shoppingcart.java

来自「drools 一个开放源码的规则引擎」· Java 代码 · 共 168 行

package org.drools.examples.petstore;

/*
 * $Id: ShoppingCart.java,v 1.2 2004/09/17 00:37:57 mproctor Exp $
 * 
 * Copyright 2001-2003 (C) The Werken Company. All Rights Reserved.
 * 
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 * 
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * 3. The name "drools" must not be used to endorse or promote products derived
 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
 * 
 * 4. Products derived from this Software may not be called "drools" nor may
 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a trademark of The Werken Company.
 * 
 * 5. Due credit should be given to The Werken Company. (http://werken.com/)
 * 
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *  
 */

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class ShoppingCart
{
    private List          items;

    private double        discount;

    private Map           states;

    private static String newline = System.getProperty( "line.separator" );

    public ShoppingCart()
    {
        states = new HashMap( );
        this.items = new ArrayList( );
        this.discount = 0;
    }

    public boolean getState(String state)
    {
        if ( states.containsKey( state ) )
        {
            return ( ( Boolean ) states.get( state ) ).booleanValue( );
        }
        else
        {
            return false;
        }
    }

    public void setState(String state, boolean value)
    {
        states.put( state, new Boolean( value ) );
    }

    public void setDiscount(double discount)
    {
        this.discount = discount;
    }

    public double getDiscount()
    {
        return this.discount;
    }

    public void addItem(CartItem item)
    {
        this.items.add( item );
    }

    public List getItems()
    {
        return this.items;
    }

    public List getItems(String name)
    {
        ArrayList matching = new ArrayList( );

        Iterator itemIter = getItems( ).iterator( );
        CartItem eachItem = null;

        while ( itemIter.hasNext( ) )
        {
            eachItem = ( CartItem ) itemIter.next( );

            if ( eachItem.getName( ).equals( name ) )
            {
                matching.add( eachItem );
            }
        }

        return matching;
    }

    public double getGrossCost()
    {
        Iterator itemIter = getItems( ).iterator( );
        CartItem eachItem = null;

        double cost = 0.00;

        while ( itemIter.hasNext( ) )
        {
            eachItem = ( CartItem ) itemIter.next( );

            cost += eachItem.getCost( );
        }

        return cost;
    }

    public double getDiscountedCost()
    {
        double cost = getGrossCost( );
        double discount = getDiscount( );

        double discountedCost = cost * ( 1 - discount );

        return discountedCost;
    }

    public String toString()
    {
        StringBuffer buf = new StringBuffer( );

        buf.append( "ShoppingCart:" + newline );

        Iterator itemIter = getItems( ).iterator( );

        while ( itemIter.hasNext( ) )
        {
            buf.append( "\t" + itemIter.next( ) + newline );
        }

        buf.append( "gross total=" + getGrossCost( ) + newline );
        buf.append( "discounted total=" + getDiscountedCost( ) + newline );

        return buf.toString( );
    }
}