OpenAction.java :  » Byte-Code » asm » de » loskutov » bco » ui » actions » Java Open Source

/*****************************************************************************************
 * Copyright (c) 2004 Andrei Loskutov. All rights reserved. This program and the
 * accompanying materials are made available under the terms of the BSD License which
 * accompanies this distribution, and is available at
 * http://www.opensource.org/licenses/bsd-license.php Contributor: Andrei Loskutov -
 * initial API and implementation
 ****************************************************************************************/
package de.loskutov.bco.ui.actions;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.dialogs.ResourceListSelectionDialog;

import de.loskutov.bco.BytecodeOutlinePlugin;

/**
 * @author Andrei
 */
public class OpenAction extends BytecodeAction implements IObjectActionDelegate {

    /**
     * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
     */
    public void run(IAction action) {
        // always only one element!
        IJavaElement[] resources = getSelectedResources();

        // select one from input dialog
        IJavaElement element2 = selectJavaElement();
        if (element2 == null) {
            return;
        }
        try {
            exec(resources[0], element2);
        } catch (Exception e) {
            BytecodeOutlinePlugin.error("Failed to run Compare: "
                + e.getMessage(), e);
        }
    }

    private IJavaElement selectJavaElement() {
        IContainer input = ResourcesPlugin.getWorkspace().getRoot();

        OpenClassFileDialog dialog = new OpenClassFileDialog(
            shell, input, IResource.FILE);

        int resultCode = dialog.open();
        if (resultCode != IDialogConstants.OK_ID) {
            return null;
        }

        Object[] result = dialog.getResult();
        if (result == null || result.length == 0
            || !(result[0] instanceof IFile)) {
            return null;
        }
        return JavaCore.create((IFile) result[0]);
    }

    /**
     * @author Andrei
     */
    private static final class OpenClassFileDialog extends ResourceListSelectionDialog {

        /**
         * @param parentShell
         * @param container
         * @param typesMask
         */
        public OpenClassFileDialog(Shell parentShell, IContainer container,
            int typesMask) {
            super(parentShell, container, typesMask);
            setTitle("Bytecode compare");
            setMessage("Please select class file to compare");
        }

        /**
         * Extends the super's filter to exclude derived resources.
         * @since 3.0
         */
        protected boolean select(IResource resource) {
            if (resource == null) {
                return false;
            }
            String fileExtension = resource.getFileExtension();
            return super.select(resource)
                && ("java".equals(fileExtension) || "class"
                    .equals(fileExtension));
        }
    }

}