org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/CompilationUnitPreview.java

/*******************************************************************************
 * Copyright (c) 2000, 2005 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 org.eclipse.jdt.internal.ui.preferences.formatter;

import java.util.Map;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.formatter.FormattingContextProperties;
import org.eclipse.jface.text.formatter.IContentFormatter;
import org.eclipse.jface.text.formatter.IContentFormatterExtension;
import org.eclipse.jface.text.formatter.IFormattingContext;

import org.eclipse.jdt.internal.ui.IJavaStatusConstants;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.text.comment.CommentFormattingContext;


public class CompilationUnitPreview extends JavaPreview {

    private String fPreviewText;

    /**
     * @param workingValues
     * @param parent
     */
    public CompilationUnitPreview(Map workingValues, Composite parent) {

        super(workingValues, parent);
    }

    protected void doFormatPreview() {
        if (fPreviewText == null) {
            fPreviewDocument.set(""); //$NON-NLS-1$
            return;
        }
        fPreviewDocument.set(fPreviewText);
		
		fSourceViewer.setRedraw(false);
		final IFormattingContext context = new CommentFormattingContext();
		try {
			final IContentFormatter formatter =	fViewerConfiguration.getContentFormatter(fSourceViewer);
			if (formatter instanceof IContentFormatterExtension) {
				final IContentFormatterExtension extension = (IContentFormatterExtension) formatter;
				context.setProperty(FormattingContextProperties.CONTEXT_PREFERENCES, fWorkingValues);
				context.setProperty(FormattingContextProperties.CONTEXT_DOCUMENT, Boolean.valueOf(true));
				extension.format(fPreviewDocument, context);
			} else
				formatter.format(fPreviewDocument, new Region(0, fPreviewDocument.getLength()));
		} catch (Exception e) {
			final IStatus status= new Status(IStatus.ERROR, JavaPlugin.getPluginId(), IJavaStatusConstants.INTERNAL_ERROR, 
				FormatterMessages.JavaPreview_formatter_exception, e); 
			JavaPlugin.log(status);
		} finally {
		    context.dispose();
		    fSourceViewer.setRedraw(true);
		}
    }
    
    public void setPreviewText(String previewText) {
//        if (previewText == null) throw new IllegalArgumentException();
        fPreviewText= previewText;
        update();
    }
}