com.siteview.mde.internal.ui.editor.schema.SchemaPreviewLauncher.java Source code

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Here is the source code for com.siteview.mde.internal.ui.editor.schema.SchemaPreviewLauncher.java

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/*******************************************************************************
 *  Copyright (c) 2007, 2008 IBM Corporation 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
 * 
 *  Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package com.siteview.mde.internal.ui.editor.schema;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.StructuredSelection;
import com.siteview.mde.internal.ui.MDEUIMessages;
import com.siteview.mde.internal.ui.search.PreviewReferenceAction;
import com.siteview.mde.internal.ui.util.PDEModelUtility;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorLauncher;

/**
 * SchemaPreviewLauncher
 *
 */
public class SchemaPreviewLauncher implements IEditorLauncher {

    /* (non-Javadoc)
     * @see org.eclipse.ui.IEditorLauncher#open(org.eclipse.core.runtime.IPath)
     */
    public void open(IPath filePath) {
        // Create the preview action
        PreviewReferenceAction action = new PreviewReferenceAction();
        // Get the file in the workspace which the user right-clicked on and
        // selected "Open With"
        IFile file = ResourcesPlugin.getWorkspace().getRoot().getFileForLocation(filePath);
        // Ensure the file is defined
        if (file == null) {
            // This should never happen
            // Probably workspace out of sync with the file system
            Display.getDefault().beep();
        } else {
            // If an associated schema editor is open and contains unsaved
            // changes, prompt the user first asking whether to save these
            // changes before launching the schema preview
            handleUnsavedOpenSchemaEditor(file);
            // Perform the preview schema action
            // Action parameter not used (unnecessary)
            IAction emptyAction = null;
            // Set data
            action.selectionChanged(emptyAction, new StructuredSelection(file));
            // Run action
            action.run(emptyAction);
        }
    }

    /**
     * @param file
     */
    private void handleUnsavedOpenSchemaEditor(IFile file) {
        // Get the open schema editor with the specified underlying file
        // (if there is any)
        SchemaEditor editor = PDEModelUtility.getOpenSchemaEditor(file);
        // Ensure we have a dirty editor
        if (editor == null) {
            // No matching open editor found
            return;
        } else if (editor.isDirty() == false) {
            // Matching open editor found that is NOT dirty
            return;
        }
        // Matching open editor found that IS dirty
        // Open a dialog asking the user whether they would like to save the
        // editor
        boolean doSave = MessageDialog.openQuestion(Display.getDefault().getActiveShell(),
                MDEUIMessages.SchemaPreviewLauncher_msgEditorHasUnsavedChanges,
                MDEUIMessages.SchemaPreviewLauncher_msgSaveChanges);
        // Save the editor if the user indicated so
        if (doSave) {
            editor.doSave(new NullProgressMonitor());
        }
    }

}