OpenViewAction.java

package com.javafun.timetracking.ui.action;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.rwt.RWT;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.plugin.AbstractUIPlugin;

import com.javafun.timetracking.model.User;
import com.javafun.timetracking.ui.ICommandIds;

/**
 * When run, this action will open another instance of a view.
 */
public class OpenViewAction extends Action {

    private final IWorkbenchWindow window;
    private int instanceNum = 0;
    private final String viewId;

    public OpenViewAction(IWorkbenchWindow window, String label, String viewId) {
        this.window = window;
        this.viewId = viewId;
        setText(label);
        // The id is used to refer to the action in a menu or toolbar
        setId(ICommandIds.CMD_OPEN);
        // Associate the action with a pre-defined command, to allow key bindings.
        setActionDefinitionId(ICommandIds.CMD_OPEN);
        setImageDescriptor(AbstractUIPlugin.imageDescriptorFromPlugin("com.javafun.core", "/icons/sample2.gif"));
    }

    public void run() {
        if (window != null) {
            try {
                window.getActivePage().showView(viewId, Integer.toString(instanceNum++), IWorkbenchPage.VIEW_ACTIVATE);
            } catch (PartInitException e) {
                MessageDialog.openError(window.getShell(), "Error", "Error opening view:" + e.getMessage());
            }
        }
    }

    @Override
    public boolean isEnabled() {
        User user = (User) RWT.getSessionStore().getHttpSession().getAttribute("user");
        return user != null;
    }
}