com.mountainminds.eclemma.internal.ui.coverageview.CopyHandler.java Source code

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Here is the source code for com.mountainminds.eclemma.internal.ui.coverageview.CopyHandler.java

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/*******************************************************************************
 * Copyright (c) 2006, 2014 Mountainminds GmbH & Co. KG and Contributors
 * 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:
 *    Marc R. Hoffmann - initial API and implementation
 *    
 ******************************************************************************/
package com.mountainminds.eclemma.internal.ui.coverageview;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.HandlerEvent;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.SWT;
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.swt.widgets.Text;

/**
 * This handler copies a textual representation of the current selection to the
 * clipboard.
 */
class CopyHandler extends AbstractHandler implements ISelectionChangedListener {

    private final ViewSettings settings;
    private final CellTextConverter converter;
    private final Display display;
    private final ISelectionProvider selectionSource;

    public CopyHandler(ViewSettings settings, Display display, ISelectionProvider selectionSource) {
        this.settings = settings;
        this.converter = new CellTextConverter(settings);
        this.display = display;
        this.selectionSource = selectionSource;
        selectionSource.addSelectionChangedListener(this);
    }

    @Override
    public boolean isEnabled() {
        return !selectionSource.getSelection().isEmpty();
    }

    public Object execute(ExecutionEvent event) throws ExecutionException {
        final StringBuilder sb = new StringBuilder();

        // Header
        final String[] headers = settings.getColumnHeaders();
        sb.append(headers[CoverageView.COLUMN_ELEMENT]).append(SWT.TAB);
        sb.append(headers[CoverageView.COLUMN_RATIO]).append(SWT.TAB);
        sb.append(headers[CoverageView.COLUMN_COVERED]).append(SWT.TAB);
        sb.append(headers[CoverageView.COLUMN_MISSED]).append(SWT.TAB);
        sb.append(headers[CoverageView.COLUMN_TOTAL]).append(Text.DELIMITER);

        // Rows:
        final IStructuredSelection selection = (IStructuredSelection) selectionSource.getSelection();
        for (final Object element : selection.toList()) {
            sb.append(converter.getElementName(element)).append(SWT.TAB);
            sb.append(converter.getRatio(element)).append(SWT.TAB);
            sb.append(converter.getCovered(element)).append(SWT.TAB);
            sb.append(converter.getMissed(element)).append(SWT.TAB);
            sb.append(converter.getTotal(element)).append(Text.DELIMITER);
        }

        copy(sb.toString());
        return null;
    }

    private void copy(String text) {
        final Clipboard cb = new Clipboard(display);
        final TextTransfer transfer = TextTransfer.getInstance();
        cb.setContents(new Object[] { text }, new Transfer[] { transfer });
        cb.dispose();
    }

    @Override
    public void dispose() {
        selectionSource.removeSelectionChangedListener(this);
    }

    public void selectionChanged(SelectionChangedEvent event) {
        fireHandlerChanged(new HandlerEvent(this, true, false));
    }

}