org.kalypso.contribs.eclipse.jface.viewers.CharsetViewer.java Source code

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Here is the source code for org.kalypso.contribs.eclipse.jface.viewers.CharsetViewer.java

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/** This file is part of Kalypso
 *
 *  Copyright (c) 2012 by
 *
 *  Bjrnsen Beratende Ingenieure GmbH, Koblenz, Germany (Bjoernsen Consulting Engineers), http://www.bjoernsen.de
 *  Technische Universitt Hamburg-Harburg, Institut fr Wasserbau, Hamburg, Germany
 *  (Technical University Hamburg-Harburg, Institute of River and Coastal Engineering), http://www.tu-harburg.de/wb/
 *
 *  Kalypso is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License (LGPL) as published by the Free Software
 *  Foundation, either version 3 of the License, or (at your option) any later version.
 *
 *  Kalypso is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with Kalypso.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kalypso.contribs.eclipse.jface.viewers;

import java.nio.charset.Charset;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;

/**
 * Shows the list of available charset to the user.
 *
 * @author Gernot Belger
 */
public class CharsetViewer extends ComboViewer {
    private Charset m_charset;

    /** Charset-Name -> Charset-Label */
    final Map<String, String> m_labelMappings = new HashMap<>();

    public CharsetViewer(final Composite parent) {
        super(parent, SWT.DROP_DOWN | SWT.READ_ONLY);

        setContentProvider(new ArrayContentProvider());
        setLabelProvider(new LabelProvider() {
            @Override
            public String getText(final Object element) {
                final Charset charset = (Charset) element;
                if (m_labelMappings.containsKey(charset.name()))
                    return m_labelMappings.get(charset.name());

                return charset.displayName();
            }
        });

        final SortedMap<String, Charset> availableCharsets = Charset.availableCharsets();
        final Collection<Charset> charsets = availableCharsets.values();
        setInput(charsets);

        addSelectionChangedListener(new ISelectionChangedListener() {
            @Override
            public void selectionChanged(final SelectionChangedEvent event) {
                handleSelectionChanged((IStructuredSelection) event.getSelection());
            }
        });

        final Charset defaultCharset = Charset.defaultCharset();
        final String defaultCharsetLabel = String.format("%s (platform default)", defaultCharset.displayName());
        addLabelMapping(defaultCharset, defaultCharsetLabel);
    }

    public void addLabelMapping(final Charset charset, final String label) {
        m_labelMappings.put(charset.name(), label);
        update(charset, null);
    }

    protected void handleSelectionChanged(final IStructuredSelection selection) {
        m_charset = (Charset) selection.getFirstElement();
    }

    public Charset getCharset() {
        return m_charset;
    }

    public void setCharset(final Charset charset) {
        m_charset = charset;

        setSelection(new StructuredSelection(charset));
    }
}