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#348 - Data Tranfer Object : Implement Data Transfer Object pattern simple version.

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Gopinath Langote 2017-08-11 15:42:21 +05:30
parent 67d4477d25
commit 148de06bb1
3 changed files with 204 additions and 0 deletions
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60
data-transfer-object/src/main/java/com/iluwatar/datatransfer/CustomerDto.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017 Gopinath Langote
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.iluwatar.datatransfer;
/**
* {@link CustomerDto} is a data transfer object POJO. Instead of sending individual information to client
* We can send related information together in POJO.
* <p>
* Dto will not have any business logic in it.
*/
public class CustomerDto {
private String id;
private String firstName;
private String lastName;
/**
* @param id customer id
* @param firstName customer first name
* @param lastName customer last name
*/
public CustomerDto(String id, String firstName, String lastName) {
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}
public String getId() {
return id;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
}

63
data-transfer-object/src/main/java/com/iluwatar/datatransfer/CustomerResource.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017 Gopinath Langote
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.iluwatar.datatransfer;
import java.util.List;
/**
* The resource class which serves customer information.
* This class act as server in the demo. Which has all customer details.
*/
public class CustomerResource {
private List<CustomerDto> customers;
/**
* @param customers initialize resource with existing customers. Act as database.
*/
public CustomerResource(List<CustomerDto> customers) {
this.customers = customers;
}
/**
* @return : all customers in list.
*/
public List<CustomerDto> getAllCustomers() {
return customers;
}
/**
* @param customer save new customer to list.
*/
public void save(CustomerDto customer) {
customers.add(customer);
}
/**
* @param customerId delete customer with id {@code customerId}
*/
public void delete(String customerId) {
customers.removeIf(customer -> customer.getId().equals(customerId));
}
}

81
data-transfer-object/src/test/java/com/iluwatar/datatransfer/CustomerResourceTest.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017 Gopinath Langote
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.iluwatar.datatransfer;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertEquals;
/**
* tests {@link CustomerResource}.
*/
public class CustomerResourceTest {
@Test
public void shouldGetAllCustomers() {
CustomerDto customer = new CustomerDto("1", "David", "Roy");
List<CustomerDto> customers = new ArrayList<>();
customers.add(customer);
CustomerResource customerResource = new CustomerResource(customers);
List<CustomerDto> allCustomers = customerResource.getAllCustomers();
assertEquals(allCustomers.size(), 1);
assertEquals(allCustomers.get(0).getId(), "1");
assertEquals(allCustomers.get(0).getFirstName(), "David");
assertEquals(allCustomers.get(0).getLastName(), "Roy");
}
@Test
public void shouldSaveCustomer() {
CustomerDto customer = new CustomerDto("1", "David", "Roy");
CustomerResource customerResource = new CustomerResource(new ArrayList<>());
customerResource.save(customer);
List<CustomerDto> allCustomers = customerResource.getAllCustomers();
assertEquals(allCustomers.get(0).getId(), "1");
assertEquals(allCustomers.get(0).getFirstName(), "David");
assertEquals(allCustomers.get(0).getLastName(), "Roy");
}
@Test
public void shouldDeleteCustomer() {
CustomerDto customer = new CustomerDto("1", "David", "Roy");
List<CustomerDto> customers = new ArrayList<>();
customers.add(customer);
CustomerResource customerResource = new CustomerResource(customers);
customerResource.delete(customer.getId());
List<CustomerDto> allCustomers = customerResource.getAllCustomers();
assertEquals(allCustomers.size(), 0);
}
}