Add new code samples

- Inversion of control
- Constructor injection (using xml and annotations)
- Setter Injection (Using xml and annotations)
- Autowired annotation

Author: aotantawy

code-samples/spring.core/.gitignore

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+/target/

code-samples/spring.core/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com</groupId>
+	<artifactId>spring.core</artifactId>
+	<version>1.0</version>
+	<packaging>jar</packaging>
+
+	<name>spring.core</name>
+	<url>http://maven.apache.org</url>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.target>1.8</maven.compiler.target>
+		<maven.compiler.source>1.8</maven.compiler.source>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>3.8.1</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-context</artifactId>
+			<version>5.2.16.RELEASE</version>
+		</dependency>
+	</dependencies>
+</project>

code-samples/spring.core/src/main/java/applicationContext.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:context="http://www.springframework.org/schema/context"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+    http://www.springframework.org/schema/beans/spring-beans.xsd
+    http://www.springframework.org/schema/context
+    http://www.springframework.org/schema/context/spring-context.xsd">
+
+	<!-- Define beans using annotations -->
+	<context:component-scan
+		base-package="com.example"></context:component-scan>
+
+	<!-- Inversion of control -->
+	<bean id="accountantXml" class="com.example.Accountant"></bean>
+	<bean id="secuirtyGuardXml" class="com.example.SecurityGuard"></bean>
+
+	<!-- Constructor Injection -->
+	<bean id="accountantDepartmentXml"
+		class="com.example.AccountingDepartment"></bean>
+
+	<bean id="accountantConstructorXml" class="com.example.Accountant">
+		<constructor-arg index="0" value="Ahmed Osama Tantawy" />
+		<constructor-arg index="1"
+			ref="accountantDepartmentXml" />
+	</bean>
+
+	<!-- Setter Injection -->
+
+	<bean id="securityDepartmentXml"
+		class="com.example.SecurityDepartment"></bean>
+
+	<bean id="securitySetterXml" class="com.example.SecurityGuard">
+		<property name="employeeName" value="Ahmed Osama Tantawy"></property>
+		<property name="department" ref="securityDepartmentXml"></property>
+	</bean>
+
+
+</beans>

code-samples/spring.core/src/main/java/com/example/Accountant.java

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+package com.example;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component // For defining bean using annotations
+public class Accountant implements Employee {
+	@Value("osos")
+	private String employeeName;
+
+	@Autowired
+	private Department department;
+
+	public Accountant() {
+	}
+
+	public Accountant(String employeeName, Department department) {
+		this.employeeName = employeeName;
+		this.department = department;
+	}
+
+	@Override
+	public String getWorkingHours() {
+		return "Accountant: work from 9 => 5";
+	}
+
+	@Override
+	public String toString() {
+		return "Accountant [employeeName=" + employeeName + ", department=" + department.getDepartmentName() + "]";
+	}
+
+}

code-samples/spring.core/src/main/java/com/example/AccountingDepartment.java

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+package com.example;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+@Component
+@Primary
+public class AccountingDepartment implements Department {
+
+	@Override
+	public String getDepartmentName() {
+		return "Accounting Department";
+	}
+
+}

code-samples/spring.core/src/main/java/com/example/Department.java

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+package com.example;
+
+public interface Department {
+	String getDepartmentName();
+}

code-samples/spring.core/src/main/java/com/example/Employee.java

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+package com.example;
+
+public interface Employee {
+	String getWorkingHours();
+}

code-samples/spring.core/src/main/java/com/example/SecurityDepartment.java

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+package com.example;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class SecurityDepartment implements Department {
+
+	@Override
+	public String getDepartmentName() {
+		return "Security Department";
+	}
+
+}

code-samples/spring.core/src/main/java/com/example/SecurityGuard.java

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+package com.example;
+
+import org.springframework.stereotype.Component;
+
+@Component // for defining beans using annotations
+public class SecurityGuard implements Employee {
+	private String employeeName;
+	private Department department;
+
+	public String getEmployeeName() {
+		return employeeName;
+	}
+
+	public void setEmployeeName(String employeeName) {
+		this.employeeName = employeeName;
+	}
+
+	public Department getDepartment() {
+		return department;
+	}
+
+	public void setDepartment(Department department) {
+		this.department = department;
+	}
+
+	@Override
+	public String getWorkingHours() {
+		return "Security guard: 12am => 7am";
+
+	}
+
+	@Override
+	public String toString() {
+		return "SecurityGuard [employeeName=" + employeeName + ", department=" + department.getDepartmentName() + "]";
+	}
+
+}

code-samples/spring.core/src/main/java/com/spring/AnnotationUsingAutowired.java

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+package com.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.example.Employee;
+
+public class AnnotationUsingAutowired {
+
+	public static void main(String[] args) {
+		ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
+
+		Employee emp = appCtx.getBean("accountant", Employee.class);
+		System.out.println(emp);
+
+		((ClassPathXmlApplicationContext) appCtx).close();
+
+	}
+
+}

code-samples/spring.core/src/main/java/com/spring/ConstructorInjection.java

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+package com.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.example.Employee;
+
+public class ConstructorInjection {
+
+	public static void main(String[] args) {
+		ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
+
+		Employee emp = appCtx.getBean("accountantConstructorXml", Employee.class);
+
+		System.out.println(emp);
+
+		((ClassPathXmlApplicationContext) appCtx).close();
+	}
+
+}

code-samples/spring.core/src/main/java/com/spring/InversionOfControl.java

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+package com.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.example.Employee;
+
+public class InversionOfControl {
+
+	public static void main(String[] args) {
+
+		ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
+
+		Employee emp = appCtx.getBean("accountantXml", Employee.class);
+		// Employee emp = appCtx.getBean("securityGuardXml", Exmployee.class);
+		System.out.println(emp.getWorkingHours());
+
+		((ClassPathXmlApplicationContext) appCtx).close();
+	}
+
+}

code-samples/spring.core/src/main/java/com/spring/SetterInjection.java

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+package com.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import com.example.Employee;
+
+public class SetterInjection {
+
+	public static void main(String[] args) {
+		ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
+
+		Employee emp = appCtx.getBean("securitySetterXml", Employee.class);
+		System.out.println(emp);
+		((ClassPathXmlApplicationContext) appCtx).close();
+	}
+
+}

code-samples/spring.core/src/test/java/com/spring/core/AppTest.java

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+package com.spring.core;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}