# NextHandlingEventPanel.java

    /*
     * Copyright 2011 Marc Grue.
     *
     * Licensed  under the  Apache License,  Version 2.0  (the "License");
     * you may not use  this file  except in  compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed  under the  License is distributed on an "AS IS" BASIS,
     * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
     * implied.
     *
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.qi4j.sample.dcicargo.sample_b.communication.web.tracking;

    import java.text.SimpleDateFormat;
    import org.apache.wicket.AttributeModifier;
    import org.apache.wicket.devutils.stateless.StatelessComponent;
    import org.apache.wicket.markup.html.basic.Label;
    import org.apache.wicket.markup.html.panel.Panel;
    import org.apache.wicket.model.IModel;
    import org.apache.wicket.model.Model;
    import org.apache.wicket.model.StringResourceModel;
    import org.apache.wicket.util.value.ValueMap;
    import org.qi4j.sample.dcicargo.sample_b.communication.query.dto.CargoDTO;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.delivery.NextHandlingEvent;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.handling.HandlingEvent;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.handling.HandlingEventType;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.location.Location;

    /**
     * Next handling event
     *
     * Quite some presentation logic to render 1 line of information!
     */
    @StatelessComponent
    public class NextHandlingEventPanel extends Panel
    {
        public NextHandlingEventPanel( String id, IModel<CargoDTO> cargoModel )
        {
            super( id );

            ValueMap map = new ValueMap();
            Label label = new Label( "text", new StringResourceModel(
                "nextEvent.${nextEvent}", this, new Model<ValueMap>( map ) ) );
            add( label );

            CargoDTO cargo = cargoModel.getObject();
            Location destination = cargo.routeSpecification().get().destination().get();

            if( cargo.itinerary().get() == null )
            {
                map.put( "nextEvent", "ROUTE" );
                return;
            }

            HandlingEvent previousEvent = cargo.delivery().get().lastHandlingEvent().get();
            if( previousEvent == null )
            {
                map.put( "nextEvent", "RECEIVE" );
                map.put( "location", cargo.routeSpecification().get().origin().get().getString() );
                return;
            }

            Location lastLocation = previousEvent.location().get();
            if( previousEvent.handlingEventType().get() == HandlingEventType.CLAIM && lastLocation == destination )
            {
                map.put( "nextEvent", "END_OF_CYCLE" );
                map.put( "location", destination.getString() );
                label.add( new AttributeModifier( "class", "correctColor" ) );
                return;
            }

            NextHandlingEvent nextEvent = cargo.delivery().get().nextHandlingEvent().get();
            if( nextEvent == null )
            {
                map.put( "nextEvent", "UNKNOWN" );
                label.add( new AttributeModifier( "class", "errorColor" ) );
                return;
            }

            map.put( "nextEvent", nextEvent.handlingEventType().get().name() );
            map.put( "location", nextEvent.location().get().getString() );

            if( nextEvent.time() != null )
            {
                map.put( "time", new SimpleDateFormat( "yyyy-MM-dd" ).format( nextEvent.time().get() ) );
            }

            if( nextEvent.voyage().get() != null )
            {
                map.put( "voyage", nextEvent.voyage().get().voyageNumber().get().number().get() );
            }
        }
    }