org.kalypso.ogc.gml.om.table.handlers.ComponentUiDecimalHandler.java Source code

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Here is the source code for org.kalypso.ogc.gml.om.table.handlers.ComponentUiDecimalHandler.java

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/*----------------    FILE HEADER KALYPSO ------------------------------------------
 *
 *  This file is part of kalypso.
 *  Copyright (C) 2004 by:
 *
 *  Technical University Hamburg-Harburg (TUHH)
 *  Institute of River and coastal engineering
 *  Denickestrae 22
 *  21073 Hamburg, Germany
 *  http://www.tuhh.de/wb
 *
 *  and
 *
 *  Bjoernsen Consulting Engineers (BCE)
 *  Maria Trost 3
 *  56070 Koblenz, Germany
 *  http://www.bjoernsen.de
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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 this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact:
 *
 *  E-Mail:
 *  belger@bjoernsen.de
 *  schlienger@bjoernsen.de
 *  v.doemming@tuhh.de
 *
 *  ---------------------------------------------------------------------------*/
package org.kalypso.ogc.gml.om.table.handlers;

import java.math.BigDecimal;
import java.text.NumberFormat;

import org.apache.commons.lang3.ObjectUtils;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Table;
import org.kalypso.observation.result.IRecord;
import org.kalypso.ogc.gml.table.celleditors.DefaultCellValidators;

/**
 * Handles decimal values (i.e. BigDecimal in java).
 * 
 * @author Dirk Kuch
 * @author Gernot Belger
 */
public class ComponentUiDecimalHandler extends AbstractComponentUiHandler {
    public ComponentUiDecimalHandler(final int component, final boolean editable, final boolean resizeable,
            final boolean moveable, final String columnLabel, final String columnTooltip, final int columnStyle,
            final int columnWidth, final int columnWidthPercent, final String displayFormat,
            final String nullFormat, final String parseFormat) {
        super(component, editable, resizeable, moveable, columnLabel, columnTooltip, columnStyle, columnWidth,
                columnWidthPercent, displayFormat, nullFormat, parseFormat);
    }

    @Override
    public CellEditor createCellEditor(final Table table) {
        final TextCellEditor textCellEditor = new TextCellEditor(table, SWT.NONE);
        textCellEditor.setValidator(DefaultCellValidators.DOUBLE_VALIDATOR);

        return textCellEditor;
    }

    @Override
    public Object doGetValue(final IRecord record) {
        final Object value = record.getValue(getComponent());
        if (value == null)
            return ""; //$NON-NLS-1$

        // TODO: maybe we need an 'editFormat' as well?

        if (value instanceof BigDecimal) {
            // force number of digits to be scale; format with correct locale as well
            final NumberFormat format = NumberFormat.getInstance();
            format.setMinimumFractionDigits(((BigDecimal) value).scale());
            return format.format(value);
        }

        // IMPORTANT: do not use 'getStringRepresentation'; we need to see internal digits here (else just clicking the cell might change the value)
        return String.format("%f", value); //$NON-NLS-1$
    }

    @Override
    public void doSetValue(final IRecord record, final Object value) {
        if (value == null || value instanceof String && ((String) value).length() == 0)
            setValue(record, null);
        else
            setValue(record, parseValue(value.toString()));
    }

    @Override
    public Object parseValue(final String text) {
        return new BigDecimal(text.replace(",", ".")); //$NON-NLS-1$ //$NON-NLS-2$
    }

    @Override
    public void setValue(final IRecord record, final Object value) {
        final int index = getComponent();
        final Object oldValue = record.getValue(index);

        if (!ObjectUtils.equals(value, oldValue))
            record.setValue(getComponent(), value);
    }
}