package com.habuma.restfun;

public class MagicBean {

}

package com.habuma.restfun;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Conditional;

import org.springframework.context.annotation.Configuration;

@Configuration

public class MagicConfig {

  @Bean

  @Conditional(MagicExistsCondition.class)

  public MagicBean magicBean() {

    return new MagicBean();

  }

}

package com.habuma.restfun;

import org.springframework.context.annotation.Condition;

import org.springframework.context.annotation.ConditionContext;

import org.springframework.core.env.Environment;

import org.springframework.core.type.AnnotatedTypeMetadata;

public class MagicExistsCondition implements Condition {

  @Override

  public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {

    Environment env = context.getEnvironment();

    return env.containsProperty("magic");

  }

}

 package com.habuma.restfun;

 import static org.junit.Assert.*;

 import org.junit.Test;

 import org.junit.runner.RunWith;

 import org.springframework.beans.factory.annotation.Autowired;

 import org.springframework.context.ApplicationContext;

 import org.springframework.test.context.ContextConfiguration;

 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

 @RunWith(SpringJUnit4ClassRunner.class)

 @ContextConfiguration(classes=MagicConfig.class)

 public class MagicExistsTest {

   @Autowired

   private ApplicationContext context;

   /*

    * This test will fail until you set a "magic" property.

    * You can set this property as an environment variable, a JVM system property, by adding a @BeforeClass

    * method and calling System.setProperty() or one of several other options.

    */

   @Test

   public void shouldNotBeNull() {

     assertTrue(context.containsBean("magicBean"));

   }

 }

 @Retention(RetentionPolicy.RUNTIME)

 @Target({ElementType.TYPE, ElementType.METHOD})

 @Documented

 @Conditional(ProfileCondition.class)

 public @interface Profile {

     String[] value();

 }

 class ProfileCondition implements Condition {

     public boolean matches(

         ConditionContext context, AnnotatedTypeMetadata metadata) {

         if (context.getEnvironment() != null) {

             MultiValueMap < String, Object > attrs =

                 metadata.getAllAnnotationAttributes(Profile.class.getName());

             if (attrs != null) {

                 for (Object value: attrs.get("value")) {

                     if (context.getEnvironment()

                         .acceptsProfiles(((String[]) value))) {

                         return true;

                     }

                 }

                 return false;

             }

         }

         return true;

     }

 }