tutorials/cargo/src/main/java/org/apache/zest/tutorials/cargo/step1/internal/ShippingServiceImpl.java

/*
 * Copyright 2007, 2008 Niclas Hedhman.
 *
 * 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.apache.zest.tutorials.cargo.step1.internal;

import org.apache.zest.tutorials.cargo.step1.BookingPolicy;
import org.apache.zest.tutorials.cargo.step1.Cargo;
import org.apache.zest.tutorials.cargo.step1.ShippingService;
import org.apache.zest.tutorials.cargo.step1.Voyage;

public class ShippingServiceImpl
    implements ShippingService
{
    private BookingPolicy bookingPolicy;
    private SimpleSequenceImpl orderConfirmationSequence;

    public ShippingServiceImpl( BookingPolicy bookingPolicy )
    {
        this.bookingPolicy = bookingPolicy;
        orderConfirmationSequence = new SimpleSequenceImpl();
    }

    @Override
    public int makeBooking( Cargo cargo, Voyage voyage )
    {
        if( !bookingPolicy.isAllowed( cargo, voyage ) )
        {
            return -1;
        }
        int confirmation = orderConfirmationSequence.next();
        if( voyage instanceof VoyageImpl )
        {
            ( (VoyageImpl) voyage ).addCargo( cargo, confirmation );
        }
        else
        {
            return -1;
        }
        return confirmation;
    }
}