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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.tuscany.samples.das.customer;
import java.io.InputStream;
import java.util.List;
import org.apache.tuscany.das.rdb.Command;
import org.apache.tuscany.das.rdb.DAS;
import commonj.sdo.DataObject;
public class CustomerClient {
private static final String DEFAULT_CUSTOMER_CONFIG = "CustomersConfig.xml";
private DAS das = null;
private final String configFile;
/**
* Default constructor
*
*/
public CustomerClient(){
this.configFile = DEFAULT_CUSTOMER_CONFIG;
}
/**
* Constructor receiving the das config file to be used
* @param configFile DAS configuration file
*/
public CustomerClient(String configFile) {
this.configFile = configFile;
}
/**
* Helper method to get a stream from the customer config file
* @param fileName
* @return
*/
protected InputStream getConfig(String fileName) {
return getClass().getClassLoader().getResourceAsStream(fileName);
}
/**
* Get a reference to DAS, initialize it if necessary
* @return DAS reference
*/
protected DAS getDAS() {
if (this.das == null ) {
this.das = DAS.FACTORY.createDAS(getConfig(this.configFile));
}
return this.das;
}
/**
* select
* @return
*/
public final List getCustomers() {
Command read = this.getDAS().getCommand("AllCustomers");
DataObject root = read.executeQuery();
return root.getList("CUSTOMER");
}
/**
* insert
*
*/
public final void addCustomer() {
Command read = this.getDAS().getCommand("AllCustomers");
DataObject root = read.executeQuery();
DataObject newCustomer = root.createDataObject("CUSTOMER");
newCustomer.setInt("ID", 5);
newCustomer.setString("LASTNAME", "Jenny");
newCustomer.setString("ADDRESS", "USA");
das.applyChanges(root);
}
/**
* delete
*
*/
public final void deleteCustomer() {
Command readAll = this.getDAS().getCommand("AllCustomers");
DataObject root = readAll.executeQuery();
List allCustomers = root.getList("CUSTOMER");
DataObject lastCustomer = (DataObject)allCustomers.get(allCustomers.size()-1);
if(lastCustomer != null){
System.out.println("Deleting customer named: " + lastCustomer.getString("LASTNAME"));
lastCustomer.delete();
}
das.applyChanges(root);
}
/**
* update
*
*/
public final void changeFirstCustomerName() {
Command readAll = this.getDAS().getCommand("AllCustomers");
DataObject root = readAll.executeQuery();
DataObject firstCustomer = root.getDataObject("CUSTOMER[1]");
firstCustomer.set("LASTNAME", "BlueBerry");
das.applyChanges(root);
}
/**
* display result
* @param customers
*/
public static void printList(List customers){
for(int i=0; i<customers.size(); i++){
System.out.println(" ID:"+(((DataObject)customers.get(i)).getInt("ID"))+
" LASTNAME:"+(((DataObject)customers.get(i)).getString("LASTNAME"))+
" ADDRESS:"+(((DataObject)customers.get(i)).getString("ADDRESS")));
}
}
/**
* cleanup
*
*/
public void releaseResources() {
das.releaseResources();
}
/**
* Main customer application
*/
public static void main(String[] args){
String customerConfigFile = "CustomersConfig.xml"; //this can be from input params too as below
if(args != null && args.length >0){
customerConfigFile = args[0];
}
//initialize customer database using helper class
CustomerDatabaseInitializer dbInitializer = new CustomerDatabaseInitializer(customerConfigFile);
try {
dbInitializer.Initialize();
} catch (Exception e) {
e.printStackTrace();
return;
}
//perform customer operations using DAS
CustomerClient customerClient = new CustomerClient(customerConfigFile);
//test select
System.out.println();
System.out.println("Result:select all customers");
printList(customerClient.getCustomers());
//test insert
System.out.println();
System.out.println("Result:insert new customer");
customerClient.addCustomer();
printList(customerClient.getCustomers());
//test update
System.out.println();
System.out.println("Result:update first customer");
customerClient.changeFirstCustomerName();
printList(customerClient.getCustomers());
//test delete
System.out.println();
System.out.println("Result:delete last customer");
customerClient.deleteCustomer();
printList(customerClient.getCustomers());
}
}
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