de.itemis.gmf.tools.popup.actions.GMFToolsAction.java Source code

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Here is the source code for de.itemis.gmf.tools.popup.actions.GMFToolsAction.java

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/*******************************************************************************
 * Copyright (c) 2008 itemis AG (http://www.itemis.eu) and others.
 * 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
 *******************************************************************************/
package de.itemis.gmf.tools.popup.actions;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IActionDelegate;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

import de.itemis.gmf.tools.preferences.GmfModel;
import de.itemis.gmf.tools.preferences.PreferenceUtil;

public abstract class GMFToolsAction implements IObjectActionDelegate {

    protected Shell shell;
    protected List<GmfModel> gmfModels;
    protected String fileExtension;

    /**
     * Constructor for Action1.
     */
    public GMFToolsAction(String fileExtension) {
        super();
        gmfModels = new ArrayList<GmfModel>();
        this.fileExtension = fileExtension;
    }

    /**
     * @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
     */
    public void setActivePart(IAction action, IWorkbenchPart targetPart) {
        shell = targetPart.getSite().getShell();
    }

    /**
     * @see IActionDelegate#selectionChanged(IAction, ISelection)
     */
    public void selectionChanged(IAction action, ISelection selection) {
        if (selection instanceof IStructuredSelection) {
            IStructuredSelection structuredSelection = (IStructuredSelection) selection;
            if (!structuredSelection.isEmpty()) {
                gmfModels.clear();
                List<GmfModel> registeredGmfModels = PreferenceUtil.getGmfModels();
                for (Iterator<?> iter = structuredSelection.iterator(); iter.hasNext();) {
                    Object selectedElement = iter.next();
                    if (selectedElement instanceof IFile) {
                        IFile selectedFile = (IFile) selectedElement;
                        String fileExtension = selectedFile.getFileExtension();
                        if (!this.fileExtension.equals(fileExtension)) {
                            gmfModels.clear();
                            action.setEnabled(false);
                            return;
                        }
                        for (GmfModel registeredGmfModel : registeredGmfModels) {
                            if (registeredGmfModel.hasFile(selectedFile)) {
                                action.setEnabled(true);
                                gmfModels.add(registeredGmfModel);
                                break;
                            }
                        }
                    }
                }
                if (!gmfModels.isEmpty()) {
                    return;
                }
            }
        }
        action.setEnabled(false);
    }

}