org.eclipse.recommenders.utils.rcp.RCPUtils.java Source code

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Here is the source code for org.eclipse.recommenders.utils.rcp.RCPUtils.java

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/**
 * Copyright (c) 2010, 2011 Darmstadt University of Technology.
 * 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:
 */
package org.eclipse.recommenders.utils.rcp;

import static com.google.common.base.Optional.absent;
import static com.google.common.base.Optional.of;

import java.util.List;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.StyledString.Styler;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.TextStyle;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

import com.google.common.base.Optional;

public class RCPUtils {
    public static IStructuredSelection asStructuredSelection(final ISelection selection) {
        return (IStructuredSelection) (isStructured(selection) ? selection : StructuredSelection.EMPTY);
    }

    public static boolean isStructured(final ISelection selection) {
        return selection instanceof IStructuredSelection;
    }

    public static <T> List<T> toList(final ISelection selection) {
        return asStructuredSelection(selection).toList();
    }

    public static <T> T unsafeFirstElement(final ISelection s) {
        return (T) asStructuredSelection(s).getFirstElement();
    }

    public static <T> Optional<T> safeFirstElement(final ISelection s, final Class<T> type) {
        final Object element = asStructuredSelection(s).getFirstElement();
        return (Optional<T>) (type.isInstance(element) ? of(element) : absent());
    }

    public static <T> Optional<T> first(final ISelection s) {
        final T element = unsafeFirstElement(s);
        return Optional.fromNullable(element);
    }

    public static Optional<IWorkbenchPage> getActiveWorkbenchPage() {
        final IWorkbench workbench = PlatformUI.getWorkbench();
        if (workbench == null) {
            return absent();
        }
        final IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
        if (window == null) {
            return absent();
        }
        final IWorkbenchPage page = window.getActivePage();
        return of(page);
    }

    public static StyledString deepCopy(final StyledString displayString) {
        final StyledString copy = new StyledString(displayString.getString());
        for (final StyleRange range : displayString.getStyleRanges()) {
            copy.setStyle(range.start, range.length, new Styler() {

                @Override
                public void applyStyles(final TextStyle textStyle) {
                    textStyle.background = range.background;
                    textStyle.borderColor = range.borderColor;
                    textStyle.borderStyle = range.borderStyle;
                    textStyle.font = range.font;
                    textStyle.foreground = range.foreground;
                }
            });
        }
        return copy;
    }
}