org.kalypso.zml.core.base.request.MetadataRequestHandler.java Source code

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Here is the source code for org.kalypso.zml.core.base.request.MetadataRequestHandler.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.zml.core.base.request;

import java.util.Calendar;
import java.util.Date;

import javax.xml.bind.DatatypeConverter;

import jregex.Pattern;
import jregex.RETokenizer;

import org.apache.commons.lang3.StringUtils;
import org.kalypso.ogc.sensor.DateRange;
import org.kalypso.ogc.sensor.metadata.MetadataList;
import org.kalypso.ogc.sensor.request.IRequest;
import org.kalypso.ogc.sensor.request.ObservationRequest;

import de.openali.odysseus.chart.framework.model.layer.IParameterContainer;

/**
 * @author Dirk Kuch
 */
public class MetadataRequestHandler implements IRequestHandler {
    private static final Pattern PATTERN_METADATA_DATE = new Pattern("^metadata\\:"); //$NON-NLS-1$

    private final IParameterContainer m_parameters;

    public MetadataRequestHandler(final IParameterContainer parameters) {
        m_parameters = parameters;
    }

    @Override
    public IRequest getArguments(final MetadataList metadata) {
        Date from = null;
        Date to = null;

        final String keyStart = getKey("start"); //$NON-NLS-1$
        final String keyEnd = getKey("end"); //$NON-NLS-1$

        if (keyStart != null)
            from = getDate(metadata, keyStart);

        if (keyEnd != null)
            to = getDate(metadata, keyEnd);

        return new ObservationRequest(new DateRange(from, to));
    }

    private Date getDate(final MetadataList metadata, final String key) {
        if (key.startsWith("metadata:"))//$NON-NLS-1$
        {
            return getFromMetadata(metadata, key);
        }

        return null;
    }

    private Date getFromMetadata(final MetadataList metadata, final String url) {
        final RETokenizer tokenizer = new RETokenizer(PATTERN_METADATA_DATE, url);

        final String key = tokenizer.nextToken();

        final String property = metadata.getProperty(key);
        if (StringUtils.isEmpty(property))
            return null;

        final Calendar calendar = DatatypeConverter.parseDate(property);

        return calendar.getTime();
    }

    private String getKey(final String key) {
        return m_parameters.getParameterValue(key, null);
    }

}