eu.geclipse.ui.internal.actions.OpenElementAction.java Source code

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Here is the source code for eu.geclipse.ui.internal.actions.OpenElementAction.java

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/*****************************************************************************
 * Copyright (c) 2006, 2007 g-Eclipse Consortium 
 * 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
 *
 * Initial development of the original code was made for the
 * g-Eclipse project founded by European Union
 * project number: FP6-IST-034327  http://www.geclipse.eu/
 *
 * Contributors:
 *    Mathias Stuempert - initial API and implementation
 *****************************************************************************/

package eu.geclipse.ui.internal.actions;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.BaseSelectionListenerAction;

import eu.geclipse.core.model.IGridConnectionElement;
import eu.geclipse.core.model.IGridJob;
import eu.geclipse.core.reporting.ProblemException;
import eu.geclipse.ui.dialogs.ProblemDialog;

/**
 * Action for opening Grid model elements.
 */
public class OpenElementAction extends Action implements ISelectionChangedListener {

    /**
     * Ordinary open file action.
     */
    private OpenFileAction openFileAction;

    /**
     * Specialised action to open Grid jobs.
     */
    private OpenJobAction openJobAction;

    /**
     * The currently active action.
     */
    private BaseSelectionListenerAction activeAction;

    /**
     * Create a new open element action for the specified workbench page.
     * 
     * @param page The {@link IWorkbenchPage} for which to create this
     * action.
     */
    protected OpenElementAction(final IWorkbenchSite site) {

        super(Messages.getString("OpenElementAction.open_element_action_text")); //$NON-NLS-1$

        IWorkbenchPage page = site.getPage();

        this.openFileAction = new OpenFileAction(page);
        this.openJobAction = new OpenJobAction(page);

        ISelectionProvider provider = site.getSelectionProvider();
        if (provider != null) {
            ISelection selection = provider.getSelection();
            if (selection instanceof IStructuredSelection) {
                selectionChanged((IStructuredSelection) selection);
            }
        }

    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.Action#run()
     */
    @Override
    public void run() {
        if (this.activeAction != null) {
            try {
                this.activeAction.run();
            } catch (RuntimeException exc) {
                if (exc.getCause() instanceof ProblemException) {
                    ProblemException problemExc = (ProblemException) exc.getCause();
                    Shell shell = null;
                    IWorkbench workbench = PlatformUI.getWorkbench();
                    IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
                    if (window != null) {
                        shell = window.getShell();
                    }
                    ProblemDialog.openProblem(shell, Messages.getString("OpenElementAction.problemDialogTitle"), //$NON-NLS-1$
                            Messages.getString("OpenElementAction.problemCannotOpen"), //$NON-NLS-1$
                            problemExc);
                } else {
                    throw exc;
                }
            }
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
     */
    public void selectionChanged(final SelectionChangedEvent event) {
        ISelection selection = event.getSelection();
        if (selection instanceof IStructuredSelection) {
            selectionChanged((IStructuredSelection) selection);
        } else {
            selectionChanged(StructuredSelection.EMPTY);
        }
    }

    /**
     * Called whenever the selection of the action's selection provider has changed.
     * 
     * @param selection The new selection.
     */
    public void selectionChanged(final IStructuredSelection selection) {

        this.activeAction = null;

        if (selection != null) {

            if (isGridJob(selection)) {
                this.activeAction = this.openJobAction;
            } else if (!selection.isEmpty()) {
                this.activeAction = this.openFileAction;
            }

            if (this.activeAction != null) {
                this.activeAction.selectionChanged(selection);
                setEnabled(this.activeAction.isEnabled());
            } else {
                setEnabled(false);
            }

        } else {
            setEnabled(false);
        }

    }

    /**
     * Determines if the specified selection is equal to one {@link IGridConnectionElement}.
     * 
     * @param selection The current selection.
     * @return True if the selection contains exactly one {@link IGridConnectionElement}.
     */
    protected boolean isGridConnection(final IStructuredSelection selection) {
        return (selection.size() == 1) && (selection.getFirstElement() instanceof IGridConnectionElement);
    }

    /**
     * Determines if the specified selection is equal to one {@link IGridJob}.
     * 
     * @param selection The current selection.
     * @return True if the selection contains exactly one {@link IGridJob}.
     */
    protected boolean isGridJob(final IStructuredSelection selection) {
        return (selection.size() == 1) && (selection.getFirstElement() instanceof IGridJob);
    }

}