Implementing a Demo BOL (SAP Library

Implementing a Demo BOL

To fill the two tables CustomerTable and OrderTable with example data at runtime, you simply implement individual auxiliary classes as a representation of a demo business object layers, in accordance with the following graphic:

This graphic is explained in the accompanying text

After you instantiate and initialize the class SomeBOL, the records to be displayed in the customer and order tables can be accessed in the view controller using the methods getCustomers() and getOrdersForCustomer(String customerName).

Procedure

...

1. In the directory src/packages/<component-package-folder> (that is, src/packages/com.sap.tc.webdynpro.tutorials.masterdetail in our example), add a new subdirectory called bol.

2. Save the following Java class, called SomeBOL.java, in this subdirectory. The classes Customer, Address and Order are included in this class as inner classes.

The class SomeBOL.java

package com.sap.tc.webdynpro.tutorials.masterdetail.bol;

import java.util.*;

/**

* Demo Business Object Layer class used in Web Dynpro Tutorial Master-Detail-Viewer

public class SomeBOL {

// ##### Inner Class for Business Objects of Type Customer ##############

public class Customer {

// ---- fields

private String name;

private Address address;

private List orders;

/** Constructors for Customer */

public Customer(String name, Address address, List orders) {

this.name = name;

this.address = address;

this.orders = orders;

}

// ====================== Getter Methods ========================

public Address getAddress() {

return address;

}

public String getName() {

return name;

}

public List getOrders() {

return orders;

}

// ####### Inner Class for Business Objects of Type Address #######

public class Address {

// ---- fields

private String street;

private String houseNo;

private String city;

private String postalCode;

private String country;

/** Constructor for Address */

public Address(

// ---- fields

String street,

String houseNo,

String city,

String postalCode,

String country) {

this.street = street;

this.houseNo = houseNo;

this.city = city;

this.postalCode = postalCode;

this.country = country;

}

// ====================== Accessor-Methods ========================

public String getCity() {

return city;

}

public String getCountry() {

return country;

}

public String getHouseNo() {

return houseNo;

}

public String getPostalCode() {

return postalCode;

}

public String getStreet() {

return street;

}

// ####### Inner Class for Business Objects of Type Order ########

public class Order {

// ---- fields

private String date;

private String product;

private String price;

private String currency;

/** Constructor for Order */

public Order(String date, String product, String price, String currency) {

this.date = date;

this.currency = currency;

this.price = price;

this.product = product;

}

// ====================== Getter Methods ========================

public String getDate() {

return date;

}

public String getPrice() {

return price;

}

public String getProduct() {

return product;

}

public String getCurrency() {

return currency;

}

// ------------------------ end of inner classes ---------------------------

private Map customers;

/** Constructor for SomeBOL */

public SomeBOL() {

this.customers = Collections.EMPTY_MAP;

}

public void initialize() {

List orderList;

customers = new HashMap();

orderList = new ArrayList();

orderList.add(new Order("12.10.2001", "Table", "120", "Pound"));

orderList.add(new Order("23.05.2001", "Chair", "80", "Pound"));

orderList.add(new Order("04.01.2000", "Desk", "200", "Pound"));

orderList.add(new Order("17.07.2000", "Lamp", "70.5", "Pound"));

customers.put(

"Miller",

new Customer(

"Miller",

new Address("Tabernacle Street", "10", "London", "EC2", "England"),

orderList));

orderList = new ArrayList();

orderList.add(new Order("13.10.1999", "Table Noire", "120", "Euro"));

orderList.add(new Order("23.05.2001", "Green Lamp", "80", "Euro"));

orderList.add(new Order("04.01.2000", "Desk", "200", "Euro"));

orderList.add(new Order("17.07.2000", "Lamp", "70.5", "Euro"));

orderList.add(new Order("21.07.2002", "Wall Closet", "500", "Euro"));

customers.put(

"Schmidt",

new Customer(

"Schmidt",

new Address("Bahnhofstraße", "127", "Berlin", "10407", "Germany"),

orderList));

orderList = new ArrayList();

orderList.add(new Order("13.10.1997", "Floor Lamp", "180", "Dollar"));

orderList.add(new Order("23.05.2001", "Commode", "300", "Dollar"));

orderList.add(new Order("08.01.2002", "Rack", "199", "Dollar"));

orderList.add(new Order("17.08.1998", "Lamp (Halogene)", "100", "Dollar"));

orderList.add(new Order("11.10.1997", "Davenport", "219", "Dollar"));

customers.put(

"Smith",

new Customer(

"Smith",

new Address(

"Square Garden",

"215 West 34th Street",

"New York",

"10102",

"USA"),

orderList));

}

public Collection getCustomers() {

return customers.values();

}

public Collection getOrdersForCustomer(String customerName) {

return ((Customer)customers.get(customerName)).getOrders();

}

In the next topic, we will use an object of the class SomeBOL to fill the context structure in the view controller with data.

This graphic is explained in the accompanying text You can now initialize the context structure in the controller implementation of the view using the class SomeBOL.