org.kalypso.commons.databinding.validation.StringToUrlValidator.java Source code

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Here is the source code for org.kalypso.commons.databinding.validation.StringToUrlValidator.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.commons.databinding.validation;

import java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.core.databinding.validation.ValidationStatus;
import org.eclipse.core.runtime.IStatus;
import org.kalypso.commons.internal.i18n.Messages;

/**
 * @author Gernot Belger
 */
public class StringToUrlValidator extends TypedValidator<String> {
    private final String m_fieldName;

    public StringToUrlValidator(final String fieldName) {
        super(String.class, IStatus.ERROR, StringUtils.EMPTY);

        m_fieldName = fieldName;
    }

    @Override
    protected IStatus doValidate(final String value) {
        if (StringUtils.isEmpty(value))
            return ValidationStatus.error(String.format(Messages.getString("StringToUrlValidator_0"), m_fieldName)); //$NON-NLS-1$

        try {
            final URL url = new URL(value);
            final String host = url.getHost();
            if (StringUtils.isBlank(host))
                return ValidationStatus
                        .error(String.format(Messages.getString("StringToUrlValidator_1"), m_fieldName)); //$NON-NLS-1$
        } catch (final MalformedURLException e) {
            // REMARK: we do not give the exception here, else the console gets cluttered with the stack traces when the user
            // enters a url
            return ValidationStatus.error(e.getLocalizedMessage(), null);
        }

        return ValidationStatus.ok();
    }

}