Adding new Project : Spring check if a property is null
Using Java Introspector to check if a field is null in an object
This commit is contained in:
Himanshu Mantri
parent
4771dc4a3e
commit
7f80810f53
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@ -37,3 +37,7 @@ spring-all/*.log
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*.jar
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SpringDataInjectionDemo/.mvn/wrapper/maven-wrapper.properties
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spring-call-getters-using-reflection/.mvn/wrapper/maven-wrapper.properties
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spring-check-if-a-property-is-null/.mvn/wrapper/maven-wrapper.properties
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@ -0,0 +1,24 @@
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target/
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!.mvn/wrapper/maven-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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nbproject/private/
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build/
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nbbuild/
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dist/
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nbdist/
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.nb-gradle/
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@ -0,0 +1,50 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>baeldung</groupId>
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<artifactId>spring-check-null</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>spring-check-if-a-property-is-null</name>
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<description>Calling getters using Introspector</description>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.5.3.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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@ -0,0 +1,21 @@
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package com.baeldung;
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import java.util.List;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import com.baeldung.reflection.model.Customer;
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import com.baeldung.reflection.util.Utils;
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@SpringBootApplication
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public class SpringCheckIfAPropertyIsNullApplication {
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public static void main(String[] args) throws Exception {
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Customer customer = new Customer(1, "Himanshu", null, null);
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List<String> nullProps = Utils.getNullPropertiesList(customer);
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System.out.println(nullProps);
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}
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}
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@ -0,0 +1,63 @@
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package com.baeldung.reflection.model;
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/**
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*
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* @author himanshumantri
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*
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*/
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public class Customer {
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private Integer id;
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private String name;
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private String emailId;
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private Long phoneNumber;
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public Integer getId() {
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return id;
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}
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public void setId(Integer id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getEmailId() {
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return emailId;
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}
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public void setEmailId(String emailId) {
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this.emailId = emailId;
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}
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder();
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builder.append("Customer [id=").append(id).append(", name=").append(name).append(", emailId=").append(emailId).append(", phoneNumber=")
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.append(phoneNumber).append("]");
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return builder.toString();
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}
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public Customer(Integer id, String name, String emailId, Long phoneNumber) {
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super();
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this.id = id;
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this.name = name;
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this.emailId = emailId;
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this.phoneNumber = phoneNumber;
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}
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public Long getPhoneNumber() {
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return phoneNumber;
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}
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public void setPhoneNumber(Long phoneNumber) {
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this.phoneNumber = phoneNumber;
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}
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}
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@ -0,0 +1,34 @@
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package com.baeldung.reflection.util;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import com.baeldung.reflection.model.Customer;
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public class Utils {
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public static List<String> getNullPropertiesList(Customer customer) throws Exception {
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PropertyDescriptor[] propDescArr = Introspector.getBeanInfo(Customer.class, Object.class).getPropertyDescriptors();
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List<PropertyDescriptor> propDescList = Arrays.asList(propDescArr);
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List<String> nullProps = new ArrayList<String>();
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propDescList.stream().forEach(p -> {
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Method getterMethod = p.getReadMethod();
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try {
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if (getterMethod != null && getterMethod.invoke(customer) == null) {
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// If the value if null for that field
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nullProps.add(p.getName());
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}
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} catch (Exception e) {
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// Handle the exception
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e.printStackTrace();
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}
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});
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return nullProps;
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}
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}
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@ -0,0 +1,31 @@
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package com.baeldung;
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import java.util.Arrays;
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import java.util.List;
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import org.junit.Assert;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.junit4.SpringRunner;
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import com.baeldung.reflection.model.Customer;
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import com.baeldung.reflection.util.Utils;
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@RunWith(SpringRunner.class)
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@SpringBootTest
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public class SpringCheckIfAPropertyIsNullApplicationTests {
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@Test
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public void givenCustomer_whenAFieldIsNull_thenFieldNameInResult() throws Exception {
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Customer customer = new Customer(1, "Himanshu", null, null);
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List<String> result = Utils.getNullPropertiesList(customer);
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List<String> expectedFieldNames = Arrays.asList("emailId","phoneNumber");
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Assert.assertTrue(result.size() == expectedFieldNames.size());
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Assert.assertTrue(result.containsAll(expectedFieldNames));
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}
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}
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