOperation.setMessage(Messages.DeleteTraceHandler_Message);
        if (confirmOperation.open() != SWT.OK) {
            return null;
        }

        Iterator<Object> iterator = fSelection.iterator();
        while (iterator.hasNext()) {
            Object element = iterator.next();
            if (element instanceof TmfTraceElement) {
                final TmfTraceElement trace = (TmfTraceElement) element;
                IResource resource = trace.getResource();
                try {
                    // Close the trace if open
                    IFile file = trace.getBookmarksFile();
                    FileEditorInput input = new FileEditorInput(file);
                    IWorkbench wb = PlatformUI.getWorkbench();
                    for (IWorkbenchWindow wbWindow : wb.getWorkbenchWindows()) {
                        for (IWorkbenchPage wbPage : wbWindow.getPages()) {
                            for (IEditorReference editorReference : wbPage.getEditorReferences()) {
                                if (editorReference.getEditorInput().equals(input)) {
                                    wbPage.closeEditor(editorReference.getEditor(false), false);
                                }
                            }
                        }
                    }

                    IPath path = resource.getLocation();
                    if (path != null && (trace.getParent() instanceof TmfTraceFolder)) {
                        TmfExperimentFolder experimentFolder = trace.getProject().getExperimentsFolder();

                        // Propagate the removal to traces
                        for (ITmfProjectModelElement experiment : experimentFolder.getChildren()) {
                            List<ITmfProjectModelElement> toRemove = new LinkedList<ITmfProjectModelElement>();
                            for (ITmfProjectModelElement child : experiment.getChildren()) {
                                if (child.getName().equals(trace.getName())) {
                                    toRemove.add(child);
                                }
                            }
                            for (ITmfProjectModelElement child : toRemove) {
                                // Close the experiment if open
                                file = ((TmfExperimentElement) experiment).getBookmarksFile();
                                input = new FileEditorInput(file);
                                for (IWorkbenchWindow wbWindow : wb.getWorkbenchWindows()) {
                                    for (IWorkbenchPage wbPage : wbWindow.getPages()) {
                                        for (IEditorReference editorReference : wbPage.getEditorReferences()) {
                                            if (editorReference.getEditorInput().equals(input)) {
                                                wbPage.closeEditor(editorReference.getEditor(false), false);
                                            }
                                        }
                                    }
                                }
                                experiment.removeChild(child);
                                child.getResource().delete(true, null);
                            }
                        }

                        // Delete supplementary files
                        trace.deleteSupplementaryFolder();
                    }

                    // Finally, delete the trace
                    resource.delete(true, new NullProgressMonitor());

                    // Refresh the project
                    trace.getProject().refresh();

                } catch (final CoreException e) {
                    Display.getDefault().asyncExec(new Runnable() {
                        @Override
                        public void run() {
                            final MessageBox mb = new MessageBox(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell());
                            mb.setText(Messages.DeleteTraceHandler_Error + ' ' + trace.getName());
                            mb.setMessage(e.getMessage());
                            mb.open();
                        }
                    });
                    Activator.getDefault().logError("Error deleting trace: " + trace.getName(), e); //$NON-NLS-1$
                }
            }
        }

        return null;
    }
}