ch.unibe.iam.scg.archie.commands.CopySelected.java Source code

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Here is the source code for ch.unibe.iam.scg.archie.commands.CopySelected.java

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/*******************************************************************************
 * Copyright (c) 2008 Dennis Schenk, Peter Siska.
 * 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:
 *     Dennis Schenk - initial implementation
 *     Peter Siska    - initial implementation
 *******************************************************************************/
package ch.unibe.iam.scg.archie.commands;

import java.util.Iterator;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;

import ch.unibe.iam.scg.archie.ui.views.StatisticsView;

/**
 * <p>
 * This handler copies selected items coming from a selection provider into the
 * system's clipboard. The selection has to be of type
 * <code>IStructuredSelection</code>, this way we can assume the data is coming
 * from a table, most likely one that has been built from a provider's dataset.
 * </p>
 * 
 * $Id: CopySelected.java 672 2008-12-15 10:53:14Z hephster $
 * 
 * @author Peter Siska
 * @author Dennis Schenk
 * @version $Rev: 672 $
 */
public class CopySelected extends AbstractHandler {

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public Object execute(ExecutionEvent event) throws ExecutionException {
        IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindow(event);
        IWorkbenchPage page = window.getActivePage();
        IViewPart view = (IViewPart) page.findView(StatisticsView.ID);
        ISelection selection = view.getSite().getSelectionProvider().getSelection();
        if (selection == null)
            return null;

        // build selection string
        StringBuilder builder = new StringBuilder();
        if (selection instanceof IStructuredSelection) {
            IStructuredSelection strucSelection = (IStructuredSelection) selection;
            for (Iterator<Object> iterator = strucSelection.iterator(); iterator.hasNext();) {
                Comparable<?>[] row = (Comparable<?>[]) iterator.next();
                builder.append(this.datasetRowToString(row));
            }
        }

        // create clipboard contents
        Clipboard clipboard = new Clipboard(Display.getDefault());
        TextTransfer transfer = TextTransfer.getInstance();
        clipboard.setContents(new Object[] { builder.toString() }, new Transfer[] { transfer });

        return null;
    }

    /**
     * Composes a string from a dataset row that resides in a table.
     * 
     * @param row
     *            Array of <code>Comparable</code> objects.
     * @return String composed from the array fields, separated by
     *         <code>\t</code>
     */
    private String datasetRowToString(Comparable<?>[] row) {
        String rowString = "";
        for (int i = 0; i < row.length; i++) {
            rowString += row[i].toString();
            rowString += (i == row.length - 1) ? "" : "\t";
        }
        rowString += System.getProperty("line.separator");
        return rowString;
    }
}